Merge pull request #8074 from filecoin-project/jen/v15rc1

feat: build: v1.15.0-rc1
add changelog
2022-02-11 00:12:18 -05:00 · 2022-02-10 23:56:42 -05:00 · 2022-02-10 23:38:41 -05:00 · 2022-02-10 11:06:01 +00:00 · 2022-02-09 19:31:50 -05:00 · 2022-02-09 19:27:34 -05:00
75 changed files with 2935 additions and 481 deletions
@@ -44,13 +44,13 @@ commands:
      - restore_cache:
          name: Restore parameters cache
          keys:
-            - 'v25-2k-lotus-params'
+            - 'v26-2k-lotus-params'
          paths:
            - /var/tmp/filecoin-proof-parameters/
      - run:  ./lotus fetch-params 2048
      - save_cache:
          name: Save parameters cache
-          key: 'v25-2k-lotus-params'
+          key: 'v26-2k-lotus-params'
          paths:
            - /var/tmp/filecoin-proof-parameters/
  install_ipfs:
@@ -44,13 +44,13 @@ commands:
      - restore_cache:
          name: Restore parameters cache
          keys:
-            - 'v25-2k-lotus-params'
+            - 'v26-2k-lotus-params'
          paths:
            - /var/tmp/filecoin-proof-parameters/
      - run:  ./lotus fetch-params 2048
      - save_cache:
          name: Save parameters cache
-          key: 'v25-2k-lotus-params'
+          key: 'v26-2k-lotus-params'
          paths:
            - /var/tmp/filecoin-proof-parameters/
  install_ipfs:
@@ -1,4 +1,178 @@
 # Lotus changelog
+# 1.15.0-rc1 / 2022-02-10
+
+This is the first release candidates of v1.15.0, detailed changelog will be updated later.
+
+- github.com/filecoin-project/lotus:
+  - bump the version to v1.15.0-rc1
+  - chore: build: v1.14.0 -> master ([filecoin-project/lotus#8053](https://github.com/filecoin-project/lotus/pull/8053))
+  - FinalizeReplicaUpdate ([filecoin-project/lotus#8018](https://github.com/filecoin-project/lotus/pull/8018))
+  - splitstore sortless compaction ([filecoin-project/lotus#8008](https://github.com/filecoin-project/lotus/pull/8008))
+  - perf: chain: Make drand logs in daemon less noisy (#7955) ([filecoin-project/lotus#7955](https://github.com/filecoin-project/lotus/pull/7955))
+  - chore: shed: storage stats 2.0 ([filecoin-project/lotus#7941](https://github.com/filecoin-project/lotus/pull/7941))
+  - StartEpochSealingBuffer triggers packing on timer ([filecoin-project/lotus#7905](https://github.com/filecoin-project/lotus/pull/7905))
+  - deps: update go-paramfetch to v0.0.4 ([filecoin-project/lotus#8050](https://github.com/filecoin-project/lotus/pull/8050))
+  - fix: sealing: Stop recovery attempts after fault ([filecoin-project/lotus#8014](https://github.com/filecoin-project/lotus/pull/8014))
+  - chore: update build and deps ([filecoin-project/lotus#8047](https://github.com/filecoin-project/lotus/pull/8047))
+  - update libp2p to v0.18.0-rc4 ([filecoin-project/lotus#8044](https://github.com/filecoin-project/lotus/pull/8044))
+  - update go-libp2p to v0.18.0-rc3 ([filecoin-project/lotus#8022](https://github.com/filecoin-project/lotus/pull/8022))
+  - misc: api: Annotate lotus tests according to listed behaviors ([filecoin-project/lotus#7835](https://github.com/filecoin-project/lotus/pull/7835))
+  - some basic splitstore refactors ([filecoin-project/lotus#7999](https://github.com/filecoin-project/lotus/pull/7999))
+  - feat: mpool: Cache state nonces ([filecoin-project/lotus#8005](https://github.com/filecoin-project/lotus/pull/8005))
+  - chore: sealer: quieten a log ([filecoin-project/lotus#7998](https://github.com/filecoin-project/lotus/pull/7998))
+  - chore: build: make the OhSnap epoch configurable by an envvar for devnets ([filecoin-project/lotus#7995](https://github.com/filecoin-project/lotus/pull/7995))
+  - chore: chain: fix log ([filecoin-project/lotus#7993](https://github.com/filecoin-project/lotus/pull/7993))
+  - tvx: supply network version when extracting messages. ([filecoin-project/lotus#7996](https://github.com/filecoin-project/lotus/pull/7996))
+  - fix: sealer: manager should lock Unsealed for ReplicaUpdate ([filecoin-project/lotus#7986](https://github.com/filecoin-project/lotus/pull/7986))
+  - chore: remove inaccurate comment in sealtasks ([filecoin-project/lotus#7977](https://github.com/filecoin-project/lotus/pull/7977))
+  - update go-libp2p to v0.18.0-rc2 ([filecoin-project/lotus#7984](https://github.com/filecoin-project/lotus/pull/7984))
+  - Fix: sealer: ReplicaUpdate should fetch the correct files ([filecoin-project/lotus#7983](https://github.com/filecoin-project/lotus/pull/7983))
+  - libp2p v0.18.0-rc1 and initial resource manager integration ([filecoin-project/lotus#7969](https://github.com/filecoin-project/lotus/pull/7969))
+  - chore: merge release/v1.14.0 PRs into master ([filecoin-project/lotus#7979](https://github.com/filecoin-project/lotus/pull/7979))
+  - chore: update PR template ([filecoin-project/lotus#7918](https://github.com/filecoin-project/lotus/pull/7918))
+  - Fix: chain: create a new VM for each epoch ([filecoin-project/lotus#7966](https://github.com/filecoin-project/lotus/pull/7966))
+  - feat(deps): update markets stack ([filecoin-project/lotus#7959](https://github.com/filecoin-project/lotus/pull/7959))
+  - Use go-libp2p-connmgr v0.3.1 ([filecoin-project/lotus#7957](https://github.com/filecoin-project/lotus/pull/7957))
+  - feat: #7747 sealing: Adding conf variable for capping number of concurrent unsealing jobs (#7884) ([filecoin-project/lotus#7884](https://github.com/filecoin-project/lotus/pull/7884))
+  - build: release: bump master version to v1.15.0-dev ([filecoin-project/lotus#7922](https://github.com/filecoin-project/lotus/pull/7922))
+  - feat: build: butterfly SNAPNET ([filecoin-project/lotus#7932](https://github.com/filecoin-project/lotus/pull/7932))
+  - correctness fixes for the autobatch blockstore ([filecoin-project/lotus#7940](https://github.com/filecoin-project/lotus/pull/7940))
+  - fix: #7869 sealing: Add more deal expiration checks during PRU pipeline ([filecoin-project/lotus#7871](https://github.com/filecoin-project/lotus/pull/7871))
+  - fix: blockstore: Add missing locks to autobatch::Get() ([filecoin-project/lotus#7939](https://github.com/filecoin-project/lotus/pull/7939))
+  - feat: state: Fast migration for v15 ([filecoin-project/lotus#7933](https://github.com/filecoin-project/lotus/pull/7933))
+  - enhancement: #7891 sectors: disable existing existing cc upgrade path 2 days before the upgrade epoch ([filecoin-project/lotus#7900](https://github.com/filecoin-project/lotus/pull/7900))
+  - chore: deps: Integrate proof v11.0.0 ([filecoin-project/lotus#7923](https://github.com/filecoin-project/lotus/pull/7923))
+  - Snap Deals Lotus Integration: FSM Posting and integration test ([filecoin-project/lotus#7810](https://github.com/filecoin-project/lotus/pull/7810))
+  - chore: deps: Update go-paramfetch ([filecoin-project/lotus#7917](https://github.com/filecoin-project/lotus/pull/7917))
+  - feat: #7880 gas: add gas charge for VerifyReplicaUpdate ([filecoin-project/lotus#7897](https://github.com/filecoin-project/lotus/pull/7897))
+  - misc: build: v1.13.2 back to master ([filecoin-project/lotus#7910](https://github.com/filecoin-project/lotus/pull/7910))
+  - FIX: #7904 CI: generated vectors from v7 for bleeding edge ([filecoin-project/lotus#7903](https://github.com/filecoin-project/lotus/pull/7903))
+  - misc: docs: remove issue number from the pr title ([filecoin-project/lotus#7902](https://github.com/filecoin-project/lotus/pull/7902))
+  - Fix: state: circsuypply calc around null blocks ([filecoin-project/lotus#7890](https://github.com/filecoin-project/lotus/pull/7890))
+  - test vector runner fixes for v6 vectors ([filecoin-project/lotus#7881](https://github.com/filecoin-project/lotus/pull/7881))
+  - Shed: Add a util to send a batch of messages ([filecoin-project/lotus#7667](https://github.com/filecoin-project/lotus/pull/7667))
+  - Snapcraft grade no develgrade ([filecoin-project/lotus#7802](https://github.com/filecoin-project/lotus/pull/7802))
+  - fix: doc generation struct slice example value ([filecoin-project/lotus#7851](https://github.com/filecoin-project/lotus/pull/7851))
+  - fix: returned error not be accept correctly ([filecoin-project/lotus#7852](https://github.com/filecoin-project/lotus/pull/7852))
+  - Add api for transfer diagnostics ([filecoin-project/lotus#7759](https://github.com/filecoin-project/lotus/pull/7759))
+  - Refactor: VM: Remove the NetworkVersionGetter ([filecoin-project/lotus#7818](https://github.com/filecoin-project/lotus/pull/7818))
+  - fix: #7577 markets: When retrying Add Piece, first seek to start of reader ([filecoin-project/lotus#7812](https://github.com/filecoin-project/lotus/pull/7812))
+  - feat: #6017 market: retrieval ask CLI command ([filecoin-project/lotus#7814](https://github.com/filecoin-project/lotus/pull/7814))
+  - misc: n/a sealing: Fix grammatical error in a log warning message ([filecoin-project/lotus#7831](https://github.com/filecoin-project/lotus/pull/7831))
+  - sectors update-state checks if sector exists before changing its state ([filecoin-project/lotus#7762](https://github.com/filecoin-project/lotus/pull/7762))
+  - refactor: state: Move randomness versioning out of the VM ([filecoin-project/lotus#7816](https://github.com/filecoin-project/lotus/pull/7816))
+  - feat(graphsync): allow setting of per-peer incoming requests for miners ([filecoin-project/lotus#7578](https://github.com/filecoin-project/lotus/pull/7578))
+  - updating to new datastore/blockstore code with contexts ([filecoin-project/lotus#7646](https://github.com/filecoin-project/lotus/pull/7646))
+  - Shed: Add a util to list terminated deals ([filecoin-project/lotus#7774](https://github.com/filecoin-project/lotus/pull/7774))
+  - VM: Circ supply should be constant per epoch ([filecoin-project/lotus#7811](https://github.com/filecoin-project/lotus/pull/7811))
+  - chore: create pull_request_template.md ([filecoin-project/lotus#7726](https://github.com/filecoin-project/lotus/pull/7726))
+  - Mempool msg selection should respect block message limits ([filecoin-project/lotus#7321](https://github.com/filecoin-project/lotus/pull/7321))
+  - Merge v15 work into master ([filecoin-project/lotus#7784](https://github.com/filecoin-project/lotus/pull/7784))
+  - Expose EnableGasTracing as an env_var ([filecoin-project/lotus#7750](https://github.com/filecoin-project/lotus/pull/7750))
+  - Minor improvement for OpenTelemetry ([filecoin-project/lotus#7760](https://github.com/filecoin-project/lotus/pull/7760))
+  - Sort lotus-miner retrieval-deals by dealId ([filecoin-project/lotus#7749](https://github.com/filecoin-project/lotus/pull/7749))
+  - Make retrieval even faster ([filecoin-project/lotus#7746](https://github.com/filecoin-project/lotus/pull/7746))
+  - dep/fix 7701 Dependency: update to ipld-legacy to v0.1.1 ([filecoin-project/lotus#7751](https://github.com/filecoin-project/lotus/pull/7751))
+  - Command to list active sector locks ([filecoin-project/lotus#7735](https://github.com/filecoin-project/lotus/pull/7735))
+  - dagstore pieceReader: Always read full in ReadAt ([filecoin-project/lotus#7737](https://github.com/filecoin-project/lotus/pull/7737))
+  - SplitStore: supress compaction near upgrades ([filecoin-project/lotus#7734](https://github.com/filecoin-project/lotus/pull/7734))
+  - Disable appimage ([filecoin-project/lotus#7707](https://github.com/filecoin-project/lotus/pull/7707))
+  - Initial switch to OpenTelemetry ([filecoin-project/lotus#7725](https://github.com/filecoin-project/lotus/pull/7725))
+  - Bump the master version to v1.13.3-dev ([filecoin-project/lotus#7717](https://github.com/filecoin-project/lotus/pull/7717))
+- github.com/filecoin-project/dagstore (v0.4.3 -> v0.4.4):
+  failed to fetch repo
+- github.com/filecoin-project/go-amt-ipld/v4 (null -> v4.0.0):
+  - v4 (#60) ([filecoin-project/go-amt-ipld#60](https://github.com/filecoin-project/go-amt-ipld/pull/60))
+  - Merge pull request from GHSA-3wpc-wmc7-8p5g
+  - add .github/workflows/tagpush.yml
+  - add .github/workflows/release-check.yml
+  - add .github/workflows/releaser.yml
+  - update .github/workflows/go-check.yml
+  - update .github/workflows/go-test.yml
+  - add version.json file
+  - fix: fix bitWidth error message (#58) ([filecoin-project/go-amt-ipld#58](https://github.com/filecoin-project/go-amt-ipld/pull/58))
+  - update .github/workflows/go-check.yml
+  - update .github/workflows/go-test.yml
+  - update .github/workflows/automerge.yml
+- github.com/filecoin-project/go-commp-utils (v0.1.2 -> v0.1.3):
+  - chore(deps): clean up dependencies (#7) ([filecoin-project/go-commp-utils#7](https://github.com/filecoin-project/go-commp-utils/pull/7))
+- github.com/filecoin-project/go-ds-versioning (v0.1.0 -> v0.1.1):
+  - update to context datastores (#3) ([filecoin-project/go-ds-versioning#3](https://github.com/filecoin-project/go-ds-versioning/pull/3))
+  - ci(circle): fix versions (#4) ([filecoin-project/go-ds-versioning#4](https://github.com/filecoin-project/go-ds-versioning/pull/4))
+- github.com/filecoin-project/go-fil-markets (v1.13.4 -> v1.19.0):
+  - release: v1.19.0
+  - Update to go-data-transfer v1.14.0 / go-libp2p v0.18.0-rc1 (#669) ([filecoin-project/go-fil-markets#669](https://github.com/filecoin-project/go-fil-markets/pull/669))
+  - release: v1.18.0 (#671) ([filecoin-project/go-fil-markets#671](https://github.com/filecoin-project/go-fil-markets/pull/671))
+  - revert index provider PR #629 and associated PRs (#670) ([filecoin-project/go-fil-markets#670](https://github.com/filecoin-project/go-fil-markets/pull/670))
+  - log advertisement cid for announcement and update deps (#667) ([filecoin-project/go-fil-markets#667](https://github.com/filecoin-project/go-fil-markets/pull/667))
+  - release: v1.15.0 ([filecoin-project/go-fil-markets#661](https://github.com/filecoin-project/go-fil-markets/pull/661))
+  - retrieve by any CID (not just root CID) and reference provider integration (#629) ([filecoin-project/go-fil-markets#629](https://github.com/filecoin-project/go-fil-markets/pull/629))
+  - release: v1.14.1 ([filecoin-project/go-fil-markets#660](https://github.com/filecoin-project/go-fil-markets/pull/660))
+  - refactor: isolate commp in its own package to avoid exposing pulling filecoin-ffi (#659) ([filecoin-project/go-fil-markets#659](https://github.com/filecoin-project/go-fil-markets/pull/659))
+  - release: v1.14.0 ([filecoin-project/go-fil-markets#658](https://github.com/filecoin-project/go-fil-markets/pull/658))
+  - add SeekStart method to inflator reader (#656) ([filecoin-project/go-fil-markets#656](https://github.com/filecoin-project/go-fil-markets/pull/656))
+  - Merge tag 'v1.13.6'
+  - Timeout provider after waiting a period of time for transfer to restart (#655) ([filecoin-project/go-fil-markets#655](https://github.com/filecoin-project/go-fil-markets/pull/655))
+  - Update to context datastores (#653) ([filecoin-project/go-fil-markets#653](https://github.com/filecoin-project/go-fil-markets/pull/653))
+  - Fix and de-dupe link to spec (#652) ([filecoin-project/go-fil-markets#652](https://github.com/filecoin-project/go-fil-markets/pull/652))
+  - release: v1.13.4 (#651) ([filecoin-project/go-fil-markets#651](https://github.com/filecoin-project/go-fil-markets/pull/651))
+- github.com/filecoin-project/go-paramfetch (v0.0.2 -> v0.0.4):
+  - retry fetching once before erroring ([filecoin-project/go-paramfetch#22](https://github.com/filecoin-project/go-paramfetch/pull/22))
+  - Always verify SnapDeals params ([filecoin-project/go-paramfetch#20](https://github.com/filecoin-project/go-paramfetch/pull/20))
+- github.com/filecoin-project/go-state-types (v0.1.1 -> v0.1.3):
+  - CBOR encode Addr Pairs for keys (#35) ([filecoin-project/go-state-types#35](https://github.com/filecoin-project/go-state-types/pull/35))
+  - Add AddrPairKey (#34) ([filecoin-project/go-state-types#34](https://github.com/filecoin-project/go-state-types/pull/34))
+- github.com/filecoin-project/go-statestore (v0.1.1 -> v0.2.0):
+  - update to context datastores ([filecoin-project/go-statestore#10](https://github.com/filecoin-project/go-statestore/pull/10))
+- github.com/filecoin-project/go-storedcounter (v0.0.0-20200421200003-1c99c62e8a5b -> v0.1.0):
+  - Update go-datastore ([filecoin-project/go-storedcounter#1](https://github.com/filecoin-project/go-storedcounter/pull/1))
+- github.com/filecoin-project/specs-actors/v2 (v2.3.5 -> v2.3.6):
+  - Update to context datastores (#1541) ([filecoin-project/specs-actors#1541](https://github.com/filecoin-project/specs-actors/pull/1541))
+- github.com/filecoin-project/specs-storage (v0.1.1-0.20201105051918-5188d9774506 -> v0.2.0):
+  - FinalizeReplicaUpdate (#22) ([filecoin-project/specs-storage#22](https://github.com/filecoin-project/specs-storage/pull/22))
+  - Add release of sectorkey and replica update ([filecoin-project/specs-storage#20](https://github.com/filecoin-project/specs-storage/pull/20))
+  - Feat/update post gen (#19) ([filecoin-project/specs-storage#19](https://github.com/filecoin-project/specs-storage/pull/19))
+  - Add sector key to ReplicaUpdate iface method (#18) ([filecoin-project/specs-storage#18](https://github.com/filecoin-project/specs-storage/pull/18))
+  - Update for snap deals (#17) ([filecoin-project/specs-storage#17](https://github.com/filecoin-project/specs-storage/pull/17))
+  - Merge remote-tracking branch 'origin/feat/sector-ref'
+
+Contributors
+
+| Contributor | Commits | Lines ± | Files Changed |
+|-------------|---------|---------|---------------|
+| Aayush Rajasekaran | 116 | +12792/-3989 | 579 |
+| zenground0 | 38 | +8894/-1521 | 343 |
+| vyzo | 121 | +4537/-1470 | 258 |
+| zl | 1 | +3725/-309 | 8 |
+| dirkmc | 7 | +1392/-1110 | 61 |
+| Jennifer Wang | 55 | +890/-806 | 121 |
+| Łukasz Magiera | 35 | +1143/-339 | 104 |
+| whyrusleeping | 2 | +483/-585 | 28 |
+| Darko Brdareski | 14 | +725/-276 | 154 |
+| Rod Vagg | 3 | +45/-949 | 12 |
+| hannahhoward | 10 | +481/-133 | 35 |
+| Hannah Howard | 3 | +371/-234 | 22 |
+| c r | 4 | +425/-75 | 18 |
+| TheMenko | 8 | +237/-179 | 17 |
+| Aayush | 15 | +197/-106 | 57 |
+| ZenGround0 | 3 | +263/-25 | 11 |
+| Dirk McCormick | 12 | +188/-40 | 27 |
+| Peter Rabbitson | 3 | +128/-62 | 3 |
+| Steven Allen | 2 | +110/-74 | 2 |
+| Raúl Kripalani | 6 | +128/-49 | 9 |
+| Whyrusleeping | 1 | +76/-70 | 8 |
+| web3-bot | 10 | +99/-17 | 10 |
+| Jiaying Wang | 15 | +58/-23 | 15 |
+| Aarsh Shah | 1 | +23/-19 | 5 |
+| Travis Person | 2 | +2/-20 | 4 |
+| Jakub Sztandera | 3 | +13/-5 | 5 |
+| gstuart | 3 | +12/-1 | 3 |
+| Cory Schwartz | 4 | +5/-6 | 4 |
+| pefish | 1 | +4/-3 | 1 |
+| Colin Kennedy | 1 | +4/-2 | 1 |
+| Rob Quist | 1 | +2/-2 | 1 |
+| shotcollin | 1 | +1/-1 | 1 |
+

 # v1.13.2 /  2022-01-09

@@ -113,6 +113,8 @@ type StorageMiner interface {
 	// SectorCommitPending returns a list of pending Commit sectors to be sent in the next aggregate message
 	SectorCommitPending(ctx context.Context) ([]abi.SectorID, error) //perm:admin
 	SectorMatchPendingPiecesToOpenSectors(ctx context.Context) error //perm:admin
+	// SectorAbortUpgrade can be called on sectors that are in the process of being upgraded to abort it
+	SectorAbortUpgrade(context.Context, abi.SectorNumber) error //perm:admin

 	// WorkerConnect tells the node to connect to workers RPC
 	WorkerConnect(context.Context, string) error                              //perm:admin retry:true
@@ -130,6 +132,7 @@ type StorageMiner interface {
 	ReturnProveReplicaUpdate1(ctx context.Context, callID storiface.CallID, vanillaProofs storage.ReplicaVanillaProofs, err *storiface.CallError) error //perm:admin retry:true
 	ReturnProveReplicaUpdate2(ctx context.Context, callID storiface.CallID, proof storage.ReplicaUpdateProof, err *storiface.CallError) error           //perm:admin retry:true
 	ReturnGenerateSectorKeyFromData(ctx context.Context, callID storiface.CallID, err *storiface.CallError) error                                       //perm:admin retry:true
+	ReturnFinalizeReplicaUpdate(ctx context.Context, callID storiface.CallID, err *storiface.CallError) error                                           //perm:admin retry:true
 	ReturnReleaseUnsealed(ctx context.Context, callID storiface.CallID, err *storiface.CallError) error                                                 //perm:admin retry:true
 	ReturnMoveStorage(ctx context.Context, callID storiface.CallID, err *storiface.CallError) error                                                     //perm:admin retry:true
 	ReturnUnsealPiece(ctx context.Context, callID storiface.CallID, err *storiface.CallError) error                                                     //perm:admin retry:true
@@ -39,6 +39,7 @@ type Worker interface {
 	SealCommit1(ctx context.Context, sector storage.SectorRef, ticket abi.SealRandomness, seed abi.InteractiveSealRandomness, pieces []abi.PieceInfo, cids storage.SectorCids) (storiface.CallID, error) //perm:admin
 	SealCommit2(ctx context.Context, sector storage.SectorRef, c1o storage.Commit1Out) (storiface.CallID, error)                                                                                         //perm:admin
 	FinalizeSector(ctx context.Context, sector storage.SectorRef, keepUnsealed []storage.Range) (storiface.CallID, error)                                                                                //perm:admin
+	FinalizeReplicaUpdate(ctx context.Context, sector storage.SectorRef, keepUnsealed []storage.Range) (storiface.CallID, error)                                                                         //perm:admin
 	ReplicaUpdate(ctx context.Context, sector storage.SectorRef, pieces []abi.PieceInfo) (storiface.CallID, error)                                                                                       //perm:admin
 	ProveReplicaUpdate1(ctx context.Context, sector storage.SectorRef, sectorKey, newSealed, newUnsealed cid.Cid) (storiface.CallID, error)                                                              //perm:admin
 	ProveReplicaUpdate2(ctx context.Context, sector storage.SectorRef, sectorKey, newSealed, newUnsealed cid.Cid, vanillaProofs storage.ReplicaVanillaProofs) (storiface.CallID, error)                  //perm:admin
@@ -723,6 +723,8 @@ type StorageMinerStruct struct {

 		ReturnFetch func(p0 context.Context, p1 storiface.CallID, p2 *storiface.CallError) error `perm:"admin"`

+		ReturnFinalizeReplicaUpdate func(p0 context.Context, p1 storiface.CallID, p2 *storiface.CallError) error `perm:"admin"`
+
 		ReturnFinalizeSector func(p0 context.Context, p1 storiface.CallID, p2 *storiface.CallError) error `perm:"admin"`

 		ReturnGenerateSectorKeyFromData func(p0 context.Context, p1 storiface.CallID, p2 *storiface.CallError) error `perm:"admin"`
@@ -755,6 +757,8 @@ type StorageMinerStruct struct {

 		SealingSchedDiag func(p0 context.Context, p1 bool) (interface{}, error) `perm:"admin"`

+		SectorAbortUpgrade func(p0 context.Context, p1 abi.SectorNumber) error `perm:"admin"`
+
 		SectorAddPieceToAny func(p0 context.Context, p1 abi.UnpaddedPieceSize, p2 storage.Data, p3 PieceDealInfo) (SectorOffset, error) `perm:"admin"`

 		SectorCommitFlush func(p0 context.Context) ([]sealiface.CommitBatchRes, error) `perm:"admin"`
@@ -872,6 +876,8 @@ type WorkerStruct struct {

 		Fetch func(p0 context.Context, p1 storage.SectorRef, p2 storiface.SectorFileType, p3 storiface.PathType, p4 storiface.AcquireMode) (storiface.CallID, error) `perm:"admin"`

+		FinalizeReplicaUpdate func(p0 context.Context, p1 storage.SectorRef, p2 []storage.Range) (storiface.CallID, error) `perm:"admin"`
+
 		FinalizeSector func(p0 context.Context, p1 storage.SectorRef, p2 []storage.Range) (storiface.CallID, error) `perm:"admin"`

 		GenerateSectorKeyFromData func(p0 context.Context, p1 storage.SectorRef, p2 cid.Cid) (storiface.CallID, error) `perm:"admin"`
@@ -4280,6 +4286,17 @@ func (s *StorageMinerStub) ReturnFetch(p0 context.Context, p1 storiface.CallID,
 	return ErrNotSupported
 }

+func (s *StorageMinerStruct) ReturnFinalizeReplicaUpdate(p0 context.Context, p1 storiface.CallID, p2 *storiface.CallError) error {
+	if s.Internal.ReturnFinalizeReplicaUpdate == nil {
+		return ErrNotSupported
+	}
+	return s.Internal.ReturnFinalizeReplicaUpdate(p0, p1, p2)
+}
+
+func (s *StorageMinerStub) ReturnFinalizeReplicaUpdate(p0 context.Context, p1 storiface.CallID, p2 *storiface.CallError) error {
+	return ErrNotSupported
+}
+
 func (s *StorageMinerStruct) ReturnFinalizeSector(p0 context.Context, p1 storiface.CallID, p2 *storiface.CallError) error {
 	if s.Internal.ReturnFinalizeSector == nil {
 		return ErrNotSupported
@@ -4456,6 +4473,17 @@ func (s *StorageMinerStub) SealingSchedDiag(p0 context.Context, p1 bool) (interf
 	return nil, ErrNotSupported
 }

+func (s *StorageMinerStruct) SectorAbortUpgrade(p0 context.Context, p1 abi.SectorNumber) error {
+	if s.Internal.SectorAbortUpgrade == nil {
+		return ErrNotSupported
+	}
+	return s.Internal.SectorAbortUpgrade(p0, p1)
+}
+
+func (s *StorageMinerStub) SectorAbortUpgrade(p0 context.Context, p1 abi.SectorNumber) error {
+	return ErrNotSupported
+}
+
 func (s *StorageMinerStruct) SectorAddPieceToAny(p0 context.Context, p1 abi.UnpaddedPieceSize, p2 storage.Data, p3 PieceDealInfo) (SectorOffset, error) {
 	if s.Internal.SectorAddPieceToAny == nil {
 		return *new(SectorOffset), ErrNotSupported
@@ -5006,6 +5034,17 @@ func (s *WorkerStub) Fetch(p0 context.Context, p1 storage.SectorRef, p2 storifac
 	return *new(storiface.CallID), ErrNotSupported
 }

+func (s *WorkerStruct) FinalizeReplicaUpdate(p0 context.Context, p1 storage.SectorRef, p2 []storage.Range) (storiface.CallID, error) {
+	if s.Internal.FinalizeReplicaUpdate == nil {
+		return *new(storiface.CallID), ErrNotSupported
+	}
+	return s.Internal.FinalizeReplicaUpdate(p0, p1, p2)
+}
+
+func (s *WorkerStub) FinalizeReplicaUpdate(p0 context.Context, p1 storage.SectorRef, p2 []storage.Range) (storiface.CallID, error) {
+	return *new(storiface.CallID), ErrNotSupported
+}
+
 func (s *WorkerStruct) FinalizeSector(p0 context.Context, p1 storage.SectorRef, p2 []storage.Range) (storiface.CallID, error) {
 	if s.Internal.FinalizeSector == nil {
 		return *new(storiface.CallID), ErrNotSupported
@@ -49,10 +49,11 @@ These are options in the `[Chainstore.Splitstore]` section of the configuration:
  blockstore and discards writes; this is necessary to support syncing from a snapshot.
 - `MarkSetType` -- specifies the type of markset to use during compaction.
  The markset is the data structure used by compaction/gc to track live objects.
-  The default value is `"map"`, which will use an in-memory map; if you are limited
-  in memory (or indeed see compaction run out of memory), you can also specify
-  `"badger"` which will use an disk backed markset, using badger. This will use
-  much less memory, but will also make compaction slower.
+  The default value is "badger", which will use a disk backed markset using badger.
+  If you have a lot of memory (48G or more) you can also use "map", which will use
+  an in memory markset, speeding up compaction at the cost of higher memory usage.
+  Note: If you are using a VPS with a network volume, you need to provision at least
+  3000 IOPs with the badger markset.
 - `HotStoreMessageRetention` -- specifies how many finalities, beyond the 4
  finalities maintained by default, to maintain messages and message receipts in the
  hotstore. This is useful for assistive nodes that want to support syncing for other
@@ -105,6 +106,12 @@ Compaction works transactionally with the following algorithm:
  - We delete in small batches taking a lock; each batch is checked again for marks, from the concurrent transactional mark, so as to never delete anything live
 - We then end the transaction and compact/gc the hotstore.

+As of [#8008](https://github.com/filecoin-project/lotus/pull/8008) the compaction algorithm has been
+modified to eliminate sorting and maintain the cold object set on disk. This drastically reduces
+memory usage; in fact, when using badger as the markset compaction uses very little memory, and
+it should be now possible to run splitstore with 32GB of RAM or less without danger of running out of
+memory during compaction.
+
 ## Garbage Collection

 TBD -- see [#6577](https://github.com/filecoin-project/lotus/issues/6577)
@@ -0,0 +1,118 @@
+package splitstore
+
+import (
+	"bufio"
+	"io"
+	"os"
+
+	"golang.org/x/xerrors"
+
+	cid "github.com/ipfs/go-cid"
+	mh "github.com/multiformats/go-multihash"
+)
+
+type Checkpoint struct {
+	file *os.File
+	buf  *bufio.Writer
+}
+
+func NewCheckpoint(path string) (*Checkpoint, error) {
+	file, err := os.OpenFile(path, os.O_CREATE|os.O_TRUNC|os.O_WRONLY|os.O_SYNC, 0644)
+	if err != nil {
+		return nil, xerrors.Errorf("error creating checkpoint: %w", err)
+	}
+	buf := bufio.NewWriter(file)
+
+	return &Checkpoint{
+		file: file,
+		buf:  buf,
+	}, nil
+}
+
+func OpenCheckpoint(path string) (*Checkpoint, cid.Cid, error) {
+	filein, err := os.Open(path)
+	if err != nil {
+		return nil, cid.Undef, xerrors.Errorf("error opening checkpoint for reading: %w", err)
+	}
+	defer filein.Close() //nolint:errcheck
+
+	bufin := bufio.NewReader(filein)
+	start, err := readRawCid(bufin, nil)
+	if err != nil && err != io.EOF {
+		return nil, cid.Undef, xerrors.Errorf("error reading cid from checkpoint: %w", err)
+	}
+
+	fileout, err := os.OpenFile(path, os.O_WRONLY|os.O_SYNC, 0644)
+	if err != nil {
+		return nil, cid.Undef, xerrors.Errorf("error opening checkpoint for writing: %w", err)
+	}
+	bufout := bufio.NewWriter(fileout)
+
+	return &Checkpoint{
+		file: fileout,
+		buf:  bufout,
+	}, start, nil
+}
+
+func (cp *Checkpoint) Set(c cid.Cid) error {
+	if _, err := cp.file.Seek(0, io.SeekStart); err != nil {
+		return xerrors.Errorf("error seeking beginning of checkpoint: %w", err)
+	}
+
+	if err := writeRawCid(cp.buf, c, true); err != nil {
+		return xerrors.Errorf("error writing cid to checkpoint: %w", err)
+	}
+
+	return nil
+}
+
+func (cp *Checkpoint) Close() error {
+	if cp.file == nil {
+		return nil
+	}
+
+	err := cp.file.Close()
+	cp.file = nil
+	cp.buf = nil
+
+	return err
+}
+
+func readRawCid(buf *bufio.Reader, hbuf []byte) (cid.Cid, error) {
+	sz, err := buf.ReadByte()
+	if err != nil {
+		return cid.Undef, err // don't wrap EOF as it is not an error here
+	}
+
+	if hbuf == nil {
+		hbuf = make([]byte, int(sz))
+	} else {
+		hbuf = hbuf[:int(sz)]
+	}
+
+	if _, err := io.ReadFull(buf, hbuf); err != nil {
+		return cid.Undef, xerrors.Errorf("error reading hash: %w", err) // wrap EOF, it's corrupt
+	}
+
+	hash, err := mh.Cast(hbuf)
+	if err != nil {
+		return cid.Undef, xerrors.Errorf("error casting multihash: %w", err)
+	}
+
+	return cid.NewCidV1(cid.Raw, hash), nil
+}
+
+func writeRawCid(buf *bufio.Writer, c cid.Cid, flush bool) error {
+	hash := c.Hash()
+	if err := buf.WriteByte(byte(len(hash))); err != nil {
+		return err
+	}
+	if _, err := buf.Write(hash); err != nil {
+		return err
+	}
+	if flush {
+		return buf.Flush()
+	}
+
+	return nil
+}
@@ -0,0 +1,147 @@
+package splitstore
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/ipfs/go-cid"
+	"github.com/multiformats/go-multihash"
+)
+
+func TestCheckpoint(t *testing.T) {
+	dir, err := ioutil.TempDir("", "checkpoint.*")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	t.Cleanup(func() {
+		_ = os.RemoveAll(dir)
+	})
+
+	path := filepath.Join(dir, "checkpoint")
+
+	makeCid := func(key string) cid.Cid {
+		h, err := multihash.Sum([]byte(key), multihash.SHA2_256, -1)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		return cid.NewCidV1(cid.Raw, h)
+	}
+
+	k1 := makeCid("a")
+	k2 := makeCid("b")
+	k3 := makeCid("c")
+	k4 := makeCid("d")
+
+	cp, err := NewCheckpoint(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if err := cp.Set(k1); err != nil {
+		t.Fatal(err)
+	}
+	if err := cp.Set(k2); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := cp.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	cp, start, err := OpenCheckpoint(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !start.Equals(k2) {
+		t.Fatalf("expected start to be %s; got %s", k2, start)
+	}
+
+	if err := cp.Set(k3); err != nil {
+		t.Fatal(err)
+	}
+	if err := cp.Set(k4); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := cp.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	cp, start, err = OpenCheckpoint(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !start.Equals(k4) {
+		t.Fatalf("expected start to be %s; got %s", k4, start)
+	}
+
+	if err := cp.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	// also test correct operation with an empty checkpoint
+	cp, err = NewCheckpoint(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if err := cp.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	cp, start, err = OpenCheckpoint(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if start.Defined() {
+		t.Fatal("expected start to be undefined")
+	}
+
+	if err := cp.Set(k1); err != nil {
+		t.Fatal(err)
+	}
+	if err := cp.Set(k2); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := cp.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	cp, start, err = OpenCheckpoint(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !start.Equals(k2) {
+		t.Fatalf("expected start to be %s; got %s", k2, start)
+	}
+
+	if err := cp.Set(k3); err != nil {
+		t.Fatal(err)
+	}
+	if err := cp.Set(k4); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := cp.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	cp, start, err = OpenCheckpoint(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !start.Equals(k4) {
+		t.Fatalf("expected start to be %s; got %s", k4, start)
+	}
+
+	if err := cp.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+}
@@ -0,0 +1,102 @@
+package splitstore
+
+import (
+	"bufio"
+	"io"
+	"os"
+
+	"golang.org/x/xerrors"
+
+	cid "github.com/ipfs/go-cid"
+)
+
+type ColdSetWriter struct {
+	file *os.File
+	buf  *bufio.Writer
+}
+
+type ColdSetReader struct {
+	file *os.File
+	buf  *bufio.Reader
+}
+
+func NewColdSetWriter(path string) (*ColdSetWriter, error) {
+	file, err := os.OpenFile(path, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0644)
+	if err != nil {
+		return nil, xerrors.Errorf("error creating coldset: %w", err)
+	}
+	buf := bufio.NewWriter(file)
+
+	return &ColdSetWriter{
+		file: file,
+		buf:  buf,
+	}, nil
+}
+
+func NewColdSetReader(path string) (*ColdSetReader, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, xerrors.Errorf("error opening coldset: %w", err)
+	}
+	buf := bufio.NewReader(file)
+
+	return &ColdSetReader{
+		file: file,
+		buf:  buf,
+	}, nil
+}
+
+func (s *ColdSetWriter) Write(c cid.Cid) error {
+	return writeRawCid(s.buf, c, false)
+}
+
+func (s *ColdSetWriter) Close() error {
+	if s.file == nil {
+		return nil
+	}
+
+	err1 := s.buf.Flush()
+	err2 := s.file.Close()
+	s.buf = nil
+	s.file = nil
+
+	if err1 != nil {
+		return err1
+	}
+	return err2
+}
+
+func (s *ColdSetReader) ForEach(f func(cid.Cid) error) error {
+	hbuf := make([]byte, 256)
+	for {
+		next, err := readRawCid(s.buf, hbuf)
+		if err != nil {
+			if err == io.EOF {
+				return nil
+			}
+
+			return xerrors.Errorf("error reading coldset: %w", err)
+		}
+
+		if err := f(next); err != nil {
+			return err
+		}
+	}
+}
+
+func (s *ColdSetReader) Reset() error {
+	_, err := s.file.Seek(0, io.SeekStart)
+	return err
+}
+
+func (s *ColdSetReader) Close() error {
+	if s.file == nil {
+		return nil
+	}
+
+	err := s.file.Close()
+	s.file = nil
+	s.buf = nil
+
+	return err
+}
@@ -0,0 +1,99 @@
+package splitstore
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/ipfs/go-cid"
+	"github.com/multiformats/go-multihash"
+)
+
+func TestColdSet(t *testing.T) {
+	dir, err := ioutil.TempDir("", "coldset.*")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	t.Cleanup(func() {
+		_ = os.RemoveAll(dir)
+	})
+
+	path := filepath.Join(dir, "coldset")
+
+	makeCid := func(i int) cid.Cid {
+		h, err := multihash.Sum([]byte(fmt.Sprintf("cid.%d", i)), multihash.SHA2_256, -1)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		return cid.NewCidV1(cid.Raw, h)
+	}
+
+	const count = 1000
+	cids := make([]cid.Cid, 0, count)
+	for i := 0; i < count; i++ {
+		cids = append(cids, makeCid(i))
+	}
+
+	cw, err := NewColdSetWriter(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	for _, c := range cids {
+		if err := cw.Write(c); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	if err := cw.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	cr, err := NewColdSetReader(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	index := 0
+	err = cr.ForEach(func(c cid.Cid) error {
+		if index >= count {
+			t.Fatal("too many cids")
+		}
+
+		if !c.Equals(cids[index]) {
+			t.Fatalf("wrong cid %d; expected %s but got %s", index, cids[index], c)
+		}
+
+		index++
+		return nil
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if err := cr.Reset(); err != nil {
+		t.Fatal(err)
+	}
+
+	index = 0
+	err = cr.ForEach(func(c cid.Cid) error {
+		if index >= count {
+			t.Fatal("too many cids")
+		}
+
+		if !c.Equals(cids[index]) {
+			t.Fatalf("wrong cid; expected %s but got %s", cids[index], c)
+		}
+
+		index++
+		return nil
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+}
@@ -14,15 +14,24 @@ var errMarkSetClosed = errors.New("markset closed")
 type MarkSet interface {
 	ObjectVisitor
 	Mark(cid.Cid) error
+	MarkMany([]cid.Cid) error
 	Has(cid.Cid) (bool, error)
 	Close() error
+
+	// BeginCriticalSection ensures that the markset is persisted to disk for recovery in case
+	// of abnormal termination during the critical section span.
+	BeginCriticalSection() error
+	// EndCriticalSection ends the critical section span.
+	EndCriticalSection()
 }

 type MarkSetEnv interface {
-	// Create creates a new markset within the environment.
-	// name is a unique name for this markset, mapped to the filesystem in disk-backed environments
+	// New creates a new markset within the environment.
+	// name is a unique name for this markset, mapped to the filesystem for on-disk persistence.
 	// sizeHint is a hint about the expected size of the markset
-	Create(name string, sizeHint int64) (MarkSet, error)
+	New(name string, sizeHint int64) (MarkSet, error)
+	// Recover recovers an existing markset persisted on-disk.
+	Recover(name string) (MarkSet, error)
 	// Close closes the markset
 	Close() error
 }
@@ -30,7 +39,7 @@ type MarkSetEnv interface {
 func OpenMarkSetEnv(path string, mtype string) (MarkSetEnv, error) {
 	switch mtype {
 	case "map":
-		return NewMapMarkSetEnv()
+		return NewMapMarkSetEnv(path)
 	case "badger":
 		return NewBadgerMarkSetEnv(path)
 	default:
@@ -3,6 +3,7 @@ package splitstore
 import (
 	"os"
 	"path/filepath"
+	"runtime"
 	"sync"

 	"golang.org/x/xerrors"
@@ -28,6 +29,7 @@ type BadgerMarkSet struct {
 	writers int
 	seqno   int
 	version int
+	persist bool

 	db   *badger.DB
 	path string
@@ -47,11 +49,10 @@ func NewBadgerMarkSetEnv(path string) (MarkSetEnv, error) {
 	return &BadgerMarkSetEnv{path: msPath}, nil
 }

-func (e *BadgerMarkSetEnv) Create(name string, sizeHint int64) (MarkSet, error) {
-	name += ".tmp"
+func (e *BadgerMarkSetEnv) New(name string, sizeHint int64) (MarkSet, error) {
 	path := filepath.Join(e.path, name)

-	db, err := openTransientBadgerDB(path)
+	db, err := openBadgerDB(path, false)
 	if err != nil {
 		return nil, xerrors.Errorf("error creating badger db: %w", err)
 	}
@@ -67,8 +68,72 @@ func (e *BadgerMarkSetEnv) Create(name string, sizeHint int64) (MarkSet, error)
 	return ms, nil
 }

+func (e *BadgerMarkSetEnv) Recover(name string) (MarkSet, error) {
+	path := filepath.Join(e.path, name)
+
+	if _, err := os.Stat(path); err != nil {
+		return nil, xerrors.Errorf("error stating badger db path: %w", err)
+	}
+
+	db, err := openBadgerDB(path, true)
+	if err != nil {
+		return nil, xerrors.Errorf("error creating badger db: %w", err)
+	}
+
+	ms := &BadgerMarkSet{
+		pend:    make(map[string]struct{}),
+		writing: make(map[int]map[string]struct{}),
+		db:      db,
+		path:    path,
+		persist: true,
+	}
+	ms.cond.L = &ms.mx
+
+	return ms, nil
+}
+
 func (e *BadgerMarkSetEnv) Close() error {
-	return os.RemoveAll(e.path)
+	return nil
+}
+
+func (s *BadgerMarkSet) BeginCriticalSection() error {
+	s.mx.Lock()
+
+	if s.persist {
+		s.mx.Unlock()
+		return nil
+	}
+
+	var write bool
+	var seqno int
+	if len(s.pend) > 0 {
+		write = true
+		seqno = s.nextBatch()
+	}
+
+	s.persist = true
+	s.mx.Unlock()
+
+	if write {
+		// all writes sync once perist is true
+		return s.write(seqno)
+	}
+
+	// wait for any pending writes and sync
+	s.mx.Lock()
+	for s.writers > 0 {
+		s.cond.Wait()
+	}
+	s.mx.Unlock()
+
+	return s.db.Sync()
+}
+
+func (s *BadgerMarkSet) EndCriticalSection() {
+	s.mx.Lock()
+	defer s.mx.Unlock()
+
+	s.persist = false
 }

 func (s *BadgerMarkSet) Mark(c cid.Cid) error {
@@ -88,6 +153,23 @@ func (s *BadgerMarkSet) Mark(c cid.Cid) error {
 	return nil
 }

+func (s *BadgerMarkSet) MarkMany(batch []cid.Cid) error {
+	s.mx.Lock()
+	if s.pend == nil {
+		s.mx.Unlock()
+		return errMarkSetClosed
+	}
+
+	write, seqno := s.putMany(batch)
+	s.mx.Unlock()
+
+	if write {
+		return s.write(seqno)
+	}
+
+	return nil
+}
+
 func (s *BadgerMarkSet) Has(c cid.Cid) (bool, error) {
 	s.mx.RLock()
 	defer s.mx.RUnlock()
@@ -193,16 +275,34 @@ func (s *BadgerMarkSet) tryDB(key []byte) (has bool, err error) {
 // writer holds the exclusive lock
 func (s *BadgerMarkSet) put(key string) (write bool, seqno int) {
 	s.pend[key] = struct{}{}
-	if len(s.pend) < badgerMarkSetBatchSize {
+	if !s.persist && len(s.pend) < badgerMarkSetBatchSize {
 		return false, 0
 	}

-	seqno = s.seqno
+	seqno = s.nextBatch()
+	return true, seqno
+}
+
+func (s *BadgerMarkSet) putMany(batch []cid.Cid) (write bool, seqno int) {
+	for _, c := range batch {
+		key := string(c.Hash())
+		s.pend[key] = struct{}{}
+	}
+
+	if !s.persist && len(s.pend) < badgerMarkSetBatchSize {
+		return false, 0
+	}
+
+	seqno = s.nextBatch()
+	return true, seqno
+}
+
+func (s *BadgerMarkSet) nextBatch() int {
+	seqno := s.seqno
 	s.seqno++
 	s.writing[seqno] = s.pend
 	s.pend = make(map[string]struct{})
-
-	return true, seqno
+	return seqno
 }

 func (s *BadgerMarkSet) write(seqno int) (err error) {
@@ -247,6 +347,14 @@ func (s *BadgerMarkSet) write(seqno int) (err error) {
 		return xerrors.Errorf("error flushing batch to badger markset: %w", err)
 	}

+	s.mx.RLock()
+	persist := s.persist
+	s.mx.RUnlock()
+
+	if persist {
+		return s.db.Sync()
+	}
+
 	return nil
 }

@@ -266,26 +374,29 @@ func (s *BadgerMarkSet) Close() error {
 	db := s.db
 	s.db = nil

-	return closeTransientBadgerDB(db, s.path)
+	return closeBadgerDB(db, s.path, s.persist)
 }

-func (s *BadgerMarkSet) SetConcurrent() {}
+func openBadgerDB(path string, recover bool) (*badger.DB, error) {
+	// if it is not a recovery, clean up first
+	if !recover {
+		err := os.RemoveAll(path)
+		if err != nil {
+			return nil, xerrors.Errorf("error clearing markset directory: %w", err)
+		}

-func openTransientBadgerDB(path string) (*badger.DB, error) {
-	// clean up first
-	err := os.RemoveAll(path)
-	if err != nil {
-		return nil, xerrors.Errorf("error clearing markset directory: %w", err)
-	}
-
-	err = os.MkdirAll(path, 0755) //nolint:gosec
-	if err != nil {
-		return nil, xerrors.Errorf("error creating markset directory: %w", err)
+		err = os.MkdirAll(path, 0755) //nolint:gosec
+		if err != nil {
+			return nil, xerrors.Errorf("error creating markset directory: %w", err)
+		}
 	}

 	opts := badger.DefaultOptions(path)
+	// we manually sync when we are in critical section
 	opts.SyncWrites = false
+	// no need to do that
 	opts.CompactL0OnClose = false
+	// we store hashes, not much to gain by compression
 	opts.Compression = options.None
 	// Note: We use FileIO for loading modes to avoid memory thrashing and interference
 	//       between the system blockstore and the markset.
@@ -294,6 +405,15 @@ func openTransientBadgerDB(path string) (*badger.DB, error) {
 	//       exceeded 1GB in size.
 	opts.TableLoadingMode = options.FileIO
 	opts.ValueLogLoadingMode = options.FileIO
+	// We increase the number of L0 tables before compaction to make it unlikely to
+	// be necessary.
+	opts.NumLevelZeroTables = 20      // default is 5
+	opts.NumLevelZeroTablesStall = 30 // default is 10
+	// increase the number of compactors from default 2 so that if we ever have to
+	// compact, it is fast
+	if runtime.NumCPU()/2 > opts.NumCompactors {
+		opts.NumCompactors = runtime.NumCPU() / 2
+	}
 	opts.Logger = &badgerLogger{
 		SugaredLogger: log.Desugar().WithOptions(zap.AddCallerSkip(1)).Sugar(),
 		skip2:         log.Desugar().WithOptions(zap.AddCallerSkip(2)).Sugar(),
@@ -302,12 +422,16 @@ func openTransientBadgerDB(path string) (*badger.DB, error) {
 	return badger.Open(opts)
 }

-func closeTransientBadgerDB(db *badger.DB, path string) error {
+func closeBadgerDB(db *badger.DB, path string, persist bool) error {
 	err := db.Close()
 	if err != nil {
 		return xerrors.Errorf("error closing badger markset: %w", err)
 	}

+	if persist {
+		return nil
+	}
+
 	err = os.RemoveAll(path)
 	if err != nil {
 		return xerrors.Errorf("error deleting badger markset: %w", err)
@@ -1,37 +1,104 @@
 package splitstore

 import (
+	"bufio"
+	"io"
+	"os"
+	"path/filepath"
 	"sync"

+	"golang.org/x/xerrors"
+
 	cid "github.com/ipfs/go-cid"
 )

-type MapMarkSetEnv struct{}
+type MapMarkSetEnv struct {
+	path string
+}

 var _ MarkSetEnv = (*MapMarkSetEnv)(nil)

 type MapMarkSet struct {
 	mx  sync.RWMutex
 	set map[string]struct{}
+
+	persist bool
+	file    *os.File
+	buf     *bufio.Writer
+
+	path string
 }

 var _ MarkSet = (*MapMarkSet)(nil)

-func NewMapMarkSetEnv() (*MapMarkSetEnv, error) {
-	return &MapMarkSetEnv{}, nil
+func NewMapMarkSetEnv(path string) (*MapMarkSetEnv, error) {
+	msPath := filepath.Join(path, "markset.map")
+	err := os.MkdirAll(msPath, 0755) //nolint:gosec
+	if err != nil {
+		return nil, xerrors.Errorf("error creating markset directory: %w", err)
+	}
+
+	return &MapMarkSetEnv{path: msPath}, nil
 }

-func (e *MapMarkSetEnv) Create(name string, sizeHint int64) (MarkSet, error) {
+func (e *MapMarkSetEnv) New(name string, sizeHint int64) (MarkSet, error) {
+	path := filepath.Join(e.path, name)
 	return &MapMarkSet{
-		set: make(map[string]struct{}, sizeHint),
+		set:  make(map[string]struct{}, sizeHint),
+		path: path,
 	}, nil
 }

+func (e *MapMarkSetEnv) Recover(name string) (MarkSet, error) {
+	path := filepath.Join(e.path, name)
+	s := &MapMarkSet{
+		set:  make(map[string]struct{}),
+		path: path,
+	}
+
+	in, err := os.Open(path)
+	if err != nil {
+		return nil, xerrors.Errorf("error opening markset file for read: %w", err)
+	}
+	defer in.Close() //nolint:errcheck
+
+	// wrap a buffered reader to make this faster
+	buf := bufio.NewReader(in)
+	for {
+		var sz byte
+		if sz, err = buf.ReadByte(); err != nil {
+			break
+		}
+
+		key := make([]byte, int(sz))
+		if _, err = io.ReadFull(buf, key); err != nil {
+			break
+		}
+
+		s.set[string(key)] = struct{}{}
+	}
+
+	if err != io.EOF {
+		return nil, xerrors.Errorf("error reading markset file: %w", err)
+	}
+
+	file, err := os.OpenFile(s.path, os.O_WRONLY|os.O_APPEND, 0)
+	if err != nil {
+		return nil, xerrors.Errorf("error opening markset file for write: %w", err)
+	}
+
+	s.persist = true
+	s.file = file
+	s.buf = bufio.NewWriter(file)
+
+	return s, nil
+}
+
 func (e *MapMarkSetEnv) Close() error {
 	return nil
 }

-func (s *MapMarkSet) Mark(cid cid.Cid) error {
+func (s *MapMarkSet) BeginCriticalSection() error {
 	s.mx.Lock()
 	defer s.mx.Unlock()

@@ -39,7 +106,104 @@ func (s *MapMarkSet) Mark(cid cid.Cid) error {
 		return errMarkSetClosed
 	}

-	s.set[string(cid.Hash())] = struct{}{}
+	if s.persist {
+		return nil
+	}
+
+	file, err := os.OpenFile(s.path, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0644)
+	if err != nil {
+		return xerrors.Errorf("error opening markset file: %w", err)
+	}
+
+	// wrap a buffered writer to make this faster
+	s.buf = bufio.NewWriter(file)
+	for key := range s.set {
+		if err := s.writeKey([]byte(key), false); err != nil {
+			_ = file.Close()
+			s.buf = nil
+			return err
+		}
+	}
+	if err := s.buf.Flush(); err != nil {
+		_ = file.Close()
+		s.buf = nil
+		return xerrors.Errorf("error flushing markset file buffer: %w", err)
+	}
+
+	s.file = file
+	s.persist = true
+
+	return nil
+}
+
+func (s *MapMarkSet) EndCriticalSection() {
+	s.mx.Lock()
+	defer s.mx.Unlock()
+
+	if !s.persist {
+		return
+	}
+
+	_ = s.file.Close()
+	_ = os.Remove(s.path)
+	s.file = nil
+	s.buf = nil
+	s.persist = false
+}
+
+func (s *MapMarkSet) Mark(c cid.Cid) error {
+	s.mx.Lock()
+	defer s.mx.Unlock()
+
+	if s.set == nil {
+		return errMarkSetClosed
+	}
+
+	hash := c.Hash()
+	s.set[string(hash)] = struct{}{}
+
+	if s.persist {
+		if err := s.writeKey(hash, true); err != nil {
+			return err
+		}
+
+		if err := s.file.Sync(); err != nil {
+			return xerrors.Errorf("error syncing markset: %w", err)
+		}
+	}
+
+	return nil
+}
+
+func (s *MapMarkSet) MarkMany(batch []cid.Cid) error {
+	s.mx.Lock()
+	defer s.mx.Unlock()
+
+	if s.set == nil {
+		return errMarkSetClosed
+	}
+
+	for _, c := range batch {
+		hash := c.Hash()
+		s.set[string(hash)] = struct{}{}
+
+		if s.persist {
+			if err := s.writeKey(hash, false); err != nil {
+				return err
+			}
+		}
+	}
+
+	if s.persist {
+		if err := s.buf.Flush(); err != nil {
+			return xerrors.Errorf("error flushing markset buffer to disk: %w", err)
+		}
+
+		if err := s.file.Sync(); err != nil {
+			return xerrors.Errorf("error syncing markset: %w", err)
+		}
+	}
+
 	return nil
 }

@@ -63,12 +227,23 @@ func (s *MapMarkSet) Visit(c cid.Cid) (bool, error) {
 		return false, errMarkSetClosed
 	}

-	key := string(c.Hash())
+	hash := c.Hash()
+	key := string(hash)
 	if _, ok := s.set[key]; ok {
 		return false, nil
 	}

 	s.set[key] = struct{}{}
+
+	if s.persist {
+		if err := s.writeKey(hash, true); err != nil {
+			return false, err
+		}
+		if err := s.file.Sync(); err != nil {
+			return false, xerrors.Errorf("error syncing markset: %w", err)
+		}
+	}
+
 	return true, nil
 }

@@ -76,6 +251,39 @@ func (s *MapMarkSet) Close() error {
 	s.mx.Lock()
 	defer s.mx.Unlock()

+	if s.set == nil {
+		return nil
+	}
+
 	s.set = nil
+
+	if s.file != nil {
+		if err := s.file.Close(); err != nil {
+			log.Warnf("error closing markset file: %s", err)
+		}
+
+		if !s.persist {
+			if err := os.Remove(s.path); err != nil {
+				log.Warnf("error removing markset file: %s", err)
+			}
+		}
+	}
+
+	return nil
+}
+
+func (s *MapMarkSet) writeKey(k []byte, flush bool) error {
+	if err := s.buf.WriteByte(byte(len(k))); err != nil {
+		return xerrors.Errorf("error writing markset key length to disk: %w", err)
+	}
+	if _, err := s.buf.Write(k); err != nil {
+		return xerrors.Errorf("error writing markset key to disk: %w", err)
+	}
+	if flush {
+		if err := s.buf.Flush(); err != nil {
+			return xerrors.Errorf("error flushing markset buffer to disk: %w", err)
+		}
+	}
+
 	return nil
 }
@@ -11,7 +11,10 @@ import (

 func TestMapMarkSet(t *testing.T) {
 	testMarkSet(t, "map")
+	testMarkSetRecovery(t, "map")
+	testMarkSetMarkMany(t, "map")
 	testMarkSetVisitor(t, "map")
+	testMarkSetVisitorRecovery(t, "map")
 }

 func TestBadgerMarkSet(t *testing.T) {
@@ -21,12 +24,13 @@ func TestBadgerMarkSet(t *testing.T) {
 		badgerMarkSetBatchSize = bs
 	})
 	testMarkSet(t, "badger")
+	testMarkSetRecovery(t, "badger")
+	testMarkSetMarkMany(t, "badger")
 	testMarkSetVisitor(t, "badger")
+	testMarkSetVisitorRecovery(t, "badger")
 }

 func testMarkSet(t *testing.T, lsType string) {
-	t.Helper()
-
 	path, err := ioutil.TempDir("", "markset.*")
 	if err != nil {
 		t.Fatal(err)
@@ -42,12 +46,12 @@ func testMarkSet(t *testing.T, lsType string) {
 	}
 	defer env.Close() //nolint:errcheck

-	hotSet, err := env.Create("hot", 0)
+	hotSet, err := env.New("hot", 0)
 	if err != nil {
 		t.Fatal(err)
 	}

-	coldSet, err := env.Create("cold", 0)
+	coldSet, err := env.New("cold", 0)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -62,6 +66,7 @@ func testMarkSet(t *testing.T, lsType string) {
 	}

 	mustHave := func(s MarkSet, cid cid.Cid) {
+		t.Helper()
 		has, err := s.Has(cid)
 		if err != nil {
 			t.Fatal(err)
@@ -73,6 +78,7 @@ func testMarkSet(t *testing.T, lsType string) {
 	}

 	mustNotHave := func(s MarkSet, cid cid.Cid) {
+		t.Helper()
 		has, err := s.Has(cid)
 		if err != nil {
 			t.Fatal(err)
@@ -114,12 +120,12 @@ func testMarkSet(t *testing.T, lsType string) {
 		t.Fatal(err)
 	}

-	hotSet, err = env.Create("hot", 0)
+	hotSet, err = env.New("hot", 0)
 	if err != nil {
 		t.Fatal(err)
 	}

-	coldSet, err = env.Create("cold", 0)
+	coldSet, err = env.New("cold", 0)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -150,8 +156,6 @@ func testMarkSet(t *testing.T, lsType string) {
 }

 func testMarkSetVisitor(t *testing.T, lsType string) {
-	t.Helper()
-
 	path, err := ioutil.TempDir("", "markset.*")
 	if err != nil {
 		t.Fatal(err)
@@ -167,7 +171,7 @@ func testMarkSetVisitor(t *testing.T, lsType string) {
 	}
 	defer env.Close() //nolint:errcheck

-	visitor, err := env.Create("test", 0)
+	visitor, err := env.New("test", 0)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -219,3 +223,322 @@ func testMarkSetVisitor(t *testing.T, lsType string) {
 	mustNotVisit(visitor, k3)
 	mustNotVisit(visitor, k4)
 }
+
+func testMarkSetVisitorRecovery(t *testing.T, lsType string) {
+	path, err := ioutil.TempDir("", "markset.*")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	t.Cleanup(func() {
+		_ = os.RemoveAll(path)
+	})
+
+	env, err := OpenMarkSetEnv(path, lsType)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer env.Close() //nolint:errcheck
+
+	visitor, err := env.New("test", 0)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer visitor.Close() //nolint:errcheck
+
+	makeCid := func(key string) cid.Cid {
+		h, err := multihash.Sum([]byte(key), multihash.SHA2_256, -1)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		return cid.NewCidV1(cid.Raw, h)
+	}
+
+	mustVisit := func(v ObjectVisitor, cid cid.Cid) {
+		visit, err := v.Visit(cid)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if !visit {
+			t.Fatal("object should be visited")
+		}
+	}
+
+	mustNotVisit := func(v ObjectVisitor, cid cid.Cid) {
+		visit, err := v.Visit(cid)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if visit {
+			t.Fatal("unexpected visit")
+		}
+	}
+
+	k1 := makeCid("a")
+	k2 := makeCid("b")
+	k3 := makeCid("c")
+	k4 := makeCid("d")
+
+	mustVisit(visitor, k1)
+	mustVisit(visitor, k2)
+
+	if err := visitor.BeginCriticalSection(); err != nil {
+		t.Fatal(err)
+	}
+
+	mustVisit(visitor, k3)
+	mustVisit(visitor, k4)
+
+	mustNotVisit(visitor, k1)
+	mustNotVisit(visitor, k2)
+	mustNotVisit(visitor, k3)
+	mustNotVisit(visitor, k4)
+
+	if err := visitor.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	visitor, err = env.Recover("test")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	mustNotVisit(visitor, k1)
+	mustNotVisit(visitor, k2)
+	mustNotVisit(visitor, k3)
+	mustNotVisit(visitor, k4)
+
+	visitor.EndCriticalSection()
+
+	if err := visitor.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = env.Recover("test")
+	if err == nil {
+		t.Fatal("expected recovery to fail")
+	}
+}
+
+func testMarkSetRecovery(t *testing.T, lsType string) {
+	path, err := ioutil.TempDir("", "markset.*")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	t.Cleanup(func() {
+		_ = os.RemoveAll(path)
+	})
+
+	env, err := OpenMarkSetEnv(path, lsType)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer env.Close() //nolint:errcheck
+
+	markSet, err := env.New("test", 0)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	makeCid := func(key string) cid.Cid {
+		h, err := multihash.Sum([]byte(key), multihash.SHA2_256, -1)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		return cid.NewCidV1(cid.Raw, h)
+	}
+
+	mustHave := func(s MarkSet, cid cid.Cid) {
+		t.Helper()
+		has, err := s.Has(cid)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if !has {
+			t.Fatal("mark not found")
+		}
+	}
+
+	mustNotHave := func(s MarkSet, cid cid.Cid) {
+		t.Helper()
+		has, err := s.Has(cid)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if has {
+			t.Fatal("unexpected mark")
+		}
+	}
+
+	k1 := makeCid("a")
+	k2 := makeCid("b")
+	k3 := makeCid("c")
+	k4 := makeCid("d")
+
+	if err := markSet.Mark(k1); err != nil {
+		t.Fatal(err)
+	}
+	if err := markSet.Mark(k2); err != nil {
+		t.Fatal(err)
+	}
+
+	mustHave(markSet, k1)
+	mustHave(markSet, k2)
+	mustNotHave(markSet, k3)
+	mustNotHave(markSet, k4)
+
+	if err := markSet.BeginCriticalSection(); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := markSet.Mark(k3); err != nil {
+		t.Fatal(err)
+	}
+	if err := markSet.Mark(k4); err != nil {
+		t.Fatal(err)
+	}
+
+	mustHave(markSet, k1)
+	mustHave(markSet, k2)
+	mustHave(markSet, k3)
+	mustHave(markSet, k4)
+
+	if err := markSet.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	markSet, err = env.Recover("test")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	mustHave(markSet, k1)
+	mustHave(markSet, k2)
+	mustHave(markSet, k3)
+	mustHave(markSet, k4)
+
+	markSet.EndCriticalSection()
+
+	if err := markSet.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = env.Recover("test")
+	if err == nil {
+		t.Fatal("expected recovery to fail")
+	}
+}
+
+func testMarkSetMarkMany(t *testing.T, lsType string) {
+	path, err := ioutil.TempDir("", "markset.*")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	t.Cleanup(func() {
+		_ = os.RemoveAll(path)
+	})
+
+	env, err := OpenMarkSetEnv(path, lsType)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer env.Close() //nolint:errcheck
+
+	markSet, err := env.New("test", 0)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	makeCid := func(key string) cid.Cid {
+		h, err := multihash.Sum([]byte(key), multihash.SHA2_256, -1)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		return cid.NewCidV1(cid.Raw, h)
+	}
+
+	mustHave := func(s MarkSet, cid cid.Cid) {
+		t.Helper()
+		has, err := s.Has(cid)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if !has {
+			t.Fatal("mark not found")
+		}
+	}
+
+	mustNotHave := func(s MarkSet, cid cid.Cid) {
+		t.Helper()
+		has, err := s.Has(cid)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if has {
+			t.Fatal("unexpected mark")
+		}
+	}
+
+	k1 := makeCid("a")
+	k2 := makeCid("b")
+	k3 := makeCid("c")
+	k4 := makeCid("d")
+
+	if err := markSet.MarkMany([]cid.Cid{k1, k2}); err != nil {
+		t.Fatal(err)
+	}
+
+	mustHave(markSet, k1)
+	mustHave(markSet, k2)
+	mustNotHave(markSet, k3)
+	mustNotHave(markSet, k4)
+
+	if err := markSet.BeginCriticalSection(); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := markSet.MarkMany([]cid.Cid{k3, k4}); err != nil {
+		t.Fatal(err)
+	}
+
+	mustHave(markSet, k1)
+	mustHave(markSet, k2)
+	mustHave(markSet, k3)
+	mustHave(markSet, k4)
+
+	if err := markSet.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	markSet, err = env.Recover("test")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	mustHave(markSet, k1)
+	mustHave(markSet, k2)
+	mustHave(markSet, k3)
+	mustHave(markSet, k4)
+
+	markSet.EndCriticalSection()
+
+	if err := markSet.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = env.Recover("test")
+	if err == nil {
+		t.Fatal("expected recovery to fail")
+	}
+}
@@ -129,8 +129,6 @@ type SplitStore struct {

 	headChangeMx sync.Mutex

-	coldPurgeSize int
-
 	chain ChainAccessor
 	ds    dstore.Datastore
 	cold  bstore.Blockstore
@@ -158,6 +156,10 @@ type SplitStore struct {
 	txnRefsMx       sync.Mutex
 	txnRefs         map[cid.Cid]struct{}
 	txnMissing      map[cid.Cid]struct{}
+	txnMarkSet      MarkSet
+	txnSyncMx       sync.Mutex
+	txnSyncCond     sync.Cond
+	txnSync         bool

 	// registered protectors
 	protectors []func(func(cid.Cid) error) error
@@ -194,11 +196,10 @@ func Open(path string, ds dstore.Datastore, hot, cold bstore.Blockstore, cfg *Co
 		cold:       cold,
 		hot:        hots,
 		markSetEnv: markSetEnv,
-
-		coldPurgeSize: defaultColdPurgeSize,
 	}

 	ss.txnViewsCond.L = &ss.txnViewsMx
+	ss.txnSyncCond.L = &ss.txnSyncMx
 	ss.ctx, ss.cancel = context.WithCancel(context.Background())

 	if enableDebugLog {
@@ -208,6 +209,14 @@ func Open(path string, ds dstore.Datastore, hot, cold bstore.Blockstore, cfg *Co
 		}
 	}

+	if ss.checkpointExists() {
+		log.Info("found compaction checkpoint; resuming compaction")
+		if err := ss.completeCompaction(); err != nil {
+			markSetEnv.Close() //nolint:errcheck
+			return nil, xerrors.Errorf("error resuming compaction: %w", err)
+		}
+	}
+
 	return ss, nil
 }

@@ -230,6 +239,20 @@ func (s *SplitStore) Has(ctx context.Context, cid cid.Cid) (bool, error) {
 	s.txnLk.RLock()
 	defer s.txnLk.RUnlock()

+	// critical section
+	if s.txnMarkSet != nil {
+		has, err := s.txnMarkSet.Has(cid)
+		if err != nil {
+			return false, err
+		}
+
+		if has {
+			return s.has(cid)
+		}
+
+		return s.cold.Has(ctx, cid)
+	}
+
 	has, err := s.hot.Has(ctx, cid)

 	if err != nil {
@@ -257,6 +280,20 @@ func (s *SplitStore) Get(ctx context.Context, cid cid.Cid) (blocks.Block, error)
 	s.txnLk.RLock()
 	defer s.txnLk.RUnlock()

+	// critical section
+	if s.txnMarkSet != nil {
+		has, err := s.txnMarkSet.Has(cid)
+		if err != nil {
+			return nil, err
+		}
+
+		if has {
+			return s.get(cid)
+		}
+
+		return s.cold.Get(ctx, cid)
+	}
+
 	blk, err := s.hot.Get(ctx, cid)

 	switch err {
@@ -294,6 +331,20 @@ func (s *SplitStore) GetSize(ctx context.Context, cid cid.Cid) (int, error) {
 	s.txnLk.RLock()
 	defer s.txnLk.RUnlock()

+	// critical section
+	if s.txnMarkSet != nil {
+		has, err := s.txnMarkSet.Has(cid)
+		if err != nil {
+			return 0, err
+		}
+
+		if has {
+			return s.getSize(cid)
+		}
+
+		return s.cold.GetSize(ctx, cid)
+	}
+
 	size, err := s.hot.GetSize(ctx, cid)

 	switch err {
@@ -332,6 +383,12 @@ func (s *SplitStore) Put(ctx context.Context, blk blocks.Block) error {

 	s.debug.LogWrite(blk)

+	// critical section
+	if s.txnMarkSet != nil {
+		s.markLiveRefs([]cid.Cid{blk.Cid()})
+		return nil
+	}
+
 	s.trackTxnRef(blk.Cid())
 	return nil
 }
@@ -377,6 +434,12 @@ func (s *SplitStore) PutMany(ctx context.Context, blks []blocks.Block) error {

 	s.debug.LogWriteMany(blks)

+	// critical section
+	if s.txnMarkSet != nil {
+		s.markLiveRefs(batch)
+		return nil
+	}
+
 	s.trackTxnRefMany(batch)
 	return nil
 }
@@ -436,6 +499,23 @@ func (s *SplitStore) View(ctx context.Context, cid cid.Cid, cb func([]byte) erro
 		return cb(data)
 	}

+	// critical section
+	s.txnLk.RLock() // the lock is released in protectView if we are not in critical section
+	if s.txnMarkSet != nil {
+		has, err := s.txnMarkSet.Has(cid)
+		s.txnLk.RUnlock()
+
+		if err != nil {
+			return err
+		}
+
+		if has {
+			return s.view(cid, cb)
+		}
+
+		return s.cold.View(ctx, cid, cb)
+	}
+
 	// views are (optimistically) protected two-fold:
 	// - if there is an active transaction, then the reference is protected.
 	// - if there is no active transaction, active views are tracked in a
@@ -585,6 +665,11 @@ func (s *SplitStore) Close() error {
 	}

 	if atomic.LoadInt32(&s.compacting) == 1 {
+		s.txnSyncMx.Lock()
+		s.txnSync = true
+		s.txnSyncCond.Broadcast()
+		s.txnSyncMx.Unlock()
+
 		log.Warn("close with ongoing compaction in progress; waiting for it to finish...")
 		for atomic.LoadInt32(&s.compacting) == 1 {
 			time.Sleep(time.Second)
@@ -89,7 +89,7 @@ func (s *SplitStore) doCheck(curTs *types.TipSet) error {
 	coldCnt := new(int64)
 	missingCnt := new(int64)

-	visitor, err := s.markSetEnv.Create("check", 0)
+	visitor, err := s.markSetEnv.New("check", 0)
 	if err != nil {
 		return xerrors.Errorf("error creating visitor: %w", err)
 	}
@@ -3,8 +3,9 @@ package splitstore
 import (
 	"bytes"
 	"errors"
+	"os"
+	"path/filepath"
 	"runtime"
-	"sort"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -48,6 +49,10 @@ var (
 	// SyncGapTime is the time delay from a tipset's min timestamp before we decide
 	// there is a sync gap
 	SyncGapTime = time.Minute
+
+	// SyncWaitTime is the time delay from a tipset's min timestamp before we decide
+	// we have synced.
+	SyncWaitTime = 30 * time.Second
 )

 var (
@@ -57,8 +62,6 @@ var (

 const (
 	batchSize = 16384
-
-	defaultColdPurgeSize = 7_000_000
 )

 func (s *SplitStore) HeadChange(_, apply []*types.TipSet) error {
@@ -141,9 +144,9 @@ func (s *SplitStore) isNearUpgrade(epoch abi.ChainEpoch) bool {
 // transactionally protect incoming tipsets
 func (s *SplitStore) protectTipSets(apply []*types.TipSet) {
 	s.txnLk.RLock()
-	defer s.txnLk.RUnlock()

 	if !s.txnActive {
+		s.txnLk.RUnlock()
 		return
 	}

@@ -152,12 +155,115 @@ func (s *SplitStore) protectTipSets(apply []*types.TipSet) {
 		cids = append(cids, ts.Cids()...)
 	}

+	if len(cids) == 0 {
+		s.txnLk.RUnlock()
+		return
+	}
+
+	// critical section
+	if s.txnMarkSet != nil {
+		curTs := apply[len(apply)-1]
+		timestamp := time.Unix(int64(curTs.MinTimestamp()), 0)
+		doSync := time.Since(timestamp) < SyncWaitTime
+		go func() {
+			if doSync {
+				defer func() {
+					s.txnSyncMx.Lock()
+					defer s.txnSyncMx.Unlock()
+					s.txnSync = true
+					s.txnSyncCond.Broadcast()
+				}()
+			}
+			defer s.txnLk.RUnlock()
+			s.markLiveRefs(cids)
+
+		}()
+		return
+	}
+
 	s.trackTxnRefMany(cids)
+	s.txnLk.RUnlock()
+}
+
+func (s *SplitStore) markLiveRefs(cids []cid.Cid) {
+	log.Debugf("marking %d live refs", len(cids))
+	startMark := time.Now()
+
+	count := new(int32)
+	visitor := newConcurrentVisitor()
+	walkObject := func(c cid.Cid) error {
+		return s.walkObjectIncomplete(c, visitor,
+			func(c cid.Cid) error {
+				if isUnitaryObject(c) {
+					return errStopWalk
+				}
+
+				visit, err := s.txnMarkSet.Visit(c)
+				if err != nil {
+					return xerrors.Errorf("error visiting object: %w", err)
+				}
+
+				if !visit {
+					return errStopWalk
+				}
+
+				atomic.AddInt32(count, 1)
+				return nil
+			},
+			func(missing cid.Cid) error {
+				log.Warnf("missing object reference %s in %s", missing, c)
+				return errStopWalk
+			})
+	}
+
+	// optimize the common case of single put
+	if len(cids) == 1 {
+		if err := walkObject(cids[0]); err != nil {
+			log.Errorf("error marking tipset refs: %s", err)
+		}
+		log.Debugw("marking live refs done", "took", time.Since(startMark), "marked", *count)
+		return
+	}
+
+	workch := make(chan cid.Cid, len(cids))
+	for _, c := range cids {
+		workch <- c
+	}
+	close(workch)
+
+	worker := func() error {
+		for c := range workch {
+			if err := walkObject(c); err != nil {
+				return err
+			}
+		}
+
+		return nil
+	}
+
+	workers := runtime.NumCPU() / 2
+	if workers < 2 {
+		workers = 2
+	}
+	if workers > len(cids) {
+		workers = len(cids)
+	}
+
+	g := new(errgroup.Group)
+	for i := 0; i < workers; i++ {
+		g.Go(worker)
+	}
+
+	if err := g.Wait(); err != nil {
+		log.Errorf("error marking tipset refs: %s", err)
+	}
+
+	log.Debugw("marking live refs done", "took", time.Since(startMark), "marked", *count)
 }

 // transactionally protect a view
 func (s *SplitStore) protectView(c cid.Cid) {
-	s.txnLk.RLock()
+	//  the txnLk is held for read
 	defer s.txnLk.RUnlock()

 	if s.txnActive {
@@ -387,6 +493,12 @@ func (s *SplitStore) compact(curTs *types.TipSet) {
 }

 func (s *SplitStore) doCompact(curTs *types.TipSet) error {
+	if s.checkpointExists() {
+		// this really shouldn't happen, but if it somehow does, it means that the hotstore
+		// might be potentially inconsistent; abort compaction and notify the user to intervene.
+		return xerrors.Errorf("checkpoint exists; aborting compaction")
+	}
+
 	currentEpoch := curTs.Height()
 	boundaryEpoch := currentEpoch - CompactionBoundary

@@ -398,7 +510,7 @@ func (s *SplitStore) doCompact(curTs *types.TipSet) error {

 	log.Infow("running compaction", "currentEpoch", currentEpoch, "baseEpoch", s.baseEpoch, "boundaryEpoch", boundaryEpoch, "inclMsgsEpoch", inclMsgsEpoch, "compactionIndex", s.compactionIndex)

-	markSet, err := s.markSetEnv.Create("live", s.markSetSize)
+	markSet, err := s.markSetEnv.New("live", s.markSetSize)
 	if err != nil {
 		return xerrors.Errorf("error creating mark set: %w", err)
 	}
@@ -409,9 +521,6 @@ func (s *SplitStore) doCompact(curTs *types.TipSet) error {
 		return err
 	}

-	// we are ready for concurrent marking
-	s.beginTxnMarking(markSet)
-
 	// 0. track all protected references at beginning of compaction; anything added later should
 	//    be transactionally protected by the write
 	log.Info("protecting references with registered protectors")
@@ -425,7 +534,7 @@ func (s *SplitStore) doCompact(curTs *types.TipSet) error {
 	log.Info("marking reachable objects")
 	startMark := time.Now()

-	var count int64
+	count := new(int64)
 	err = s.walkChain(curTs, boundaryEpoch, inclMsgsEpoch, &noopVisitor{},
 		func(c cid.Cid) error {
 			if isUnitaryObject(c) {
@@ -441,7 +550,7 @@ func (s *SplitStore) doCompact(curTs *types.TipSet) error {
 				return errStopWalk
 			}

-			count++
+			atomic.AddInt64(count, 1)
 			return nil
 		})

@@ -449,9 +558,9 @@ func (s *SplitStore) doCompact(curTs *types.TipSet) error {
 		return xerrors.Errorf("error marking: %w", err)
 	}

-	s.markSetSize = count + count>>2 // overestimate a bit
+	s.markSetSize = *count + *count>>2 // overestimate a bit

-	log.Infow("marking done", "took", time.Since(startMark), "marked", count)
+	log.Infow("marking done", "took", time.Since(startMark), "marked", *count)

 	if err := s.checkClosing(); err != nil {
 		return err
@@ -471,10 +580,15 @@ func (s *SplitStore) doCompact(curTs *types.TipSet) error {
 	log.Info("collecting cold objects")
 	startCollect := time.Now()

+	coldw, err := NewColdSetWriter(s.coldSetPath())
+	if err != nil {
+		return xerrors.Errorf("error creating coldset: %w", err)
+	}
+	defer coldw.Close() //nolint:errcheck
+
 	// some stats for logging
 	var hotCnt, coldCnt int

-	cold := make([]cid.Cid, 0, s.coldPurgeSize)
 	err = s.hot.ForEachKey(func(c cid.Cid) error {
 		// was it marked?
 		mark, err := markSet.Has(c)
@@ -488,7 +602,9 @@ func (s *SplitStore) doCompact(curTs *types.TipSet) error {
 		}

 		// it's cold, mark it as candidate for move
-		cold = append(cold, c)
+		if err := coldw.Write(c); err != nil {
+			return xerrors.Errorf("error writing cid to coldstore: %w", err)
+		}
 		coldCnt++

 		return nil
@@ -498,12 +614,12 @@ func (s *SplitStore) doCompact(curTs *types.TipSet) error {
 		return xerrors.Errorf("error collecting cold objects: %w", err)
 	}

-	log.Infow("cold collection done", "took", time.Since(startCollect))
-
-	if coldCnt > 0 {
-		s.coldPurgeSize = coldCnt + coldCnt>>2 // overestimate a bit
+	if err := coldw.Close(); err != nil {
+		return xerrors.Errorf("error closing coldset: %w", err)
 	}

+	log.Infow("cold collection done", "took", time.Since(startCollect))
+
 	log.Infow("compaction stats", "hot", hotCnt, "cold", coldCnt)
 	stats.Record(s.ctx, metrics.SplitstoreCompactionHot.M(int64(hotCnt)))
 	stats.Record(s.ctx, metrics.SplitstoreCompactionCold.M(int64(coldCnt)))
@@ -521,11 +637,17 @@ func (s *SplitStore) doCompact(curTs *types.TipSet) error {
 		return err
 	}

+	coldr, err := NewColdSetReader(s.coldSetPath())
+	if err != nil {
+		return xerrors.Errorf("error opening coldset: %w", err)
+	}
+	defer coldr.Close() //nolint:errcheck
+
 	// 3. copy the cold objects to the coldstore -- if we have one
 	if !s.cfg.DiscardColdBlocks {
 		log.Info("moving cold objects to the coldstore")
 		startMove := time.Now()
-		err = s.moveColdBlocks(cold)
+		err = s.moveColdBlocks(coldr)
 		if err != nil {
 			return xerrors.Errorf("error moving cold objects: %w", err)
 		}
@@ -534,41 +656,64 @@ func (s *SplitStore) doCompact(curTs *types.TipSet) error {
 		if err := s.checkClosing(); err != nil {
 			return err
 		}
+
+		if err := coldr.Reset(); err != nil {
+			return xerrors.Errorf("error resetting coldset: %w", err)
+		}
 	}

-	// 4. sort cold objects so that the dags with most references are deleted first
-	//    this ensures that we can't refer to a dag with its consituents already deleted, ie
-	//    we lave no dangling references.
-	log.Info("sorting cold objects")
-	startSort := time.Now()
-	err = s.sortObjects(cold)
-	if err != nil {
-		return xerrors.Errorf("error sorting objects: %w", err)
-	}
-	log.Infow("sorting done", "took", time.Since(startSort))
-
-	// 4.1 protect transactional refs once more
-	//     strictly speaking, this is not necessary as purge will do it before deleting each
-	//     batch.  however, there is likely a largish number of references accumulated during
-	//     ths sort and this protects before entering pruge context.
-	err = s.protectTxnRefs(markSet)
-	if err != nil {
-		return xerrors.Errorf("error protecting transactional refs: %w", err)
+	// 4. Purge cold objects with checkpointing for recovery.
+	// This is the critical section of compaction, whereby any cold object not in the markSet is
+	// considered already deleted.
+	// We delete cold objects in batches, holding the transaction lock, where we check the markSet
+	// again for new references created by the VM.
+	// After each batch, we write a checkpoint to disk; if the process is interrupted before completion,
+	// the process will continue from the checkpoint in the next recovery.
+	if err := s.beginCriticalSection(markSet); err != nil {
+		return xerrors.Errorf("error beginning critical section: %w", err)
 	}

 	if err := s.checkClosing(); err != nil {
 		return err
 	}

+	// wait for the head to catch up so that the current tipset is marked
+	s.waitForSync()
+
+	if err := s.checkClosing(); err != nil {
+		return err
+	}
+
+	checkpoint, err := NewCheckpoint(s.checkpointPath())
+	if err != nil {
+		return xerrors.Errorf("error creating checkpoint: %w", err)
+	}
+	defer checkpoint.Close() //nolint:errcheck
+
 	// 5. purge cold objects from the hotstore, taking protected references into account
 	log.Info("purging cold objects from the hotstore")
 	startPurge := time.Now()
-	err = s.purge(cold, markSet)
+	err = s.purge(coldr, checkpoint, markSet)
 	if err != nil {
-		return xerrors.Errorf("error purging cold blocks: %w", err)
+		return xerrors.Errorf("error purging cold objects: %w", err)
 	}
 	log.Infow("purging cold objects from hotstore done", "took", time.Since(startPurge))

+	s.endCriticalSection()
+
+	if err := checkpoint.Close(); err != nil {
+		log.Warnf("error closing checkpoint: %s", err)
+	}
+	if err := os.Remove(s.checkpointPath()); err != nil {
+		log.Warnf("error removing checkpoint: %s", err)
+	}
+	if err := coldr.Close(); err != nil {
+		log.Warnf("error closing coldset: %s", err)
+	}
+	if err := os.Remove(s.coldSetPath()); err != nil {
+		log.Warnf("error removing coldset: %s", err)
+	}
+
 	// we are done; do some housekeeping
 	s.endTxnProtect()
 	s.gcHotstore()
@@ -599,12 +744,51 @@ func (s *SplitStore) beginTxnProtect() {
 	defer s.txnLk.Unlock()

 	s.txnActive = true
+	s.txnSync = false
 	s.txnRefs = make(map[cid.Cid]struct{})
 	s.txnMissing = make(map[cid.Cid]struct{})
 }

-func (s *SplitStore) beginTxnMarking(markSet MarkSet) {
-	log.Info("beginning transactional marking")
+func (s *SplitStore) beginCriticalSection(markSet MarkSet) error {
+	log.Info("beginning critical section")
+
+	// do that once first to get the bulk before the markset is in critical section
+	if err := s.protectTxnRefs(markSet); err != nil {
+		return xerrors.Errorf("error protecting transactional references: %w", err)
+	}
+
+	if err := markSet.BeginCriticalSection(); err != nil {
+		return xerrors.Errorf("error beginning critical section for markset: %w", err)
+	}
+
+	s.txnLk.Lock()
+	defer s.txnLk.Unlock()
+
+	s.txnMarkSet = markSet
+
+	// and do it again while holding the lock to mark references that might have been created
+	// in the meantime and avoid races of the type Has->txnRef->enterCS->Get fails because
+	// it's not in the markset
+	if err := s.protectTxnRefs(markSet); err != nil {
+		return xerrors.Errorf("error protecting transactional references: %w", err)
+	}
+
+	return nil
+}
+
+func (s *SplitStore) waitForSync() {
+	log.Info("waiting for sync")
+	startWait := time.Now()
+	defer func() {
+		log.Infow("waiting for sync done", "took", time.Since(startWait))
+	}()
+
+	s.txnSyncMx.Lock()
+	defer s.txnSyncMx.Unlock()
+
+	for !s.txnSync {
+		s.txnSyncCond.Wait()
+	}
 }

 func (s *SplitStore) endTxnProtect() {
@@ -616,8 +800,20 @@ func (s *SplitStore) endTxnProtect() {
 	}

 	s.txnActive = false
+	s.txnSync = false
 	s.txnRefs = nil
 	s.txnMissing = nil
+	s.txnMarkSet = nil
+}
+
+func (s *SplitStore) endCriticalSection() {
+	log.Info("ending critical section")
+
+	s.txnLk.Lock()
+	defer s.txnLk.Unlock()
+
+	s.txnMarkSet.EndCriticalSection()
+	s.txnMarkSet = nil
 }

 func (s *SplitStore) walkChain(ts *types.TipSet, inclState, inclMsgs abi.ChainEpoch,
@@ -857,7 +1053,7 @@ func (s *SplitStore) walkObjectIncomplete(c cid.Cid, visitor ObjectVisitor, f, m
 	return nil
 }

-// internal version used by walk
+// internal version used during compaction and related operations
 func (s *SplitStore) view(c cid.Cid, cb func([]byte) error) error {
 	if isIdentiyCid(c) {
 		data, err := decodeIdentityCid(c)
@@ -892,10 +1088,34 @@ func (s *SplitStore) has(c cid.Cid) (bool, error) {
 	return s.cold.Has(s.ctx, c)
 }

-func (s *SplitStore) moveColdBlocks(cold []cid.Cid) error {
+func (s *SplitStore) get(c cid.Cid) (blocks.Block, error) {
+	blk, err := s.hot.Get(s.ctx, c)
+	switch err {
+	case nil:
+		return blk, nil
+	case bstore.ErrNotFound:
+		return s.cold.Get(s.ctx, c)
+	default:
+		return nil, err
+	}
+}
+
+func (s *SplitStore) getSize(c cid.Cid) (int, error) {
+	sz, err := s.hot.GetSize(s.ctx, c)
+	switch err {
+	case nil:
+		return sz, nil
+	case bstore.ErrNotFound:
+		return s.cold.GetSize(s.ctx, c)
+	default:
+		return 0, err
+	}
+}
+
+func (s *SplitStore) moveColdBlocks(coldr *ColdSetReader) error {
 	batch := make([]blocks.Block, 0, batchSize)

-	for _, c := range cold {
+	err := coldr.ForEach(func(c cid.Cid) error {
 		if err := s.checkClosing(); err != nil {
 			return err
 		}
@@ -904,7 +1124,7 @@ func (s *SplitStore) moveColdBlocks(cold []cid.Cid) error {
 		if err != nil {
 			if err == bstore.ErrNotFound {
 				log.Warnf("hotstore missing block %s", c)
-				continue
+				return nil
 			}

 			return xerrors.Errorf("error retrieving block %s from hotstore: %w", c, err)
@@ -918,6 +1138,12 @@ func (s *SplitStore) moveColdBlocks(cold []cid.Cid) error {
 			}
 			batch = batch[:0]
 		}
+
+		return nil
+	})
+
+	if err != nil {
+		return xerrors.Errorf("error iterating coldset: %w", err)
 	}

 	if len(batch) > 0 {
@@ -930,177 +1156,202 @@ func (s *SplitStore) moveColdBlocks(cold []cid.Cid) error {
 	return nil
 }

-// sorts a slice of objects heaviest first -- it's a little expensive but worth the
-// guarantee that we don't leave dangling references behind, e.g. if we die in the middle
-// of a purge.
-func (s *SplitStore) sortObjects(cids []cid.Cid) error {
-	// we cache the keys to avoid making a gazillion of strings
-	keys := make(map[cid.Cid]string)
-	key := func(c cid.Cid) string {
-		s, ok := keys[c]
-		if !ok {
-			s = string(c.Hash())
-			keys[c] = s
-		}
-		return s
-	}
-
-	// compute sorting weights as the cumulative number of DAG links
-	weights := make(map[string]int)
-	for _, c := range cids {
-		// this can take quite a while, so check for shutdown with every opportunity
-		if err := s.checkClosing(); err != nil {
-			return err
-		}
-
-		w := s.getObjectWeight(c, weights, key)
-		weights[key(c)] = w
-	}
-
-	// sort!
-	sort.Slice(cids, func(i, j int) bool {
-		wi := weights[key(cids[i])]
-		wj := weights[key(cids[j])]
-		if wi == wj {
-			return bytes.Compare(cids[i].Hash(), cids[j].Hash()) > 0
-		}
-
-		return wi > wj
-	})
-
-	return nil
-}
-
-func (s *SplitStore) getObjectWeight(c cid.Cid, weights map[string]int, key func(cid.Cid) string) int {
-	w, ok := weights[key(c)]
-	if ok {
-		return w
-	}
-
-	// we treat block headers specially to avoid walking the entire chain
-	var hdr types.BlockHeader
-	err := s.view(c, func(data []byte) error {
-		return hdr.UnmarshalCBOR(bytes.NewBuffer(data))
-	})
-	if err == nil {
-		w1 := s.getObjectWeight(hdr.ParentStateRoot, weights, key)
-		weights[key(hdr.ParentStateRoot)] = w1
-
-		w2 := s.getObjectWeight(hdr.Messages, weights, key)
-		weights[key(hdr.Messages)] = w2
-
-		return 1 + w1 + w2
-	}
-
-	var links []cid.Cid
-	err = s.view(c, func(data []byte) error {
-		return cbg.ScanForLinks(bytes.NewReader(data), func(c cid.Cid) {
-			links = append(links, c)
-		})
-	})
-	if err != nil {
-		return 1
-	}
-
-	w = 1
-	for _, c := range links {
-		// these are internal refs, so dags will be dags
-		if c.Prefix().Codec != cid.DagCBOR {
-			w++
-			continue
-		}
-
-		wc := s.getObjectWeight(c, weights, key)
-		weights[key(c)] = wc
-
-		w += wc
-	}
-
-	return w
-}
-
-func (s *SplitStore) purgeBatch(cids []cid.Cid, deleteBatch func([]cid.Cid) error) error {
-	if len(cids) == 0 {
-		return nil
-	}
-
-	// we don't delete one giant batch of millions of objects, but rather do smaller batches
-	// so that we don't stop the world for an extended period of time
-	done := false
-	for i := 0; !done; i++ {
-		start := i * batchSize
-		end := start + batchSize
-		if end >= len(cids) {
-			end = len(cids)
-			done = true
-		}
-
-		err := deleteBatch(cids[start:end])
-		if err != nil {
-			return xerrors.Errorf("error deleting batch: %w", err)
-		}
-	}
-
-	return nil
-}
-
-func (s *SplitStore) purge(cids []cid.Cid, markSet MarkSet) error {
+func (s *SplitStore) purge(coldr *ColdSetReader, checkpoint *Checkpoint, markSet MarkSet) error {
+	batch := make([]cid.Cid, 0, batchSize)
 	deadCids := make([]cid.Cid, 0, batchSize)
+
 	var purgeCnt, liveCnt int
 	defer func() {
 		log.Infow("purged cold objects", "purged", purgeCnt, "live", liveCnt)
 	}()

-	return s.purgeBatch(cids,
-		func(cids []cid.Cid) error {
-			deadCids := deadCids[:0]
+	deleteBatch := func() error {
+		pc, lc, err := s.purgeBatch(batch, deadCids, checkpoint, markSet)

-			for {
-				if err := s.checkClosing(); err != nil {
-					return err
-				}
+		purgeCnt += pc
+		liveCnt += lc
+		batch = batch[:0]

-				s.txnLk.Lock()
-				if len(s.txnRefs) == 0 {
-					// keep the lock!
-					break
-				}
+		return err
+	}

-				// unlock and protect
-				s.txnLk.Unlock()
+	err := coldr.ForEach(func(c cid.Cid) error {
+		batch = append(batch, c)
+		if len(batch) == batchSize {
+			return deleteBatch()
+		}

-				err := s.protectTxnRefs(markSet)
-				if err != nil {
-					return xerrors.Errorf("error protecting transactional refs: %w", err)
-				}
+		return nil
+	})
+
+	if err != nil {
+		return err
+	}
+
+	if len(batch) > 0 {
+		return deleteBatch()
+	}
+
+	return nil
+}
+
+func (s *SplitStore) purgeBatch(batch, deadCids []cid.Cid, checkpoint *Checkpoint, markSet MarkSet) (purgeCnt int, liveCnt int, err error) {
+	if err := s.checkClosing(); err != nil {
+		return 0, 0, err
+	}
+
+	s.txnLk.Lock()
+	defer s.txnLk.Unlock()
+
+	for _, c := range batch {
+		has, err := markSet.Has(c)
+		if err != nil {
+			return 0, 0, xerrors.Errorf("error checking markset for liveness: %w", err)
+		}
+
+		if has {
+			liveCnt++
+			continue
+		}
+
+		deadCids = append(deadCids, c)
+	}
+
+	if len(deadCids) == 0 {
+		if err := checkpoint.Set(batch[len(batch)-1]); err != nil {
+			return 0, 0, xerrors.Errorf("error setting checkpoint: %w", err)
+		}
+
+		return 0, liveCnt, nil
+	}
+
+	if err := s.hot.DeleteMany(s.ctx, deadCids); err != nil {
+		return 0, liveCnt, xerrors.Errorf("error purging cold objects: %w", err)
+	}
+
+	s.debug.LogDelete(deadCids)
+	purgeCnt = len(deadCids)
+
+	if err := checkpoint.Set(batch[len(batch)-1]); err != nil {
+		return purgeCnt, liveCnt, xerrors.Errorf("error setting checkpoint: %w", err)
+	}
+
+	return purgeCnt, liveCnt, nil
+}
+
+func (s *SplitStore) coldSetPath() string {
+	return filepath.Join(s.path, "coldset")
+}
+
+func (s *SplitStore) checkpointPath() string {
+	return filepath.Join(s.path, "checkpoint")
+}
+
+func (s *SplitStore) checkpointExists() bool {
+	_, err := os.Stat(s.checkpointPath())
+	return err == nil
+}
+
+func (s *SplitStore) completeCompaction() error {
+	checkpoint, last, err := OpenCheckpoint(s.checkpointPath())
+	if err != nil {
+		return xerrors.Errorf("error opening checkpoint: %w", err)
+	}
+	defer checkpoint.Close() //nolint:errcheck
+
+	coldr, err := NewColdSetReader(s.coldSetPath())
+	if err != nil {
+		return xerrors.Errorf("error opening coldset: %w", err)
+	}
+	defer coldr.Close() //nolint:errcheck
+
+	markSet, err := s.markSetEnv.Recover("live")
+	if err != nil {
+		return xerrors.Errorf("error recovering markset: %w", err)
+	}
+	defer markSet.Close() //nolint:errcheck
+
+	// PURGE
+	log.Info("purging cold objects from the hotstore")
+	startPurge := time.Now()
+	err = s.completePurge(coldr, checkpoint, last, markSet)
+	if err != nil {
+		return xerrors.Errorf("error purging cold objects: %w", err)
+	}
+	log.Infow("purging cold objects from hotstore done", "took", time.Since(startPurge))
+
+	markSet.EndCriticalSection()
+
+	if err := checkpoint.Close(); err != nil {
+		log.Warnf("error closing checkpoint: %s", err)
+	}
+	if err := os.Remove(s.checkpointPath()); err != nil {
+		log.Warnf("error removing checkpoint: %s", err)
+	}
+	if err := coldr.Close(); err != nil {
+		log.Warnf("error closing coldset: %s", err)
+	}
+	if err := os.Remove(s.coldSetPath()); err != nil {
+		log.Warnf("error removing coldset: %s", err)
+	}
+
+	// Note: at this point we can start the splitstore; a compaction should run on
+	//       the first head change, which will trigger gc on the hotstore.
+	//       We don't mind the second (back-to-back) compaction as the head will
+	//       have advanced during marking and coldset accumulation.
+	return nil
+}
+
+func (s *SplitStore) completePurge(coldr *ColdSetReader, checkpoint *Checkpoint, start cid.Cid, markSet MarkSet) error {
+	if !start.Defined() {
+		return s.purge(coldr, checkpoint, markSet)
+	}
+
+	seeking := true
+	batch := make([]cid.Cid, 0, batchSize)
+	deadCids := make([]cid.Cid, 0, batchSize)
+
+	var purgeCnt, liveCnt int
+	defer func() {
+		log.Infow("purged cold objects", "purged", purgeCnt, "live", liveCnt)
+	}()
+
+	deleteBatch := func() error {
+		pc, lc, err := s.purgeBatch(batch, deadCids, checkpoint, markSet)
+
+		purgeCnt += pc
+		liveCnt += lc
+		batch = batch[:0]
+
+		return err
+	}
+
+	err := coldr.ForEach(func(c cid.Cid) error {
+		if seeking {
+			if start.Equals(c) {
+				seeking = false
 			}

-			defer s.txnLk.Unlock()
-
-			for _, c := range cids {
-				live, err := markSet.Has(c)
-				if err != nil {
-					return xerrors.Errorf("error checking for liveness: %w", err)
-				}
-
-				if live {
-					liveCnt++
-					continue
-				}
-
-				deadCids = append(deadCids, c)
-			}
-
-			err := s.hot.DeleteMany(s.ctx, deadCids)
-			if err != nil {
-				return xerrors.Errorf("error purging cold objects: %w", err)
-			}
-
-			s.debug.LogDelete(deadCids)
-
-			purgeCnt += len(deadCids)
 			return nil
-		})
+		}
+
+		batch = append(batch, c)
+		if len(batch) == batchSize {
+			return deleteBatch()
+		}
+
+		return nil
+	})
+
+	if err != nil {
+		return err
+	}
+
+	if len(batch) > 0 {
+		return deleteBatch()
+	}
+
+	return nil
 }

 // I really don't like having this code, but we seem to have some occasional DAG references with
@@ -4,6 +4,8 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"io/ioutil"
+	"os"
 	"sync"
 	"sync/atomic"
 	"testing"
@@ -20,12 +22,14 @@ import (
 	datastore "github.com/ipfs/go-datastore"
 	dssync "github.com/ipfs/go-datastore/sync"
 	logging "github.com/ipfs/go-log/v2"
+	mh "github.com/multiformats/go-multihash"
 )

 func init() {
 	CompactionThreshold = 5
 	CompactionBoundary = 2
 	WarmupBoundary = 0
+	SyncWaitTime = time.Millisecond
 	logging.SetLogLevel("splitstore", "DEBUG")
 }

@@ -80,8 +84,17 @@ func testSplitStore(t *testing.T, cfg *Config) {
 		t.Fatal(err)
 	}

+	path, err := ioutil.TempDir("", "splitstore.*")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	t.Cleanup(func() {
+		_ = os.RemoveAll(path)
+	})
+
 	// open the splitstore
-	ss, err := Open("", ds, hot, cold, cfg)
+	ss, err := Open(path, ds, hot, cold, cfg)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -125,6 +138,10 @@ func testSplitStore(t *testing.T, cfg *Config) {
 	}

 	waitForCompaction := func() {
+		ss.txnSyncMx.Lock()
+		ss.txnSync = true
+		ss.txnSyncCond.Broadcast()
+		ss.txnSyncMx.Unlock()
 		for atomic.LoadInt32(&ss.compacting) == 1 {
 			time.Sleep(100 * time.Millisecond)
 		}
@@ -259,8 +276,17 @@ func TestSplitStoreSuppressCompactionNearUpgrade(t *testing.T) {
 		t.Fatal(err)
 	}

+	path, err := ioutil.TempDir("", "splitstore.*")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	t.Cleanup(func() {
+		_ = os.RemoveAll(path)
+	})
+
 	// open the splitstore
-	ss, err := Open("", ds, hot, cold, &Config{MarkSetType: "map"})
+	ss, err := Open(path, ds, hot, cold, &Config{MarkSetType: "map"})
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -305,6 +331,10 @@ func TestSplitStoreSuppressCompactionNearUpgrade(t *testing.T) {
 	}

 	waitForCompaction := func() {
+		ss.txnSyncMx.Lock()
+		ss.txnSync = true
+		ss.txnSyncCond.Broadcast()
+		ss.txnSyncMx.Unlock()
 		for atomic.LoadInt32(&ss.compacting) == 1 {
 			time.Sleep(100 * time.Millisecond)
 		}
@@ -426,17 +456,25 @@ func (c *mockChain) SubscribeHeadChanges(change func(revert []*types.TipSet, app

 type mockStore struct {
 	mx  sync.Mutex
-	set map[cid.Cid]blocks.Block
+	set map[string]blocks.Block
 }

 func newMockStore() *mockStore {
-	return &mockStore{set: make(map[cid.Cid]blocks.Block)}
+	return &mockStore{set: make(map[string]blocks.Block)}
+}
+
+func (b *mockStore) keyOf(c cid.Cid) string {
+	return string(c.Hash())
+}
+
+func (b *mockStore) cidOf(k string) cid.Cid {
+	return cid.NewCidV1(cid.Raw, mh.Multihash([]byte(k)))
 }

 func (b *mockStore) Has(_ context.Context, cid cid.Cid) (bool, error) {
 	b.mx.Lock()
 	defer b.mx.Unlock()
-	_, ok := b.set[cid]
+	_, ok := b.set[b.keyOf(cid)]
 	return ok, nil
 }

@@ -446,7 +484,7 @@ func (b *mockStore) Get(_ context.Context, cid cid.Cid) (blocks.Block, error) {
 	b.mx.Lock()
 	defer b.mx.Unlock()

-	blk, ok := b.set[cid]
+	blk, ok := b.set[b.keyOf(cid)]
 	if !ok {
 		return nil, blockstore.ErrNotFound
 	}
@@ -474,7 +512,7 @@ func (b *mockStore) Put(_ context.Context, blk blocks.Block) error {
 	b.mx.Lock()
 	defer b.mx.Unlock()

-	b.set[blk.Cid()] = blk
+	b.set[b.keyOf(blk.Cid())] = blk
 	return nil
 }

@@ -483,7 +521,7 @@ func (b *mockStore) PutMany(_ context.Context, blks []blocks.Block) error {
 	defer b.mx.Unlock()

 	for _, blk := range blks {
-		b.set[blk.Cid()] = blk
+		b.set[b.keyOf(blk.Cid())] = blk
 	}
 	return nil
 }
@@ -492,7 +530,7 @@ func (b *mockStore) DeleteBlock(_ context.Context, cid cid.Cid) error {
 	b.mx.Lock()
 	defer b.mx.Unlock()

-	delete(b.set, cid)
+	delete(b.set, b.keyOf(cid))
 	return nil
 }

@@ -501,7 +539,7 @@ func (b *mockStore) DeleteMany(_ context.Context, cids []cid.Cid) error {
 	defer b.mx.Unlock()

 	for _, c := range cids {
-		delete(b.set, c)
+		delete(b.set, b.keyOf(c))
 	}
 	return nil
 }
@@ -515,7 +553,7 @@ func (b *mockStore) ForEachKey(f func(cid.Cid) error) error {
 	defer b.mx.Unlock()

 	for c := range b.set {
-		err := f(c)
+		err := f(b.cidOf(c))
 		if err != nil {
 			return err
 		}
@@ -62,7 +62,7 @@ func (s *SplitStore) doWarmup(curTs *types.TipSet) error {
 	xcount := new(int64)
 	missing := new(int64)

-	visitor, err := s.markSetEnv.Create("warmup", 0)
+	visitor, err := s.markSetEnv.New("warmup", 0)
 	if err != nil {
 		return xerrors.Errorf("error creating visitor: %w", err)
 	}
@@ -1,2 +1,2 @@
-/dns4/bootstrap-0.butterfly.fildev.network/tcp/1347/p2p/12D3KooWBdRCBLUeKvoy22u5DcXs61adFn31v8WWCZgmBjDCjbsC
-/dns4/bootstrap-1.butterfly.fildev.network/tcp/1347/p2p/12D3KooWDUQJBA18njjXnG9RtLxoN3muvdU7PEy55QorUEsdAqdy
+/dns4/bootstrap-0.butterfly.fildev.network/tcp/1347/p2p/12D3KooWFHDtFx7CVTy4xoCDutVo1cScvSnQjDeaM8UzwVS1qwkh
+/dns4/bootstrap-1.butterfly.fildev.network/tcp/1347/p2p/12D3KooWKt8cwpkiumkT8x32c3YFxsPRwhV5J8hCYPn9mhUmcAXt
@@ -42,8 +42,7 @@ const UpgradeTurboHeight = -15
 const UpgradeHyperdriveHeight = -16
 const UpgradeChocolateHeight = -17

-// 2022-01-17T19:00:00Z
-const UpgradeOhSnapHeight = 30262
+const UpgradeOhSnapHeight = 240

 func init() {
 	policy.SetConsensusMinerMinPower(abi.NewStoragePower(2 << 30))
@@ -54,7 +54,8 @@ const UpgradeHyperdriveHeight = 420

 const UpgradeChocolateHeight = 312746

-const UpgradeOhSnapHeight = 99999999
+// 2022-02-10T19:23:00Z
+const UpgradeOhSnapHeight = 682006

 func init() {
 	policy.SetConsensusMinerMinPower(abi.NewStoragePower(32 << 30))
@@ -1,4 +1,54 @@
 {
+  "v28-empty-sector-update-merkletree-poseidon_hasher-8-0-0-61fa69f38b9cc771ba27b670124714b4ea77fbeae05e377fb859c4a43b73a30c.params": {
+    "cid": "Qma5WL6abSqYg9uUQAZ3EHS286bsNsha7oAGsJBD48Bq2q",
+    "digest": "c3ad7bb549470b82ad52ed070aebb4f4",
+    "sector_size": 536870912
+  },
+  "v28-empty-sector-update-merkletree-poseidon_hasher-8-0-0-61fa69f38b9cc771ba27b670124714b4ea77fbeae05e377fb859c4a43b73a30c.vk": {
+    "cid": "QmUa7f9JtJMsqJJ3s3ZXk6WyF4xJLE8FiqYskZGgk8GCDv",
+    "digest": "994c5b7d450ca9da348c910689f2dc7f",
+    "sector_size": 536870912
+  },
+  "v28-empty-sector-update-merkletree-poseidon_hasher-8-0-0-92180959e1918d26350b8e6cfe217bbdd0a2d8de51ebec269078b364b715ad63.params": {
+    "cid": "QmQiT4qBGodrVNEgVTDXxBNDdPbaD8Ag7Sx3ZTq1zHX79S",
+    "digest": "5aedd2cf3e5c0a15623d56a1b43110ad",
+    "sector_size": 8388608
+  },
+  "v28-empty-sector-update-merkletree-poseidon_hasher-8-0-0-92180959e1918d26350b8e6cfe217bbdd0a2d8de51ebec269078b364b715ad63.vk": {
+    "cid": "QmdcpKUQvHM8RFRVKbk1yHfEqMcBzhtFWKRp9SNEmWq37i",
+    "digest": "abd80269054d391a734febdac0d2e687",
+    "sector_size": 8388608
+  },
+  "v28-empty-sector-update-merkletree-poseidon_hasher-8-0-0-fb9e095bebdd77511c0269b967b4d87ba8b8a525edaa0e165de23ba454510194.params": {
+    "cid": "QmYM6Hg7mjmvA3ZHTsqkss1fkdyDju5dDmLiBZGJ5pz9y9",
+    "digest": "311f92a3e75036ced01b1c0025f1fa0c",
+    "sector_size": 2048
+  },
+  "v28-empty-sector-update-merkletree-poseidon_hasher-8-0-0-fb9e095bebdd77511c0269b967b4d87ba8b8a525edaa0e165de23ba454510194.vk": {
+    "cid": "QmaQsTLL3nc5dw6wAvaioJSBfd1jhQrA2o6ucFf7XeV74P",
+    "digest": "eadad9784969890d30f2749708c79771",
+    "sector_size": 2048
+  },
+  "v28-empty-sector-update-merkletree-poseidon_hasher-8-8-0-3b7f44a9362e3985369454947bc94022e118211e49fd672d52bec1cbfd599d18.params": {
+    "cid": "QmNPc75iEfcahCwNKdqnWLtxnjspUGGR4iscjiz3wP3RtS",
+    "digest": "1b3cfd761a961543f9eb273e435a06a2",
+    "sector_size": 34359738368
+  },
+  "v28-empty-sector-update-merkletree-poseidon_hasher-8-8-0-3b7f44a9362e3985369454947bc94022e118211e49fd672d52bec1cbfd599d18.vk": {
+    "cid": "QmdFFUe1gcz9MMHc6YW8aoV48w4ckvcERjt7PkydQAMfCN",
+    "digest": "3a6941983754737fde880d29c7094905",
+    "sector_size": 34359738368
+  },
+  "v28-empty-sector-update-merkletree-poseidon_hasher-8-8-2-102e1444a7e9a97ebf1e3d6855dcc77e66c011ea66f936d9b2c508f87f2f83a7.params": {
+    "cid": "QmUB6xTVjzBQGuDNeyJMrrJ1byk58vhPm8eY2Lv9pgwanp",
+    "digest": "1a392e7b759fb18e036c7559b5ece816",
+    "sector_size": 68719476736
+  },
+  "v28-empty-sector-update-merkletree-poseidon_hasher-8-8-2-102e1444a7e9a97ebf1e3d6855dcc77e66c011ea66f936d9b2c508f87f2f83a7.vk": {
+    "cid": "Qmd794Jty7k26XJ8Eg4NDEks65Qk8G4GVfGkwqvymv8HAg",
+    "digest": "80e366df2f1011953c2d01c7b7c9ee8e",
+    "sector_size": 68719476736
+  },
  "v28-proof-of-spacetime-fallback-merkletree-poseidon_hasher-8-0-0-0170db1f394b35d995252228ee359194b13199d259380541dc529fb0099096b0.params": {
    "cid": "QmVxjFRyhmyQaZEtCh7nk2abc7LhFkzhnRX4rcHqCCpikR",
    "digest": "7610b9f82bfc88405b7a832b651ce2f6",
@@ -37,7 +37,7 @@ func BuildTypeString() string {
 }

 // BuildVersion is the local build version
-const BuildVersion = "1.15.0-dev"
+const BuildVersion = "1.15.0-rc1"

 func UserVersion() string {
 	if os.Getenv("LOTUS_VERSION_IGNORE_COMMIT") == "1" {
@@ -142,7 +142,7 @@ func (db *DrandBeacon) Entry(ctx context.Context, round uint64) <-chan beacon.Re

 	go func() {
 		start := build.Clock.Now()
-		log.Infow("start fetching randomness", "round", round)
+		log.Debugw("start fetching randomness", "round", round)
 		resp, err := db.client.Get(ctx, round)

 		var br beacon.Response
@@ -152,7 +152,7 @@ func (db *DrandBeacon) Entry(ctx context.Context, round uint64) <-chan beacon.Re
 			br.Entry.Round = resp.Round()
 			br.Entry.Data = resp.Signature()
 		}
-		log.Infow("done fetching randomness", "round", round, "took", build.Clock.Since(start))
+		log.Debugw("done fetching randomness", "round", round, "took", build.Clock.Since(start))
 		out <- br
 		close(out)
 	}()
@@ -466,6 +466,7 @@ var stateOrder = map[sealing.SectorState]stateMeta{}
 var stateList = []stateMeta{
 	{col: 39, state: "Total"},
 	{col: color.FgGreen, state: sealing.Proving},
+	{col: color.FgGreen, state: sealing.UpdateActivating},

 	{col: color.FgBlue, state: sealing.Empty},
 	{col: color.FgBlue, state: sealing.WaitDeals},
@@ -496,6 +497,7 @@ var stateList = []stateMeta{
 	{col: color.FgYellow, state: sealing.SubmitReplicaUpdate},
 	{col: color.FgYellow, state: sealing.ReplicaUpdateWait},
 	{col: color.FgYellow, state: sealing.FinalizeReplicaUpdate},
+	{col: color.FgYellow, state: sealing.ReleaseSectorKey},

 	{col: color.FgCyan, state: sealing.Terminating},
 	{col: color.FgCyan, state: sealing.TerminateWait},
@@ -524,6 +526,7 @@ var stateList = []stateMeta{
 	{col: color.FgRed, state: sealing.SnapDealsAddPieceFailed},
 	{col: color.FgRed, state: sealing.SnapDealsDealsExpired},
 	{col: color.FgRed, state: sealing.ReplicaUpdateFailed},
+	{col: color.FgRed, state: sealing.ReleaseSectorKeyFailed},
 }

 func init() {
@@ -55,6 +55,7 @@ var sectorsCmd = &cli.Command{
 		sectorsTerminateCmd,
 		sectorsRemoveCmd,
 		sectorsSnapUpCmd,
+		sectorsSnapAbortCmd,
 		sectorsMarkForUpgradeCmd,
 		sectorsStartSealCmd,
 		sectorsSealDelayCmd,
@@ -1520,6 +1521,31 @@ var sectorsSnapUpCmd = &cli.Command{
 	},
 }

+var sectorsSnapAbortCmd = &cli.Command{
+	Name:      "abort-upgrade",
+	Usage:     "Abort the attempted (SnapDeals) upgrade of a CC sector, reverting it to as before",
+	ArgsUsage: "<sectorNum>",
+	Action: func(cctx *cli.Context) error {
+		if cctx.Args().Len() != 1 {
+			return lcli.ShowHelp(cctx, xerrors.Errorf("must pass sector number"))
+		}
+
+		nodeApi, closer, err := lcli.GetStorageMinerAPI(cctx)
+		if err != nil {
+			return err
+		}
+		defer closer()
+		ctx := lcli.ReqContext(cctx)
+
+		id, err := strconv.ParseUint(cctx.Args().Get(0), 10, 64)
+		if err != nil {
+			return xerrors.Errorf("could not parse sector number: %w", err)
+		}
+
+		return nodeApi.SectorAbortUpgrade(ctx, abi.SectorNumber(id))
+	},
+}
+
 var sectorsMarkForUpgradeCmd = &cli.Command{
 	Name:      "mark-for-upgrade",
 	Usage:     "Mark a committed capacity sector for replacement by a sector with deals",
@@ -261,7 +261,7 @@ var runCmd = &cli.Command{

 		var taskTypes []sealtasks.TaskType

-		taskTypes = append(taskTypes, sealtasks.TTFetch, sealtasks.TTCommit1, sealtasks.TTProveReplicaUpdate1, sealtasks.TTFinalize)
+		taskTypes = append(taskTypes, sealtasks.TTFetch, sealtasks.TTCommit1, sealtasks.TTProveReplicaUpdate1, sealtasks.TTFinalize, sealtasks.TTFinalizeReplicaUpdate)

 		if cctx.Bool("addpiece") {
 			taskTypes = append(taskTypes, sealtasks.TTAddPiece)
@@ -4,10 +4,12 @@ import (
 	"encoding/json"
 	corebig "math/big"
 	"os"
+	"strconv"

 	"github.com/filecoin-project/go-address"
 	"github.com/filecoin-project/go-state-types/abi"
 	filbig "github.com/filecoin-project/go-state-types/big"
+	"github.com/filecoin-project/lotus/chain/types"
 	lcli "github.com/filecoin-project/lotus/cli"
 	"github.com/ipfs/go-cid"
 	"github.com/urfave/cli/v2"
@@ -22,29 +24,50 @@ type networkTotalsOutput struct {
 	Payload  networkTotals `json:"payload"`
 }

-type networkTotals struct {
-	QaNetworkPower       filbig.Int `json:"total_qa_power"`
-	RawNetworkPower      filbig.Int `json:"total_raw_capacity"`
-	CapacityCarryingData float64    `json:"capacity_fraction_carrying_data"`
-	UniqueCids           int        `json:"total_unique_cids"`
-	UniqueProviders      int        `json:"total_unique_providers"`
-	UniqueClients        int        `json:"total_unique_clients"`
+type providerMeta struct {
+	nonidentifiable bool
+}
+
+// force formatting as decimal to aid human readers
+type humanFloat float64
+
+func (f humanFloat) MarshalJSON() ([]byte, error) {
+	// 'f' uses decimal digits without exponents.
+	// The bit size of 32 ensures we don't use too many decimal places.
+	return []byte(strconv.FormatFloat(float64(f), 'f', -1, 32)), nil
+}
+
+type Totals struct {
 	TotalDeals           int        `json:"total_num_deals"`
 	TotalBytes           int64      `json:"total_stored_data_size"`
-	FilplusTotalDeals    int        `json:"filplus_total_num_deals"`
-	FilplusTotalBytes    int64      `json:"filplus_total_stored_data_size"`
+	PrivateTotalDeals    int        `json:"private_total_num_deals"`
+	PrivateTotalBytes    int64      `json:"private_total_stored_data_size"`
+	CapacityCarryingData humanFloat `json:"capacity_fraction_carrying_data"`
+}

-	seenClient   map[address.Address]bool
-	seenProvider map[address.Address]bool
-	seenPieceCid map[cid.Cid]bool
+type networkTotals struct {
+	QaNetworkPower         filbig.Int `json:"total_qa_power"`
+	RawNetworkPower        filbig.Int `json:"total_raw_capacity"`
+	UniqueCids             int        `json:"total_unique_cids"`
+	UniqueBytes            int64      `json:"total_unique_data_size"`
+	UniqueClients          int        `json:"total_unique_clients"`
+	UniqueProviders        int        `json:"total_unique_providers"`
+	UniquePrivateProviders int        `json:"total_unique_private_providers"`
+	Totals
+	FilPlus Totals `json:"filecoin_plus_subset"`
+
+	pieces    map[cid.Cid]struct{}
+	clients   map[address.Address]struct{}
+	providers map[address.Address]providerMeta
 }

 var storageStatsCmd = &cli.Command{
 	Name:  "storage-stats",
 	Usage: "Translates current lotus state into a json summary suitable for driving https://storage.filecoin.io/",
 	Flags: []cli.Flag{
-		&cli.Int64Flag{
-			Name: "height",
+		&cli.StringFlag{
+			Name:  "tipset",
+			Usage: "Comma separated array of cids, or @height",
 		},
 	},
 	Action: func(cctx *cli.Context) error {
@@ -56,22 +79,24 @@ var storageStatsCmd = &cli.Command{
 		}
 		defer apiCloser()

-		head, err := api.ChainHead(ctx)
-		if err != nil {
-			return err
-		}
-
-		requestedHeight := cctx.Int64("height")
-		if requestedHeight > 0 {
-			head, err = api.ChainGetTipSetByHeight(ctx, abi.ChainEpoch(requestedHeight), head.Key())
+		var ts *types.TipSet
+		if cctx.String("tipset") == "" {
+			ts, err = api.ChainHead(ctx)
+			if err != nil {
+				return err
+			}
+			ts, err = api.ChainGetTipSetByHeight(ctx, ts.Height()-defaultEpochLookback, ts.Key())
+			if err != nil {
+				return err
+			}
 		} else {
-			head, err = api.ChainGetTipSetByHeight(ctx, head.Height()-defaultEpochLookback, head.Key())
-		}
-		if err != nil {
-			return err
+			ts, err = lcli.ParseTipSetRef(ctx, api, cctx.String("tipset"))
+			if err != nil {
+				return err
+			}
 		}

-		power, err := api.StateMinerPower(ctx, address.Address{}, head.Key())
+		power, err := api.StateMinerPower(ctx, address.Address{}, ts.Key())
 		if err != nil {
 			return err
 		}
@@ -79,12 +104,12 @@ var storageStatsCmd = &cli.Command{
 		netTotals := networkTotals{
 			QaNetworkPower:  power.TotalPower.QualityAdjPower,
 			RawNetworkPower: power.TotalPower.RawBytePower,
-			seenClient:      make(map[address.Address]bool),
-			seenProvider:    make(map[address.Address]bool),
-			seenPieceCid:    make(map[cid.Cid]bool),
+			pieces:          make(map[cid.Cid]struct{}),
+			clients:         make(map[address.Address]struct{}),
+			providers:       make(map[address.Address]providerMeta),
 		}

-		deals, err := api.StateMarketDeals(ctx, head.Key())
+		deals, err := api.StateMarketDeals(ctx, ts.Key())
 		if err != nil {
 			return err
 		}
@@ -94,35 +119,76 @@ var storageStatsCmd = &cli.Command{
 			// Only count deals that have properly started, not past/future ones
 			// https://github.com/filecoin-project/specs-actors/blob/v0.9.9/actors/builtin/market/deal.go#L81-L85
 			// Bail on 0 as well in case SectorStartEpoch is uninitialized due to some bug
+			//
+			// Additionally if the SlashEpoch is set this means the underlying sector is
+			// terminated for whatever reason ( not just slashed ), and the deal record
+			// will soon be removed from the state entirely
 			if dealInfo.State.SectorStartEpoch <= 0 ||
-				dealInfo.State.SectorStartEpoch > head.Height() {
+				dealInfo.State.SectorStartEpoch > ts.Height() ||
+				dealInfo.State.SlashEpoch > -1 {
 				continue
 			}

-			netTotals.seenClient[dealInfo.Proposal.Client] = true
+			netTotals.clients[dealInfo.Proposal.Client] = struct{}{}
+
+			if _, seen := netTotals.providers[dealInfo.Proposal.Provider]; !seen {
+				pm := providerMeta{}
+
+				mi, err := api.StateMinerInfo(ctx, dealInfo.Proposal.Provider, ts.Key())
+				if err != nil {
+					return err
+				}
+
+				if mi.PeerId == nil || *mi.PeerId == "" {
+					log.Infof("private provider %s", dealInfo.Proposal.Provider)
+					pm.nonidentifiable = true
+					netTotals.UniquePrivateProviders++
+				}
+
+				netTotals.providers[dealInfo.Proposal.Provider] = pm
+				netTotals.UniqueProviders++
+			}
+
+			if _, seen := netTotals.pieces[dealInfo.Proposal.PieceCID]; !seen {
+				netTotals.pieces[dealInfo.Proposal.PieceCID] = struct{}{}
+				netTotals.UniqueBytes += int64(dealInfo.Proposal.PieceSize)
+				netTotals.UniqueCids++
+			}
+
 			netTotals.TotalBytes += int64(dealInfo.Proposal.PieceSize)
-			netTotals.seenProvider[dealInfo.Proposal.Provider] = true
-			netTotals.seenPieceCid[dealInfo.Proposal.PieceCID] = true
 			netTotals.TotalDeals++
+			if netTotals.providers[dealInfo.Proposal.Provider].nonidentifiable {
+				netTotals.PrivateTotalBytes += int64(dealInfo.Proposal.PieceSize)
+				netTotals.PrivateTotalDeals++
+			}

 			if dealInfo.Proposal.VerifiedDeal {
-				netTotals.FilplusTotalDeals++
-				netTotals.FilplusTotalBytes += int64(dealInfo.Proposal.PieceSize)
+				netTotals.FilPlus.TotalBytes += int64(dealInfo.Proposal.PieceSize)
+				netTotals.FilPlus.TotalDeals++
+				if netTotals.providers[dealInfo.Proposal.Provider].nonidentifiable {
+					netTotals.FilPlus.PrivateTotalBytes += int64(dealInfo.Proposal.PieceSize)
+					netTotals.FilPlus.PrivateTotalDeals++
+				}
 			}
 		}

-		netTotals.UniqueCids = len(netTotals.seenPieceCid)
-		netTotals.UniqueClients = len(netTotals.seenClient)
-		netTotals.UniqueProviders = len(netTotals.seenProvider)
+		netTotals.UniqueClients = len(netTotals.clients)

-		netTotals.CapacityCarryingData, _ = new(corebig.Rat).SetFrac(
+		ccd, _ := new(corebig.Rat).SetFrac(
 			corebig.NewInt(netTotals.TotalBytes),
 			netTotals.RawNetworkPower.Int,
 		).Float64()
+		netTotals.CapacityCarryingData = humanFloat(ccd)
+
+		ccdfp, _ := new(corebig.Rat).SetFrac(
+			corebig.NewInt(netTotals.FilPlus.TotalBytes),
+			netTotals.RawNetworkPower.Int,
+		).Float64()
+		netTotals.FilPlus.CapacityCarryingData = humanFloat(ccdfp)

 		return json.NewEncoder(os.Stdout).Encode(
 			networkTotalsOutput{
-				Epoch:    int64(head.Height()),
+				Epoch:    int64(ts.Height()),
 				Endpoint: "NETWORK_WIDE_TOTALS",
 				Payload:  netTotals,
 			},
@@ -97,6 +97,7 @@
 * [Return](#Return)
  * [ReturnAddPiece](#ReturnAddPiece)
  * [ReturnFetch](#ReturnFetch)
+  * [ReturnFinalizeReplicaUpdate](#ReturnFinalizeReplicaUpdate)
  * [ReturnFinalizeSector](#ReturnFinalizeSector)
  * [ReturnGenerateSectorKeyFromData](#ReturnGenerateSectorKeyFromData)
  * [ReturnMoveStorage](#ReturnMoveStorage)
@@ -116,6 +117,7 @@
  * [SealingAbort](#SealingAbort)
  * [SealingSchedDiag](#SealingSchedDiag)
 * [Sector](#Sector)
+  * [SectorAbortUpgrade](#SectorAbortUpgrade)
  * [SectorAddPieceToAny](#SectorAddPieceToAny)
  * [SectorCommitFlush](#SectorCommitFlush)
  * [SectorCommitPending](#SectorCommitPending)
@@ -2054,6 +2056,30 @@ Response: `{}`
 ### ReturnFetch


+Perms: admin
+
+Inputs:
+```json
+[
+  {
+    "Sector": {
+      "Miner": 1000,
+      "Number": 9
+    },
+    "ID": "07070707-0707-0707-0707-070707070707"
+  },
+  {
+    "Code": 0,
+    "Message": "string value"
+  }
+]
+```
+
+Response: `{}`
+
+### ReturnFinalizeReplicaUpdate
+
+
 Perms: admin

 Inputs:
@@ -2474,6 +2500,21 @@ Response: `{}`
 ## Sector


+### SectorAbortUpgrade
+SectorAbortUpgrade can be called on sectors that are in the process of being upgraded to abort it
+
+
+Perms: admin
+
+Inputs:
+```json
+[
+  9
+]
+```
+
+Response: `{}`
+
 ### SectorAddPieceToAny
 Add piece to an open sector. If no sectors with enough space are open,
 either a new sector will be created, or this call will block until more
@@ -10,6 +10,7 @@
 * [Add](#Add)
  * [AddPiece](#AddPiece)
 * [Finalize](#Finalize)
+  * [FinalizeReplicaUpdate](#FinalizeReplicaUpdate)
  * [FinalizeSector](#FinalizeSector)
 * [Generate](#Generate)
  * [GenerateSectorKeyFromData](#GenerateSectorKeyFromData)
@@ -1112,6 +1113,41 @@ Response:
 ## Finalize


+### FinalizeReplicaUpdate
+
+
+Perms: admin
+
+Inputs:
+```json
+[
+  {
+    "ID": {
+      "Miner": 1000,
+      "Number": 9
+    },
+    "ProofType": 8
+  },
+  [
+    {
+      "Offset": 1024,
+      "Size": 1024
+    }
+  ]
+]
+```
+
+Response:
+```json
+{
+  "Sector": {
+    "Miner": 1000,
+    "Number": 9
+  },
+  "ID": "07070707-0707-0707-0707-070707070707"
+}
+```
+
 ### FinalizeSector


@@ -7,7 +7,7 @@ USAGE:
   lotus-miner [global options] command [command options] [arguments...]

 VERSION:
-   1.15.0-dev
+   1.15.0-rc1

 COMMANDS:
   init     Initialize a lotus miner repo
@@ -1580,6 +1580,7 @@ COMMANDS:
   terminate             Terminate sector on-chain then remove (WARNING: This means losing power and collateral for the removed sector)
   remove                Forcefully remove a sector (WARNING: This means losing power and collateral for the removed sector (use 'terminate' for lower penalty))
   snap-up               Mark a committed capacity sector to be filled with deals
+   abort-upgrade         Abort the attempted (SnapDeals) upgrade of a CC sector, reverting it to as before
   mark-for-upgrade      Mark a committed capacity sector for replacement by a sector with deals
   seal                  Manually start sealing a sector (filling any unused space with junk)
   set-seal-delay        Set the time, in minutes, that a new sector waits for deals before sealing starts
@@ -1815,6 +1816,19 @@ OPTIONS:
   
 ```

+### lotus-miner sectors abort-upgrade
+```
+NAME:
+   lotus-miner sectors abort-upgrade - Abort the attempted (SnapDeals) upgrade of a CC sector, reverting it to as before
+
+USAGE:
+   lotus-miner sectors abort-upgrade [command options] <sectorNum>
+
+OPTIONS:
+   --help, -h  show help (default: false)
+   
+```
+
 ### lotus-miner sectors mark-for-upgrade
 ```
 NAME:
@@ -7,7 +7,7 @@ USAGE:
   lotus-worker [global options] command [command options] [arguments...]

 VERSION:
-   1.15.0-dev
+   1.15.0-rc1

 COMMANDS:
   run         Start lotus worker
@@ -7,7 +7,7 @@ USAGE:
   lotus [global options] command [command options] [arguments...]

 VERSION:
-   1.15.0-dev
+   1.15.0-rc1

 COMMANDS:
   daemon   Start a lotus daemon process
@@ -163,11 +163,11 @@
    #HotStoreType = "badger"

    # MarkSetType specifies the type of the markset.
-    # It can be "map" (default) for in memory marking or "badger" for on-disk marking.
+    # It can be "map" for in memory marking or "badger" (default) for on-disk marking.
    #
    # type: string
    # env var: LOTUS_CHAINSTORE_SPLITSTORE_MARKSETTYPE
-    #MarkSetType = "map"
+    #MarkSetType = "badger"

    # HotStoreMessageRetention specifies the retention policy for messages, in finalities beyond
    # the compaction boundary; default is 0.
@@ -167,6 +167,14 @@
  # env var: LOTUS_DEALMAKING_EXPECTEDSEALDURATION
  #ExpectedSealDuration = "24h0m0s"

+  # Whether new sectors are created to pack incoming deals
+  # When this is set to false no new sectors will be created for sealing incoming deals
+  # This is useful for forcing all deals to be assigned as snap deals to sectors marked for upgrade
+  #
+  # type: bool
+  # env var: LOTUS_DEALMAKING_MAKENEWSECTORFORDEALS
+  #MakeNewSectorForDeals = true
+
  # Maximum amount of time proposed deal StartEpoch can be in future
  #
  # type: Duration
@@ -55,6 +55,25 @@ func (m *Manager) CheckProvable(ctx context.Context, pp abi.RegisteredPoStProof,
 				return nil
 			}

+			// temporary hack to make the check work with snapdeals
+			// will go away in https://github.com/filecoin-project/lotus/pull/7971
+			if lp.Sealed == "" || lp.Cache == "" {
+				// maybe it's update
+				lockedUpdate, err := m.index.StorageTryLock(ctx, sector.ID, storiface.FTUpdate|storiface.FTUpdateCache, storiface.FTNone)
+				if err != nil {
+					return xerrors.Errorf("acquiring sector lock: %w", err)
+				}
+				if lockedUpdate {
+					lp, _, err = m.localStore.AcquireSector(ctx, sector, storiface.FTUpdate|storiface.FTUpdateCache, storiface.FTNone, storiface.PathStorage, storiface.AcquireMove)
+					if err != nil {
+						log.Warnw("CheckProvable Sector FAULT: acquire sector in checkProvable", "sector", sector, "error", err)
+						bad[sector.ID] = fmt.Sprintf("acquire sector failed: %s", err)
+						return nil
+					}
+					lp.Sealed, lp.Cache = lp.Update, lp.UpdateCache
+				}
+			}
+
 			if lp.Sealed == "" || lp.Cache == "" {
 				log.Warnw("CheckProvable Sector FAULT: cache and/or sealed paths not found", "sector", sector, "sealed", lp.Sealed, "cache", lp.Cache)
 				bad[sector.ID] = fmt.Sprintf("cache and/or sealed paths not found, cache %q, sealed %q", lp.Cache, lp.Sealed)
@@ -769,7 +769,7 @@ func (sb *Sealer) ReleaseSealed(ctx context.Context, sector storage.SectorRef) e
 	return xerrors.Errorf("not supported at this layer")
 }

-func (sb *Sealer) FinalizeSector(ctx context.Context, sector storage.SectorRef, keepUnsealed []storage.Range) error {
+func (sb *Sealer) freeUnsealed(ctx context.Context, sector storage.SectorRef, keepUnsealed []storage.Range) error {
 	ssize, err := sector.ProofType.SectorSize()
 	if err != nil {
 		return err
@@ -834,6 +834,19 @@ func (sb *Sealer) FinalizeSector(ctx context.Context, sector storage.SectorRef,

 	}

+	return nil
+}
+
+func (sb *Sealer) FinalizeSector(ctx context.Context, sector storage.SectorRef, keepUnsealed []storage.Range) error {
+	ssize, err := sector.ProofType.SectorSize()
+	if err != nil {
+		return err
+	}
+
+	if err := sb.freeUnsealed(ctx, sector, keepUnsealed); err != nil {
+		return err
+	}
+
 	paths, done, err := sb.sectors.AcquireSector(ctx, sector, storiface.FTCache, 0, storiface.PathStorage)
 	if err != nil {
 		return xerrors.Errorf("acquiring sector cache path: %w", err)
@@ -843,6 +856,43 @@ func (sb *Sealer) FinalizeSector(ctx context.Context, sector storage.SectorRef,
 	return ffi.ClearCache(uint64(ssize), paths.Cache)
 }

+func (sb *Sealer) FinalizeReplicaUpdate(ctx context.Context, sector storage.SectorRef, keepUnsealed []storage.Range) error {
+	ssize, err := sector.ProofType.SectorSize()
+	if err != nil {
+		return err
+	}
+
+	if err := sb.freeUnsealed(ctx, sector, keepUnsealed); err != nil {
+		return err
+	}
+
+	{
+		paths, done, err := sb.sectors.AcquireSector(ctx, sector, storiface.FTCache, 0, storiface.PathStorage)
+		if err != nil {
+			return xerrors.Errorf("acquiring sector cache path: %w", err)
+		}
+		defer done()
+
+		if err := ffi.ClearCache(uint64(ssize), paths.Cache); err != nil {
+			return xerrors.Errorf("clear cache: %w", err)
+		}
+	}
+
+	{
+		paths, done, err := sb.sectors.AcquireSector(ctx, sector, storiface.FTUpdateCache, 0, storiface.PathStorage)
+		if err != nil {
+			return xerrors.Errorf("acquiring sector cache path: %w", err)
+		}
+		defer done()
+
+		if err := ffi.ClearCache(uint64(ssize), paths.UpdateCache); err != nil {
+			return xerrors.Errorf("clear cache: %w", err)
+		}
+	}
+
+	return nil
+}
+
 func (sb *Sealer) ReleaseUnsealed(ctx context.Context, sector storage.SectorRef, safeToFree []storage.Range) error {
 	// This call is meant to mark storage as 'freeable'. Given that unsealing is
 	// very expensive, we don't remove data as soon as we can - instead we only
@@ -146,7 +146,7 @@ func New(ctx context.Context, lstor *stores.Local, stor *stores.Remote, ls store
 	go m.sched.runSched()

 	localTasks := []sealtasks.TaskType{
-		sealtasks.TTCommit1, sealtasks.TTProveReplicaUpdate1, sealtasks.TTFinalize, sealtasks.TTFetch,
+		sealtasks.TTCommit1, sealtasks.TTProveReplicaUpdate1, sealtasks.TTFinalize, sealtasks.TTFetch, sealtasks.TTFinalizeReplicaUpdate,
 	}
 	if sc.AllowAddPiece {
 		localTasks = append(localTasks, sealtasks.TTAddPiece)
@@ -577,6 +577,74 @@ func (m *Manager) FinalizeSector(ctx context.Context, sector storage.SectorRef,
 	return nil
 }

+func (m *Manager) FinalizeReplicaUpdate(ctx context.Context, sector storage.SectorRef, keepUnsealed []storage.Range) error {
+	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
+
+	if err := m.index.StorageLock(ctx, sector.ID, storiface.FTNone, storiface.FTSealed|storiface.FTUnsealed|storiface.FTCache|storiface.FTUpdate|storiface.FTUpdateCache); err != nil {
+		return xerrors.Errorf("acquiring sector lock: %w", err)
+	}
+
+	fts := storiface.FTUnsealed
+	{
+		unsealedStores, err := m.index.StorageFindSector(ctx, sector.ID, storiface.FTUnsealed, 0, false)
+		if err != nil {
+			return xerrors.Errorf("finding unsealed sector: %w", err)
+		}
+
+		if len(unsealedStores) == 0 { // Is some edge-cases unsealed sector may not exist already, that's fine
+			fts = storiface.FTNone
+		}
+	}
+
+	pathType := storiface.PathStorage
+	{
+		sealedStores, err := m.index.StorageFindSector(ctx, sector.ID, storiface.FTUpdate, 0, false)
+		if err != nil {
+			return xerrors.Errorf("finding sealed sector: %w", err)
+		}
+
+		for _, store := range sealedStores {
+			if store.CanSeal {
+				pathType = storiface.PathSealing
+				break
+			}
+		}
+	}
+
+	selector := newExistingSelector(m.index, sector.ID, storiface.FTCache|storiface.FTSealed|storiface.FTUpdate|storiface.FTUpdateCache, false)
+
+	err := m.sched.Schedule(ctx, sector, sealtasks.TTFinalizeReplicaUpdate, selector,
+		m.schedFetch(sector, storiface.FTCache|storiface.FTSealed|storiface.FTUpdate|storiface.FTUpdateCache|fts, pathType, storiface.AcquireMove),
+		func(ctx context.Context, w Worker) error {
+			_, err := m.waitSimpleCall(ctx)(w.FinalizeReplicaUpdate(ctx, sector, keepUnsealed))
+			return err
+		})
+	if err != nil {
+		return err
+	}
+
+	fetchSel := newAllocSelector(m.index, storiface.FTCache|storiface.FTSealed|storiface.FTUpdate|storiface.FTUpdateCache, storiface.PathStorage)
+	moveUnsealed := fts
+	{
+		if len(keepUnsealed) == 0 {
+			moveUnsealed = storiface.FTNone
+		}
+	}
+
+	err = m.sched.Schedule(ctx, sector, sealtasks.TTFetch, fetchSel,
+		m.schedFetch(sector, storiface.FTCache|storiface.FTSealed|storiface.FTUpdate|storiface.FTUpdateCache|moveUnsealed, storiface.PathStorage, storiface.AcquireMove),
+		func(ctx context.Context, w Worker) error {
+			_, err := m.waitSimpleCall(ctx)(w.MoveStorage(ctx, sector, storiface.FTCache|storiface.FTSealed|storiface.FTUpdate|storiface.FTUpdateCache|moveUnsealed))
+			return err
+		})
+	if err != nil {
+		return xerrors.Errorf("moving sector to storage: %w", err)
+	}
+
+	return nil
+}
+
 func (m *Manager) ReleaseUnsealed(ctx context.Context, sector storage.SectorRef, safeToFree []storage.Range) error {
 	return nil
 }
@@ -875,6 +943,10 @@ func (m *Manager) ReturnProveReplicaUpdate2(ctx context.Context, callID storifac
 	return m.returnResult(ctx, callID, proof, err)
 }

+func (m *Manager) ReturnFinalizeReplicaUpdate(ctx context.Context, callID storiface.CallID, err *storiface.CallError) error {
+	return m.returnResult(ctx, callID, nil, err)
+}
+
 func (m *Manager) ReturnGenerateSectorKeyFromData(ctx context.Context, callID storiface.CallID, err *storiface.CallError) error {
 	return m.returnResult(ctx, callID, nil, err)
 }
@@ -477,6 +477,10 @@ func (mgr *SectorMgr) FinalizeSector(context.Context, storage.SectorRef, []stora
 	return nil
 }

+func (mgr *SectorMgr) FinalizeReplicaUpdate(context.Context, storage.SectorRef, []storage.Range) error {
+	return nil
+}
+
 func (mgr *SectorMgr) ReleaseUnsealed(ctx context.Context, sector storage.SectorRef, safeToFree []storage.Range) error {
 	return nil
 }
@@ -577,6 +581,10 @@ func (mgr *SectorMgr) ReturnGenerateSectorKeyFromData(ctx context.Context, callI
 	panic("not supported")
 }

+func (mgr *SectorMgr) ReturnFinalizeReplicaUpdate(ctx context.Context, callID storiface.CallID, err *storiface.CallError) error {
+	panic("not supported")
+}
+
 func (m mockVerifProver) VerifySeal(svi proof.SealVerifyInfo) (bool, error) {
 	plen, err := svi.SealProof.ProofSize()
 	if err != nil {
@@ -119,6 +119,10 @@ func (s *schedTestWorker) GenerateSectorKeyFromData(ctx context.Context, sector
 	panic("implement me")
 }

+func (s *schedTestWorker) FinalizeReplicaUpdate(ctx context.Context, sector storage.SectorRef, keepUnsealed []storage.Range) (storiface.CallID, error) {
+	panic("implement me")
+}
+
 func (s *schedTestWorker) MoveStorage(ctx context.Context, sector storage.SectorRef, types storiface.SectorFileType) (storiface.CallID, error) {
 	panic("implement me")
 }
@@ -14,10 +14,11 @@ const (
 	TTFetch  TaskType = "seal/v0/fetch"
 	TTUnseal TaskType = "seal/v0/unseal"

-	TTReplicaUpdate       TaskType = "seal/v0/replicaupdate"
-	TTProveReplicaUpdate1 TaskType = "seal/v0/provereplicaupdate/1"
-	TTProveReplicaUpdate2 TaskType = "seal/v0/provereplicaupdate/2"
-	TTRegenSectorKey      TaskType = "seal/v0/regensectorkey"
+	TTReplicaUpdate         TaskType = "seal/v0/replicaupdate"
+	TTProveReplicaUpdate1   TaskType = "seal/v0/provereplicaupdate/1"
+	TTProveReplicaUpdate2   TaskType = "seal/v0/provereplicaupdate/2"
+	TTRegenSectorKey        TaskType = "seal/v0/regensectorkey"
+	TTFinalizeReplicaUpdate TaskType = "seal/v0/finalize/replicaupdate"
 )

 var order = map[TaskType]int{
@@ -48,10 +49,11 @@ var shortNames = map[TaskType]string{
 	TTFetch:  "GET",
 	TTUnseal: "UNS",

-	TTReplicaUpdate:       "RU",
-	TTProveReplicaUpdate1: "PR1",
-	TTProveReplicaUpdate2: "PR2",
-	TTRegenSectorKey:      "GSK",
+	TTReplicaUpdate:         "RU",
+	TTProveReplicaUpdate1:   "PR1",
+	TTProveReplicaUpdate2:   "PR2",
+	TTRegenSectorKey:        "GSK",
+	TTFinalizeReplicaUpdate: "FRU",
 }

 func (a TaskType) MuchLess(b TaskType) (bool, bool) {
@@ -120,6 +120,7 @@ type WorkerCalls interface {
 	SealCommit1(ctx context.Context, sector storage.SectorRef, ticket abi.SealRandomness, seed abi.InteractiveSealRandomness, pieces []abi.PieceInfo, cids storage.SectorCids) (CallID, error)
 	SealCommit2(ctx context.Context, sector storage.SectorRef, c1o storage.Commit1Out) (CallID, error)
 	FinalizeSector(ctx context.Context, sector storage.SectorRef, keepUnsealed []storage.Range) (CallID, error)
+	FinalizeReplicaUpdate(ctx context.Context, sector storage.SectorRef, keepUnsealed []storage.Range) (CallID, error)
 	ReleaseUnsealed(ctx context.Context, sector storage.SectorRef, safeToFree []storage.Range) (CallID, error)
 	ReplicaUpdate(ctx context.Context, sector storage.SectorRef, pieces []abi.PieceInfo) (CallID, error)
 	ProveReplicaUpdate1(ctx context.Context, sector storage.SectorRef, sectorKey, newSealed, newUnsealed cid.Cid) (CallID, error)
@@ -182,6 +183,7 @@ type WorkerReturn interface {
 	ReturnProveReplicaUpdate1(ctx context.Context, callID CallID, proofs storage.ReplicaVanillaProofs, err *CallError) error
 	ReturnProveReplicaUpdate2(ctx context.Context, callID CallID, proof storage.ReplicaUpdateProof, err *CallError) error
 	ReturnGenerateSectorKeyFromData(ctx context.Context, callID CallID, err *CallError) error
+	ReturnFinalizeReplicaUpdate(ctx context.Context, callID CallID, err *CallError) error
 	ReturnMoveStorage(ctx context.Context, callID CallID, err *CallError) error
 	ReturnUnsealPiece(ctx context.Context, callID CallID, err *CallError) error
 	ReturnReadPiece(ctx context.Context, callID CallID, ok bool, err *CallError) error
@@ -87,6 +87,10 @@ func (t *testExec) GenerateSectorKeyFromData(ctx context.Context, sector storage
 	panic("implement me")
 }

+func (t *testExec) FinalizeReplicaUpdate(ctx context.Context, sector storage.SectorRef, keepUnsealed []storage.Range) error {
+	panic("implement me")
+}
+
 func (t *testExec) NewSector(ctx context.Context, sector storage.SectorRef) error {
 	panic("implement me")
 }
@@ -162,20 +162,21 @@ func (l *LocalWorker) ffiExec() (ffiwrapper.Storage, error) {
 type ReturnType string

 const (
-	AddPiece            ReturnType = "AddPiece"
-	SealPreCommit1      ReturnType = "SealPreCommit1"
-	SealPreCommit2      ReturnType = "SealPreCommit2"
-	SealCommit1         ReturnType = "SealCommit1"
-	SealCommit2         ReturnType = "SealCommit2"
-	FinalizeSector      ReturnType = "FinalizeSector"
-	ReplicaUpdate       ReturnType = "ReplicaUpdate"
-	ProveReplicaUpdate1 ReturnType = "ProveReplicaUpdate1"
-	ProveReplicaUpdate2 ReturnType = "ProveReplicaUpdate2"
-	GenerateSectorKey   ReturnType = "GenerateSectorKey"
-	ReleaseUnsealed     ReturnType = "ReleaseUnsealed"
-	MoveStorage         ReturnType = "MoveStorage"
-	UnsealPiece         ReturnType = "UnsealPiece"
-	Fetch               ReturnType = "Fetch"
+	AddPiece              ReturnType = "AddPiece"
+	SealPreCommit1        ReturnType = "SealPreCommit1"
+	SealPreCommit2        ReturnType = "SealPreCommit2"
+	SealCommit1           ReturnType = "SealCommit1"
+	SealCommit2           ReturnType = "SealCommit2"
+	FinalizeSector        ReturnType = "FinalizeSector"
+	FinalizeReplicaUpdate ReturnType = "FinalizeReplicaUpdate"
+	ReplicaUpdate         ReturnType = "ReplicaUpdate"
+	ProveReplicaUpdate1   ReturnType = "ProveReplicaUpdate1"
+	ProveReplicaUpdate2   ReturnType = "ProveReplicaUpdate2"
+	GenerateSectorKey     ReturnType = "GenerateSectorKey"
+	ReleaseUnsealed       ReturnType = "ReleaseUnsealed"
+	MoveStorage           ReturnType = "MoveStorage"
+	UnsealPiece           ReturnType = "UnsealPiece"
+	Fetch                 ReturnType = "Fetch"
 )

 // in: func(WorkerReturn, context.Context, CallID, err string)
@@ -213,20 +214,21 @@ func rfunc(in interface{}) func(context.Context, storiface.CallID, storiface.Wor
 }

 var returnFunc = map[ReturnType]func(context.Context, storiface.CallID, storiface.WorkerReturn, interface{}, *storiface.CallError) error{
-	AddPiece:            rfunc(storiface.WorkerReturn.ReturnAddPiece),
-	SealPreCommit1:      rfunc(storiface.WorkerReturn.ReturnSealPreCommit1),
-	SealPreCommit2:      rfunc(storiface.WorkerReturn.ReturnSealPreCommit2),
-	SealCommit1:         rfunc(storiface.WorkerReturn.ReturnSealCommit1),
-	SealCommit2:         rfunc(storiface.WorkerReturn.ReturnSealCommit2),
-	FinalizeSector:      rfunc(storiface.WorkerReturn.ReturnFinalizeSector),
-	ReleaseUnsealed:     rfunc(storiface.WorkerReturn.ReturnReleaseUnsealed),
-	ReplicaUpdate:       rfunc(storiface.WorkerReturn.ReturnReplicaUpdate),
-	ProveReplicaUpdate1: rfunc(storiface.WorkerReturn.ReturnProveReplicaUpdate1),
-	ProveReplicaUpdate2: rfunc(storiface.WorkerReturn.ReturnProveReplicaUpdate2),
-	GenerateSectorKey:   rfunc(storiface.WorkerReturn.ReturnGenerateSectorKeyFromData),
-	MoveStorage:         rfunc(storiface.WorkerReturn.ReturnMoveStorage),
-	UnsealPiece:         rfunc(storiface.WorkerReturn.ReturnUnsealPiece),
-	Fetch:               rfunc(storiface.WorkerReturn.ReturnFetch),
+	AddPiece:              rfunc(storiface.WorkerReturn.ReturnAddPiece),
+	SealPreCommit1:        rfunc(storiface.WorkerReturn.ReturnSealPreCommit1),
+	SealPreCommit2:        rfunc(storiface.WorkerReturn.ReturnSealPreCommit2),
+	SealCommit1:           rfunc(storiface.WorkerReturn.ReturnSealCommit1),
+	SealCommit2:           rfunc(storiface.WorkerReturn.ReturnSealCommit2),
+	FinalizeSector:        rfunc(storiface.WorkerReturn.ReturnFinalizeSector),
+	ReleaseUnsealed:       rfunc(storiface.WorkerReturn.ReturnReleaseUnsealed),
+	ReplicaUpdate:         rfunc(storiface.WorkerReturn.ReturnReplicaUpdate),
+	ProveReplicaUpdate1:   rfunc(storiface.WorkerReturn.ReturnProveReplicaUpdate1),
+	ProveReplicaUpdate2:   rfunc(storiface.WorkerReturn.ReturnProveReplicaUpdate2),
+	GenerateSectorKey:     rfunc(storiface.WorkerReturn.ReturnGenerateSectorKeyFromData),
+	FinalizeReplicaUpdate: rfunc(storiface.WorkerReturn.ReturnFinalizeReplicaUpdate),
+	MoveStorage:           rfunc(storiface.WorkerReturn.ReturnMoveStorage),
+	UnsealPiece:           rfunc(storiface.WorkerReturn.ReturnUnsealPiece),
+	Fetch:                 rfunc(storiface.WorkerReturn.ReturnFetch),
 }

 func (l *LocalWorker) asyncCall(ctx context.Context, sector storage.SectorRef, rt ReturnType, work func(ctx context.Context, ci storiface.CallID) (interface{}, error)) (storiface.CallID, error) {
@@ -456,6 +458,27 @@ func (l *LocalWorker) FinalizeSector(ctx context.Context, sector storage.SectorR
 	})
 }

+func (l *LocalWorker) FinalizeReplicaUpdate(ctx context.Context, sector storage.SectorRef, keepUnsealed []storage.Range) (storiface.CallID, error) {
+	sb, err := l.executor()
+	if err != nil {
+		return storiface.UndefCall, err
+	}
+
+	return l.asyncCall(ctx, sector, FinalizeReplicaUpdate, func(ctx context.Context, ci storiface.CallID) (interface{}, error) {
+		if err := sb.FinalizeReplicaUpdate(ctx, sector, keepUnsealed); err != nil {
+			return nil, xerrors.Errorf("finalizing sector: %w", err)
+		}
+
+		if len(keepUnsealed) == 0 {
+			if err := l.storage.Remove(ctx, sector.ID, storiface.FTUnsealed, true, nil); err != nil {
+				return nil, xerrors.Errorf("removing unsealed data: %w", err)
+			}
+		}
+
+		return nil, err
+	})
+}
+
 func (l *LocalWorker) ReleaseUnsealed(ctx context.Context, sector storage.SectorRef, safeToFree []storage.Range) (storiface.CallID, error) {
 	return storiface.UndefCall, xerrors.Errorf("implement me")
 }
@@ -215,4 +215,8 @@ func (t *trackedWorker) ProveReplicaUpdate2(ctx context.Context, sector storage.
 	})
 }

+func (t *trackedWorker) FinalizeReplicaUpdate(ctx context.Context, sector storage.SectorRef, keepUnsealed []storage.Range) (storiface.CallID, error) {
+	return t.tracker.track(ctx, t.execute, t.wid, t.workerInfo, sector, sealtasks.TTFinalizeReplicaUpdate, func() (storiface.CallID, error) { return t.Worker.FinalizeReplicaUpdate(ctx, sector, keepUnsealed) })
+}
+
 var _ Worker = &trackedWorker{}
@@ -20,6 +20,7 @@ import (
 //  We should implement some wait-for-api logic
 type ErrApi struct{ error }

+type ErrNoDeals struct{ error }
 type ErrInvalidDeals struct{ error }
 type ErrInvalidPiece struct{ error }
 type ErrExpiredDeals struct{ error }
@@ -38,12 +39,14 @@ type ErrCommitWaitFailed struct{ error }
 type ErrBadRU struct{ error }
 type ErrBadPR struct{ error }

-func checkPieces(ctx context.Context, maddr address.Address, si SectorInfo, api SealingAPI) error {
+func checkPieces(ctx context.Context, maddr address.Address, si SectorInfo, api SealingAPI, mustHaveDeals bool) error {
 	tok, height, err := api.ChainHead(ctx)
 	if err != nil {
 		return &ErrApi{xerrors.Errorf("getting chain head: %w", err)}
 	}

+	dealCount := 0
+
 	for i, p := range si.Pieces {
 		// if no deal is associated with the piece, ensure that we added it as
 		// filler (i.e. ensure that it has a zero PieceCID)
@@ -55,6 +58,8 @@ func checkPieces(ctx context.Context, maddr address.Address, si SectorInfo, api
 			continue
 		}

+		dealCount++
+
 		proposal, err := api.StateMarketStorageDealProposal(ctx, p.DealInfo.DealID, tok)
 		if err != nil {
 			return &ErrInvalidDeals{xerrors.Errorf("getting deal %d for piece %d: %w", p.DealInfo.DealID, i, err)}
@@ -77,13 +82,17 @@ func checkPieces(ctx context.Context, maddr address.Address, si SectorInfo, api
 		}
 	}

+	if mustHaveDeals && dealCount <= 0 {
+		return &ErrNoDeals{(xerrors.Errorf("sector %d must have deals, but does not", si.SectorNumber))}
+	}
+
 	return nil
 }

 // checkPrecommit checks that data commitment generated in the sealing process
 //  matches pieces, and that the seal ticket isn't expired
 func checkPrecommit(ctx context.Context, maddr address.Address, si SectorInfo, tok TipSetToken, height abi.ChainEpoch, api SealingAPI) (err error) {
-	if err := checkPieces(ctx, maddr, si, api); err != nil {
+	if err := checkPieces(ctx, maddr, si, api, false); err != nil {
 		return err
 	}

@@ -184,7 +193,7 @@ func (m *Sealing) checkCommit(ctx context.Context, si SectorInfo, proof []byte,
 		return &ErrInvalidProof{xerrors.New("invalid proof (compute error?)")}
 	}

-	if err := checkPieces(ctx, m.maddr, si, m.Api); err != nil {
+	if err := checkPieces(ctx, m.maddr, si, m.Api, false); err != nil {
 		return err
 	}

@@ -194,7 +203,7 @@ func (m *Sealing) checkCommit(ctx context.Context, si SectorInfo, proof []byte,
 // check that sector info is good after running a replica update
 func checkReplicaUpdate(ctx context.Context, maddr address.Address, si SectorInfo, tok TipSetToken, api SealingAPI) error {

-	if err := checkPieces(ctx, maddr, si, api); err != nil {
+	if err := checkPieces(ctx, maddr, si, api, true); err != nil {
 		return err
 	}
 	if !si.CCUpdate {
@@ -137,27 +137,32 @@ var fsmPlanners = map[SectorState]func(events []statemachine.Event, state *Secto
 	SnapDealsWaitDeals: planOne(
 		on(SectorAddPiece{}, SnapDealsAddPiece),
 		on(SectorStartPacking{}, SnapDealsPacking),
+		on(SectorAbortUpgrade{}, AbortUpgrade),
 	),
 	SnapDealsAddPiece: planOne(
 		on(SectorPieceAdded{}, SnapDealsWaitDeals),
 		apply(SectorStartPacking{}),
 		apply(SectorAddPiece{}),
 		on(SectorAddPieceFailed{}, SnapDealsAddPieceFailed),
+		on(SectorAbortUpgrade{}, AbortUpgrade),
 	),
 	SnapDealsPacking: planOne(
 		on(SectorPacked{}, UpdateReplica),
+		on(SectorAbortUpgrade{}, AbortUpgrade),
 	),
 	UpdateReplica: planOne(
 		on(SectorReplicaUpdate{}, ProveReplicaUpdate),
 		on(SectorUpdateReplicaFailed{}, ReplicaUpdateFailed),
 		on(SectorDealsExpired{}, SnapDealsDealsExpired),
 		on(SectorInvalidDealIDs{}, SnapDealsRecoverDealIDs),
+		on(SectorAbortUpgrade{}, AbortUpgrade),
 	),
 	ProveReplicaUpdate: planOne(
 		on(SectorProveReplicaUpdate{}, SubmitReplicaUpdate),
 		on(SectorProveReplicaUpdateFailed{}, ReplicaUpdateFailed),
 		on(SectorDealsExpired{}, SnapDealsDealsExpired),
 		on(SectorInvalidDealIDs{}, SnapDealsRecoverDealIDs),
+		on(SectorAbortUpgrade{}, AbortUpgrade),
 	),
 	SubmitReplicaUpdate: planOne(
 		on(SectorReplicaUpdateSubmitted{}, ReplicaUpdateWait),
@@ -169,7 +174,14 @@ var fsmPlanners = map[SectorState]func(events []statemachine.Event, state *Secto
 		on(SectorAbortUpgrade{}, AbortUpgrade),
 	),
 	FinalizeReplicaUpdate: planOne(
-		on(SectorFinalized{}, Proving),
+		on(SectorFinalized{}, UpdateActivating),
+	),
+	UpdateActivating: planOne(
+		on(SectorUpdateActive{}, ReleaseSectorKey),
+	),
+	ReleaseSectorKey: planOne(
+		on(SectorKeyReleased{}, Proving),
+		on(SectorReleaseKeyFailed{}, ReleaseSectorKeyFailed),
 	),
 	// Sealing errors

@@ -231,6 +243,7 @@ var fsmPlanners = map[SectorState]func(events []statemachine.Event, state *Secto
 		on(SectorRetryWaitDeals{}, SnapDealsWaitDeals),
 		apply(SectorStartPacking{}),
 		apply(SectorAddPiece{}),
+		on(SectorAbortUpgrade{}, AbortUpgrade),
 	),
 	SnapDealsDealsExpired: planOne(
 		on(SectorAbortUpgrade{}, AbortUpgrade),
@@ -249,6 +262,10 @@ var fsmPlanners = map[SectorState]func(events []statemachine.Event, state *Secto
 		on(SectorRetryProveReplicaUpdate{}, ProveReplicaUpdate),
 		on(SectorInvalidDealIDs{}, SnapDealsRecoverDealIDs),
 		on(SectorDealsExpired{}, SnapDealsDealsExpired),
+		on(SectorAbortUpgrade{}, AbortUpgrade),
+	),
+	ReleaseSectorKeyFailed: planOne(
+		on(SectorUpdateActive{}, ReleaseSectorKey),
 	),

 	// Post-seal
@@ -477,6 +494,10 @@ func (m *Sealing) plan(events []statemachine.Event, state *SectorInfo) (func(sta
 		return m.handleReplicaUpdateWait, processed, nil
 	case FinalizeReplicaUpdate:
 		return m.handleFinalizeReplicaUpdate, processed, nil
+	case UpdateActivating:
+		return m.handleUpdateActivating, processed, nil
+	case ReleaseSectorKey:
+		return m.handleReleaseSectorKey, processed, nil

 	// Handled failure modes
 	case AddPieceFailed:
@@ -513,6 +534,8 @@ func (m *Sealing) plan(events []statemachine.Event, state *SectorInfo) (func(sta
 		return m.handleSnapDealsRecoverDealIDs, processed, nil
 	case ReplicaUpdateFailed:
 		return m.handleSubmitReplicaUpdateFailed, processed, nil
+	case ReleaseSectorKeyFailed:
+		return m.handleReleaseSectorKeyFailed, 0, err
 	case AbortUpgrade:
 		return m.handleAbortUpgrade, processed, nil

@@ -335,6 +335,14 @@ type SectorReplicaUpdateLanded struct{}

 func (evt SectorReplicaUpdateLanded) apply(state *SectorInfo) {}

+type SectorUpdateActive struct{}
+
+func (evt SectorUpdateActive) apply(state *SectorInfo) {}
+
+type SectorKeyReleased struct{}
+
+func (evt SectorKeyReleased) apply(state *SectorInfo) {}
+
 // Failed state recovery

 type SectorRetrySealPreCommit1 struct{}
@@ -445,6 +453,13 @@ type SectorSubmitReplicaUpdateFailed struct{}

 func (evt SectorSubmitReplicaUpdateFailed) apply(state *SectorInfo) {}

+type SectorReleaseKeyFailed struct{ error }
+
+func (evt SectorReleaseKeyFailed) FormatError(xerrors.Printer) (next error) {
+	return evt.error
+}
+func (evt SectorReleaseKeyFailed) apply(state *SectorInfo) {}
+
 // Faults

 type SectorFaulty struct{}
@@ -16,6 +16,7 @@ import (
 	"github.com/filecoin-project/specs-storage/storage"

 	"github.com/filecoin-project/lotus/api"
+	"github.com/filecoin-project/lotus/build"
 	sectorstorage "github.com/filecoin-project/lotus/extern/sector-storage"
 	"github.com/filecoin-project/lotus/extern/sector-storage/ffiwrapper"
 	"github.com/filecoin-project/lotus/extern/storage-sealing/sealiface"
@@ -117,9 +118,25 @@ func (m *Sealing) maybeStartSealing(ctx statemachine.Context, sector SectorInfo,
 			return false, xerrors.Errorf("getting storage config: %w", err)
 		}

-		// todo check deal age, start sealing if any deal has less than X (configurable) to start deadline
 		sealTime := time.Unix(sector.CreationTime, 0).Add(cfg.WaitDealsDelay)

+		// check deal age, start sealing when the deal closest to starting is within slack time
+		_, current, err := m.Api.ChainHead(ctx.Context())
+		blockTime := time.Second * time.Duration(build.BlockDelaySecs)
+		if err != nil {
+			return false, xerrors.Errorf("API error getting head: %w", err)
+		}
+		for _, piece := range sector.Pieces {
+			if piece.DealInfo == nil {
+				continue
+			}
+			dealSafeSealEpoch := piece.DealInfo.DealProposal.StartEpoch - cfg.StartEpochSealingBuffer
+			dealSafeSealTime := time.Now().Add(time.Duration(dealSafeSealEpoch-current) * blockTime)
+			if dealSafeSealTime.Before(sealTime) {
+				sealTime = dealSafeSealTime
+			}
+		}
+
 		if now.After(sealTime) {
 			log.Infow("starting to seal deal sector", "sector", sector.SectorNumber, "trigger", "wait-timeout")
 			return true, ctx.Send(SectorStartPacking{})
@@ -475,6 +492,10 @@ func (m *Sealing) tryCreateDealSector(ctx context.Context, sp abi.RegisteredSeal
 		return xerrors.Errorf("getting storage config: %w", err)
 	}

+	if !cfg.MakeNewSectorForDeals {
+		return nil
+	}
+
 	if cfg.MaxSealingSectorsForDeals > 0 && m.stats.curSealing() >= cfg.MaxSealingSectorsForDeals {
 		return nil
 	}
@@ -524,6 +545,13 @@ func (m *Sealing) StartPacking(sid abi.SectorNumber) error {
 	return m.sectors.Send(uint64(sid), SectorStartPacking{})
 }

+func (m *Sealing) AbortUpgrade(sid abi.SectorNumber) error {
+	m.startupWait.Wait()
+
+	log.Infow("aborting upgrade of sector", "sector", sid, "trigger", "user")
+	return m.sectors.Send(uint64(sid), SectorAbortUpgrade{xerrors.New("triggered by user")})
+}
+
 func proposalCID(deal api.PieceDealInfo) cid.Cid {
 	pc, err := deal.DealProposal.Cid()
 	if err != nil {
@@ -18,6 +18,8 @@ type Config struct {
 	// includes failed, 0 = no limit
 	MaxSealingSectorsForDeals uint64

+	MakeNewSectorForDeals bool
+
 	WaitDealsDelay time.Duration

 	CommittedCapacitySectorLifetime time.Duration
@@ -52,11 +52,14 @@ var ExistSectorStateList = map[SectorState]struct{}{
 	ProveReplicaUpdate:      {},
 	SubmitReplicaUpdate:     {},
 	ReplicaUpdateWait:       {},
+	UpdateActivating:        {},
+	ReleaseSectorKey:        {},
 	FinalizeReplicaUpdate:   {},
 	SnapDealsAddPieceFailed: {},
 	SnapDealsDealsExpired:   {},
 	SnapDealsRecoverDealIDs: {},
 	ReplicaUpdateFailed:     {},
+	ReleaseSectorKeyFailed:  {},
 	AbortUpgrade:            {},
 }

@@ -104,6 +107,8 @@ const (
 	SubmitReplicaUpdate   SectorState = "SubmitReplicaUpdate"
 	ReplicaUpdateWait     SectorState = "ReplicaUpdateWait"
 	FinalizeReplicaUpdate SectorState = "FinalizeReplicaUpdate"
+	UpdateActivating      SectorState = "UpdateActivating"
+	ReleaseSectorKey      SectorState = "ReleaseSectorKey"

 	// error modes
 	FailedUnrecoverable  SectorState = "FailedUnrecoverable"
@@ -124,6 +129,7 @@ const (
 	SnapDealsRecoverDealIDs SectorState = "SnapDealsRecoverDealIDs"
 	AbortUpgrade            SectorState = "AbortUpgrade"
 	ReplicaUpdateFailed     SectorState = "ReplicaUpdateFailed"
+	ReleaseSectorKeyFailed  SectorState = "ReleaseSectorKeyFailed"

 	Faulty        SectorState = "Faulty"        // sector is corrupted or gone for some reason
 	FaultReported SectorState = "FaultReported" // sector has been declared as a fault on chain
@@ -153,7 +159,7 @@ func toStatState(st SectorState, finEarly bool) statSectorState {
 			return sstProving
 		}
 		return sstSealing
-	case Proving, Removed, Removing, Terminating, TerminateWait, TerminateFinality, TerminateFailed:
+	case Proving, UpdateActivating, ReleaseSectorKey, Removed, Removing, Terminating, TerminateWait, TerminateFinality, TerminateFailed:
 		return sstProving
 	}

@@ -211,7 +211,7 @@ func (m *Sealing) handleSubmitReplicaUpdateFailed(ctx statemachine.Context, sect

 	tok, _, err := m.Api.ChainHead(ctx.Context())
 	if err != nil {
-		log.Errorf("handleCommitting: api error, not proceeding: %+v", err)
+		log.Errorf("handleSubmitReplicaUpdateFailed: api error, not proceeding: %+v", err)
 		return nil
 	}

@@ -237,6 +237,17 @@ func (m *Sealing) handleSubmitReplicaUpdateFailed(ctx statemachine.Context, sect
 		}
 	}

+	// Abort upgrade for sectors that went faulty since being marked for upgrade
+	active, err := sectorActive(ctx.Context(), m.Api, m.maddr, tok, sector.SectorNumber)
+	if err != nil {
+		log.Errorf("sector active check: api error, not proceeding: %+v", err)
+		return nil
+	}
+	if !active {
+		log.Errorf("sector marked for upgrade %d no longer active, aborting upgrade", sector.SectorNumber)
+		return ctx.Send(SectorAbortUpgrade{})
+	}
+
 	if err := failedCooldown(ctx, sector); err != nil {
 		return err
 	}
@@ -244,6 +255,16 @@ func (m *Sealing) handleSubmitReplicaUpdateFailed(ctx statemachine.Context, sect
 	return ctx.Send(SectorRetrySubmitReplicaUpdate{})
 }

+func (m *Sealing) handleReleaseSectorKeyFailed(ctx statemachine.Context, sector SectorInfo) error {
+	// not much we can do, wait for a bit and try again
+
+	if err := failedCooldown(ctx, sector); err != nil {
+		return err
+	}
+
+	return ctx.Send(SectorUpdateActive{})
+}
+
 func (m *Sealing) handleCommitFailed(ctx statemachine.Context, sector SectorInfo) error {
 	tok, _, err := m.Api.ChainHead(ctx.Context())
 	if err != nil {
@@ -478,7 +499,7 @@ func (m *Sealing) HandleRecoverDealIDs(ctx statemachine.Context, sector SectorIn
 }

 func (m *Sealing) handleSnapDealsRecoverDealIDs(ctx statemachine.Context, sector SectorInfo) error {
-	return m.handleRecoverDealIDsOrFailWith(ctx, sector, SectorAbortUpgrade{})
+	return m.handleRecoverDealIDsOrFailWith(ctx, sector, SectorAbortUpgrade{xerrors.New("failed recovering deal ids")})
 }

 func recoveryPiecesToFix(ctx context.Context, api SealingAPI, sector SectorInfo, maddr address.Address) ([]int, int, error) {
@@ -2,17 +2,21 @@ package sealing

 import (
 	"bytes"
+	"context"
+	"time"

+	"github.com/filecoin-project/go-state-types/abi"
 	"github.com/filecoin-project/go-state-types/big"
 	"github.com/filecoin-project/go-state-types/exitcode"
 	statemachine "github.com/filecoin-project/go-statemachine"
 	api "github.com/filecoin-project/lotus/api"
 	"github.com/filecoin-project/lotus/chain/actors/builtin/miner"
+	"github.com/filecoin-project/lotus/chain/actors/policy"
 	"golang.org/x/xerrors"
 )

 func (m *Sealing) handleReplicaUpdate(ctx statemachine.Context, sector SectorInfo) error {
-	if err := checkPieces(ctx.Context(), m.maddr, sector, m.Api); err != nil { // Sanity check state
+	if err := checkPieces(ctx.Context(), m.maddr, sector, m.Api, true); err != nil { // Sanity check state
 		return handleErrors(ctx, err, sector)
 	}
 	out, err := m.sealer.ReplicaUpdate(sector.sealingCtx(ctx.Context()), m.minerSector(sector.SectorType, sector.SectorNumber), sector.pieceInfos())
@@ -31,13 +35,28 @@ func (m *Sealing) handleProveReplicaUpdate(ctx statemachine.Context, sector Sect
 	if sector.CommR == nil {
 		return xerrors.Errorf("invalid sector %d with nil CommR", sector.SectorNumber)
 	}
+	// Abort upgrade for sectors that went faulty since being marked for upgrade
+	tok, _, err := m.Api.ChainHead(ctx.Context())
+	if err != nil {
+		log.Errorf("handleProveReplicaUpdate: api error, not proceeding: %+v", err)
+		return nil
+	}
+	active, err := sectorActive(ctx.Context(), m.Api, m.maddr, tok, sector.SectorNumber)
+	if err != nil {
+		log.Errorf("sector active check: api error, not proceeding: %+v", err)
+		return nil
+	}
+	if !active {
+		log.Errorf("sector marked for upgrade %d no longer active, aborting upgrade", sector.SectorNumber)
+		return ctx.Send(SectorAbortUpgrade{})
+	}

 	vanillaProofs, err := m.sealer.ProveReplicaUpdate1(sector.sealingCtx(ctx.Context()), m.minerSector(sector.SectorType, sector.SectorNumber), *sector.CommR, *sector.UpdateSealed, *sector.UpdateUnsealed)
 	if err != nil {
 		return ctx.Send(SectorProveReplicaUpdateFailed{xerrors.Errorf("prove replica update (1) failed: %w", err)})
 	}

-	if err := checkPieces(ctx.Context(), m.maddr, sector, m.Api); err != nil { // Sanity check state
+	if err := checkPieces(ctx.Context(), m.maddr, sector, m.Api, true); err != nil { // Sanity check state
 		return handleErrors(ctx, err, sector)
 	}

@@ -59,10 +78,6 @@ func (m *Sealing) handleSubmitReplicaUpdate(ctx statemachine.Context, sector Sec
 		return nil
 	}

-	if err := checkPieces(ctx.Context(), m.maddr, sector, m.Api); err != nil { // Sanity check state
-		return handleErrors(ctx, err, sector)
-	}
-
 	if err := checkReplicaUpdate(ctx.Context(), m.maddr, sector, tok, m.Api); err != nil {
 		return ctx.Send(SectorSubmitReplicaUpdateFailed{})
 	}
@@ -196,16 +211,76 @@ func (m *Sealing) handleReplicaUpdateWait(ctx statemachine.Context, sector Secto
 	}

 	if !si.SealedCID.Equals(*sector.UpdateSealed) {
-		log.Errorf("mismatch of expected onchain sealed cid after replica update, expected %s got %s", sector.UpdateSealed, si.SealedCID)
-		return ctx.Send(SectorAbortUpgrade{})
+		return ctx.Send(SectorAbortUpgrade{xerrors.Errorf("mismatch of expected onchain sealed cid after replica update, expected %s got %s", sector.UpdateSealed, si.SealedCID)})
 	}
 	return ctx.Send(SectorReplicaUpdateLanded{})
 }

 func (m *Sealing) handleFinalizeReplicaUpdate(ctx statemachine.Context, sector SectorInfo) error {
+	cfg, err := m.getConfig()
+	if err != nil {
+		return xerrors.Errorf("getting sealing config: %w", err)
+	}
+
+	if err := m.sealer.FinalizeReplicaUpdate(sector.sealingCtx(ctx.Context()), m.minerSector(sector.SectorType, sector.SectorNumber), sector.keepUnsealedRanges(false, cfg.AlwaysKeepUnsealedCopy)); err != nil {
+		return ctx.Send(SectorFinalizeFailed{xerrors.Errorf("finalize sector: %w", err)})
+	}
+
 	return ctx.Send(SectorFinalized{})
 }

+func (m *Sealing) handleUpdateActivating(ctx statemachine.Context, sector SectorInfo) error {
+	try := func() error {
+		mw, err := m.Api.StateWaitMsg(ctx.Context(), *sector.ReplicaUpdateMessage)
+		if err != nil {
+			return err
+		}
+
+		tok, _, err := m.Api.ChainHead(ctx.Context())
+		if err != nil {
+			return err
+		}
+
+		nv, err := m.Api.StateNetworkVersion(ctx.Context(), tok)
+		if err != nil {
+			return err
+		}
+
+		lb := policy.GetWinningPoStSectorSetLookback(nv)
+
+		targetHeight := mw.Height + lb + InteractivePoRepConfidence
+
+		return m.events.ChainAt(func(context.Context, TipSetToken, abi.ChainEpoch) error {
+			return ctx.Send(SectorUpdateActive{})
+		}, func(ctx context.Context, ts TipSetToken) error {
+			log.Warn("revert in handleUpdateActivating")
+			return nil
+		}, InteractivePoRepConfidence, targetHeight)
+	}
+
+	for {
+		err := try()
+		if err == nil {
+			break
+		}
+
+		log.Errorw("error in handleUpdateActivating", "error", err)
+
+		// likely an API issue, sleep for a bit and retry
+		time.Sleep(time.Minute)
+	}
+
+	return nil
+}
+
+func (m *Sealing) handleReleaseSectorKey(ctx statemachine.Context, sector SectorInfo) error {
+	if err := m.sealer.ReleaseSectorKey(sector.sealingCtx(ctx.Context()), m.minerSector(sector.SectorType, sector.SectorNumber)); err != nil {
+		return ctx.Send(SectorReleaseKeyFailed{err})
+	}
+
+	return ctx.Send(SectorKeyReleased{})
+}
+
 func handleErrors(ctx statemachine.Context, err error, sector SectorInfo) error {
 	switch err.(type) {
 	case *ErrApi:
@@ -198,7 +198,7 @@ func (m *Sealing) handleGetTicket(ctx statemachine.Context, sector SectorInfo) e
 }

 func (m *Sealing) handlePreCommit1(ctx statemachine.Context, sector SectorInfo) error {
-	if err := checkPieces(ctx.Context(), m.maddr, sector, m.Api); err != nil { // Sanity check state
+	if err := checkPieces(ctx.Context(), m.maddr, sector, m.Api, false); err != nil { // Sanity check state
 		switch err.(type) {
 		case *ErrApi:
 			log.Errorf("handlePreCommit1: api error, not proceeding: %+v", err)
@@ -3,6 +3,7 @@ package sealing
 import (
 	"context"

+	"github.com/filecoin-project/go-address"
 	"github.com/filecoin-project/lotus/chain/actors/builtin/miner"
 	market7 "github.com/filecoin-project/specs-actors/v7/actors/builtin/market"

@@ -86,19 +87,11 @@ func (m *Sealing) MarkForSnapUpgrade(ctx context.Context, id abi.SectorNumber) e
 		return xerrors.Errorf("failed to read sector on chain info: %w", err)
 	}

-	active, err := m.Api.StateMinerActiveSectors(ctx, m.maddr, tok)
+	active, err := sectorActive(ctx, m.Api, m.maddr, tok, id)
 	if err != nil {
-		return xerrors.Errorf("failed to check active sectors: %w", err)
+		return xerrors.Errorf("failed to check if sector is active")
 	}
-	// Ensure the upgraded sector is active
-	var found bool
-	for _, si := range active {
-		if si.SectorNumber == id {
-			found = true
-			break
-		}
-	}
-	if !found {
+	if !active {
 		return xerrors.Errorf("cannot mark inactive sector for upgrade")
 	}

@@ -110,6 +103,22 @@ func (m *Sealing) MarkForSnapUpgrade(ctx context.Context, id abi.SectorNumber) e
 	return m.sectors.Send(uint64(id), SectorStartCCUpdate{})
 }

+func sectorActive(ctx context.Context, api SealingAPI, maddr address.Address, tok TipSetToken, sector abi.SectorNumber) (bool, error) {
+	active, err := api.StateMinerActiveSectors(ctx, maddr, tok)
+	if err != nil {
+		return false, xerrors.Errorf("failed to check active sectors: %w", err)
+	}
+	// Check if sector is among active sectors
+	var found bool
+	for _, si := range active {
+		if si.SectorNumber == sector {
+			found = true
+			break
+		}
+	}
+	return found, nil
+}
+
 func (m *Sealing) tryUpgradeSector(ctx context.Context, params *miner.SectorPreCommitInfo) big.Int {
 	if len(params.DealIDs) == 0 {
 		return big.Zero()
@@ -39,7 +39,7 @@ require (
 	github.com/filecoin-project/go-fil-markets v1.19.0
 	github.com/filecoin-project/go-jsonrpc v0.1.5
 	github.com/filecoin-project/go-padreader v0.0.1
-	github.com/filecoin-project/go-paramfetch v0.0.3-0.20220111000201-e42866db1a53
+	github.com/filecoin-project/go-paramfetch v0.0.4
 	github.com/filecoin-project/go-state-types v0.1.3
 	github.com/filecoin-project/go-statemachine v1.0.1
 	github.com/filecoin-project/go-statestore v0.2.0
@@ -51,7 +51,7 @@ require (
 	github.com/filecoin-project/specs-actors/v5 v5.0.4
 	github.com/filecoin-project/specs-actors/v6 v6.0.1
 	github.com/filecoin-project/specs-actors/v7 v7.0.0-rc1
-	github.com/filecoin-project/specs-storage v0.1.1-0.20211228030229-6d460d25a0c9
+	github.com/filecoin-project/specs-storage v0.2.0
 	github.com/filecoin-project/test-vectors/schema v0.0.5
 	github.com/gbrlsnchs/jwt/v3 v3.0.1
 	github.com/gdamore/tcell/v2 v2.2.0
@@ -108,7 +108,7 @@ require (
 	github.com/kelseyhightower/envconfig v1.4.0
 	github.com/libp2p/go-buffer-pool v0.0.2
 	github.com/libp2p/go-eventbus v0.2.1
-	github.com/libp2p/go-libp2p v0.18.0-rc3
+	github.com/libp2p/go-libp2p v0.18.0-rc4
 	github.com/libp2p/go-libp2p-connmgr v0.3.1 // indirect
 	github.com/libp2p/go-libp2p-core v0.14.0
 	github.com/libp2p/go-libp2p-discovery v0.6.0
@@ -116,13 +116,13 @@ require (
 	github.com/libp2p/go-libp2p-noise v0.3.0
 	github.com/libp2p/go-libp2p-peerstore v0.6.0
 	github.com/libp2p/go-libp2p-pubsub v0.6.1
-	github.com/libp2p/go-libp2p-quic-transport v0.16.0
+	github.com/libp2p/go-libp2p-quic-transport v0.16.1
 	github.com/libp2p/go-libp2p-record v0.1.3
 	github.com/libp2p/go-libp2p-resource-manager v0.1.3
 	github.com/libp2p/go-libp2p-routing-helpers v0.2.3
 	github.com/libp2p/go-libp2p-swarm v0.10.1
 	github.com/libp2p/go-libp2p-tls v0.3.1
-	github.com/libp2p/go-libp2p-yamux v0.8.1
+	github.com/libp2p/go-libp2p-yamux v0.8.2
 	github.com/libp2p/go-maddr-filter v0.1.0
 	github.com/mattn/go-isatty v0.0.14
 	github.com/minio/blake2b-simd v0.0.0-20160723061019-3f5f724cb5b1
@@ -342,8 +342,8 @@ github.com/filecoin-project/go-padreader v0.0.0-20200903213702-ed5fae088b20/go.m
 github.com/filecoin-project/go-padreader v0.0.0-20210723183308-812a16dc01b1/go.mod h1:VYVPJqwpsfmtoHnAmPx6MUwmrK6HIcDqZJiuZhtmfLQ=
 github.com/filecoin-project/go-padreader v0.0.1 h1:8h2tVy5HpoNbr2gBRr+WD6zV6VD6XHig+ynSGJg8ZOs=
 github.com/filecoin-project/go-padreader v0.0.1/go.mod h1:VYVPJqwpsfmtoHnAmPx6MUwmrK6HIcDqZJiuZhtmfLQ=
-github.com/filecoin-project/go-paramfetch v0.0.3-0.20220111000201-e42866db1a53 h1:+nripp+UI/rhl01w9Gs4V0XDGaVPYPMGU/D/gNVLue0=
-github.com/filecoin-project/go-paramfetch v0.0.3-0.20220111000201-e42866db1a53/go.mod h1:1FH85P8U+DUEmWk1Jkw3Bw7FrwTVUNHk/95PSPG+dts=
+github.com/filecoin-project/go-paramfetch v0.0.4 h1:H+Me8EL8T5+79z/KHYQQcT8NVOzYVqXIi7nhb48tdm8=
+github.com/filecoin-project/go-paramfetch v0.0.4/go.mod h1:1FH85P8U+DUEmWk1Jkw3Bw7FrwTVUNHk/95PSPG+dts=
 github.com/filecoin-project/go-state-types v0.0.0-20200903145444-247639ffa6ad/go.mod h1:IQ0MBPnonv35CJHtWSN3YY1Hz2gkPru1Q9qoaYLxx9I=
 github.com/filecoin-project/go-state-types v0.0.0-20200928172055-2df22083d8ab/go.mod h1:ezYnPf0bNkTsDibL/psSz5dy4B5awOJ/E7P2Saeep8g=
 github.com/filecoin-project/go-state-types v0.0.0-20201102161440-c8033295a1fc/go.mod h1:ezYnPf0bNkTsDibL/psSz5dy4B5awOJ/E7P2Saeep8g=
@@ -382,8 +382,8 @@ github.com/filecoin-project/specs-actors/v7 v7.0.0-20211117170924-fd07a4c7dff9/g
 github.com/filecoin-project/specs-actors/v7 v7.0.0-20211222192039-c83bea50c402/go.mod h1:p6LIOFezA1rgRLMewbvdi3Pp6SAu+q9FtJ9CAleSjrE=
 github.com/filecoin-project/specs-actors/v7 v7.0.0-rc1 h1:FuDaXIbcw2hRsFI8SDTmsGGCE+NumpF6aiBoU/2X5W4=
 github.com/filecoin-project/specs-actors/v7 v7.0.0-rc1/go.mod h1:TA5FwCna+Yi36POaT7SLKXsgEDvJwc0V/L6ZsO19B9M=
-github.com/filecoin-project/specs-storage v0.1.1-0.20211228030229-6d460d25a0c9 h1:oUYOvF7EvdXS0Zmk9mNkaB6Bu0l+WXBYPzVodKMiLug=
-github.com/filecoin-project/specs-storage v0.1.1-0.20211228030229-6d460d25a0c9/go.mod h1:Tb88Zq+IBJbvAn3mS89GYj3jdRThBTE/771HCVZdRJU=
+github.com/filecoin-project/specs-storage v0.2.0 h1:Y4UDv0apRQ3zI2GiPPubi8JblpUZZphEdaJUxCutfyg=
+github.com/filecoin-project/specs-storage v0.2.0/go.mod h1:Tb88Zq+IBJbvAn3mS89GYj3jdRThBTE/771HCVZdRJU=
 github.com/filecoin-project/test-vectors/schema v0.0.5 h1:w3zHQhzM4pYxJDl21avXjOKBLF8egrvwUwjpT8TquDg=
 github.com/filecoin-project/test-vectors/schema v0.0.5/go.mod h1:iQ9QXLpYWL3m7warwvK1JC/pTri8mnfEmKygNDqqY6E=
 github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568/go.mod h1:xEzjJPgXI435gkrCt3MPfRiAkVrwSbHsst4LCFVfpJc=
@@ -995,8 +995,8 @@ github.com/libp2p/go-libp2p v0.14.4/go.mod h1:EIRU0Of4J5S8rkockZM7eJp2S0UrCyi55m
 github.com/libp2p/go-libp2p v0.16.0/go.mod h1:ump42BsirwAWxKzsCiFnTtN1Yc+DuPu76fyMX364/O4=
 github.com/libp2p/go-libp2p v0.17.0/go.mod h1:Fkin50rsGdv5mm5BshBUtPRZknt9esfmYXBOYcwOTgw=
 github.com/libp2p/go-libp2p v0.18.0-rc1/go.mod h1:RgYlH7IIWHXREimC92bw5Lg1V2R5XmSzuLHb5fTnr+8=
-github.com/libp2p/go-libp2p v0.18.0-rc3 h1:tI+dAFDgOCeHRF6FgvXpqbrVz+ZFabX/pXO2BUdHu4o=
-github.com/libp2p/go-libp2p v0.18.0-rc3/go.mod h1:WYL+Xw1iuwi6rdfzw5VIEpD+HqzYucHZ6fcUuumbI3M=
+github.com/libp2p/go-libp2p v0.18.0-rc4 h1:OUsSbeu7q+Ck/bV9wHDxFzb08ORqBupHhpCmRBhWrJ8=
+github.com/libp2p/go-libp2p v0.18.0-rc4/go.mod h1:wzmsk1ioOq9FGQys2BN5BIw4nugP6+R+CyW3JbPEbbs=
 github.com/libp2p/go-libp2p-asn-util v0.0.0-20200825225859-85005c6cf052/go.mod h1:nRMRTab+kZuk0LnKZpxhOVH/ndsdr2Nr//Zltc/vwgo=
 github.com/libp2p/go-libp2p-asn-util v0.1.0 h1:rABPCO77SjdbJ/eJ/ynIo8vWICy1VEnL5JAxJbQLo1E=
 github.com/libp2p/go-libp2p-asn-util v0.1.0/go.mod h1:wu+AnM9Ii2KgO5jMmS1rz9dvzTdj8BXqsPR9HR0XB7I=
@@ -1148,8 +1148,9 @@ github.com/libp2p/go-libp2p-quic-transport v0.11.2/go.mod h1:wlanzKtIh6pHrq+0U3p
 github.com/libp2p/go-libp2p-quic-transport v0.13.0/go.mod h1:39/ZWJ1TW/jx1iFkKzzUg00W6tDJh73FC0xYudjr7Hc=
 github.com/libp2p/go-libp2p-quic-transport v0.15.0/go.mod h1:wv4uGwjcqe8Mhjj7N/Ic0aKjA+/10UnMlSzLO0yRpYQ=
 github.com/libp2p/go-libp2p-quic-transport v0.15.2/go.mod h1:wv4uGwjcqe8Mhjj7N/Ic0aKjA+/10UnMlSzLO0yRpYQ=
-github.com/libp2p/go-libp2p-quic-transport v0.16.0 h1:aVg9/jr+R2esov5sH7wkXrmYmqJiUjtLMLYX3L9KYdY=
 github.com/libp2p/go-libp2p-quic-transport v0.16.0/go.mod h1:1BXjVMzr+w7EkPfiHkKnwsWjPjtfaNT0q8RS3tGDvEQ=
+github.com/libp2p/go-libp2p-quic-transport v0.16.1 h1:N/XqYXHurphPLDfXYhll8NyqzdZYQqAF4GIr7+SmLV8=
+github.com/libp2p/go-libp2p-quic-transport v0.16.1/go.mod h1:1BXjVMzr+w7EkPfiHkKnwsWjPjtfaNT0q8RS3tGDvEQ=
 github.com/libp2p/go-libp2p-record v0.0.1/go.mod h1:grzqg263Rug/sRex85QrDOLntdFAymLDLm7lxMgU79Q=
 github.com/libp2p/go-libp2p-record v0.1.0/go.mod h1:ujNc8iuE5dlKWVy6wuL6dd58t0n7xI4hAIl8pE6wu5Q=
 github.com/libp2p/go-libp2p-record v0.1.1/go.mod h1:VRgKajOyMVgP/F0L5g3kH7SVskp17vFi2xheb5uMJtg=
@@ -1229,8 +1230,9 @@ github.com/libp2p/go-libp2p-yamux v0.5.4/go.mod h1:tfrXbyaTqqSU654GTvK3ocnSZL3Bu
 github.com/libp2p/go-libp2p-yamux v0.6.0/go.mod h1:MRhd6mAYnFRnSISp4M8i0ClV/j+mWHo2mYLifWGw33k=
 github.com/libp2p/go-libp2p-yamux v0.7.0/go.mod h1:fMyA0CsPfHkIuBU0wjRGrCjTBFiXTXxG0k5M4ETv+08=
 github.com/libp2p/go-libp2p-yamux v0.8.0/go.mod h1:yTkPgN2ib8FHyU1ZcVD7aelzyAqXXwEPbyx+aSKm9h8=
-github.com/libp2p/go-libp2p-yamux v0.8.1 h1:pi7zUeZ4Z9TpbUMntvSvoP3dFD4SEw/VPybxBcOZGzg=
 github.com/libp2p/go-libp2p-yamux v0.8.1/go.mod h1:rUozF8Jah2dL9LLGyBaBeTQeARdwhefMCTQVQt6QobE=
+github.com/libp2p/go-libp2p-yamux v0.8.2 h1:6GKWntresp0TFxMP/oSoH96nV8XKJRdynXsdp43dn0Y=
+github.com/libp2p/go-libp2p-yamux v0.8.2/go.mod h1:rUozF8Jah2dL9LLGyBaBeTQeARdwhefMCTQVQt6QobE=
 github.com/libp2p/go-maddr-filter v0.0.1/go.mod h1:6eT12kSQMA9x2pvFQa+xesMKUBlj9VImZbj3B9FBH/Q=
 github.com/libp2p/go-maddr-filter v0.0.4/go.mod h1:6eT12kSQMA9x2pvFQa+xesMKUBlj9VImZbj3B9FBH/Q=
 github.com/libp2p/go-maddr-filter v0.0.5/go.mod h1:Jk+36PMfIqCJhAnaASRH83bdAvfDRp/w6ENFaC9bG+M=
@@ -30,23 +30,14 @@ func TestCCUpgrade(t *testing.T) {
 	//stm: @MINER_SECTOR_LIST_001
 	kit.QuietMiningLogs()

-	for _, height := range []abi.ChainEpoch{
-		-1,  // before
-		162, // while sealing
-		560, // after upgrade deal
-	} {
-		height := height // make linters happy by copying
-		t.Run(fmt.Sprintf("upgrade-%d", height), func(t *testing.T) {
-			runTestCCUpgrade(t, height)
-		})
-	}
+	runTestCCUpgrade(t)
 }

-func runTestCCUpgrade(t *testing.T, upgradeHeight abi.ChainEpoch) *kit.TestFullNode {
+func runTestCCUpgrade(t *testing.T) *kit.TestFullNode {
 	ctx := context.Background()
 	blockTime := 1 * time.Millisecond

-	client, miner, ens := kit.EnsembleMinimal(t, kit.GenesisNetworkVersion(network.Version15))
+	client, miner, ens := kit.EnsembleMinimal(t, kit.GenesisNetworkVersion(network.Version15), kit.ThroughRPC())
 	ens.InterconnectAll().BeginMiningMustPost(blockTime)

 	maddr, err := miner.ActorAddress(ctx)
@@ -72,7 +63,6 @@ func runTestCCUpgrade(t *testing.T, upgradeHeight abi.ChainEpoch) *kit.TestFullN
 	}
 	waitForSectorActive(ctx, t, CCUpgrade, client, maddr)

-	//stm: @SECTOR_CC_UPGRADE_001
 	err = miner.SectorMarkForUpgrade(ctx, sl[0], true)
 	require.NoError(t, err)

@@ -91,6 +81,11 @@ func runTestCCUpgrade(t *testing.T, upgradeHeight abi.ChainEpoch) *kit.TestFullN
 	status, err := miner.SectorsStatus(ctx, CCUpgrade, true)
 	require.NoError(t, err)
 	assert.Equal(t, 1, len(status.Deals))
+
+	miner.WaitSectorsProving(ctx, map[abi.SectorNumber]struct{}{
+		CCUpgrade: {},
+	})
+
 	return client
 }

@@ -137,7 +132,7 @@ func TestCCUpgradeAndPoSt(t *testing.T) {
 	kit.QuietMiningLogs()
 	t.Run("upgrade and then post", func(t *testing.T) {
 		ctx := context.Background()
-		n := runTestCCUpgrade(t, 100)
+		n := runTestCCUpgrade(t)
 		ts, err := n.ChainHead(ctx)
 		require.NoError(t, err)
 		start := ts.Height()
@@ -87,7 +87,10 @@ type TestMiner struct {

 func (tm *TestMiner) PledgeSectors(ctx context.Context, n, existing int, blockNotif <-chan struct{}) {
 	toCheck := tm.StartPledge(ctx, n, existing, blockNotif)
+	tm.WaitSectorsProving(ctx, toCheck)
+}

+func (tm *TestMiner) WaitSectorsProving(ctx context.Context, toCheck map[abi.SectorNumber]struct{}) {
 	for len(toCheck) > 0 {
 		tm.FlushSealingBatches(ctx)

@@ -105,9 +108,8 @@ func (tm *TestMiner) PledgeSectors(ctx context.Context, n, existing int, blockNo
 		}

 		build.Clock.Sleep(100 * time.Millisecond)
-		fmt.Printf("WaitSeal: %d %+v\n", len(toCheck), states)
+		fmt.Printf("WaitSectorsProving: %d %+v\n", len(toCheck), states)
 	}
-
 }

 func (tm *TestMiner) StartPledge(ctx context.Context, n, existing int, blockNotif <-chan struct{}) map[abi.SectorNumber]struct{} {
@@ -39,6 +39,7 @@ func fullRpc(t *testing.T, f *TestFullNode) *TestFullNode {
 	require.NoError(t, err)

 	srv, maddr := CreateRPCServer(t, handler, l)
+	fmt.Printf("FULLNODE RPC ENV FOR CLI DEBUGGING `export FULLNODE_API_INFO=%s`\n", "ws://"+srv.Listener.Addr().String())

 	cl, stop, err := client.NewFullNodeRPCV1(context.Background(), "ws://"+srv.Listener.Addr().String()+"/rpc/v1", nil)
 	require.NoError(t, err)
@@ -54,7 +55,9 @@ func minerRpc(t *testing.T, m *TestMiner) *TestMiner {

 	srv, maddr := CreateRPCServer(t, handler, m.RemoteListener)

-	fmt.Println("creating RPC server for", m.ActorAddr, "at: ", srv.Listener.Addr().String())
+	fmt.Printf("creating RPC server for %s at %s\n", m.ActorAddr, srv.Listener.Addr().String())
+	fmt.Printf("SP RPC ENV FOR CLI DEBUGGING `export MINER_API_INFO=%s`\n", "ws://"+srv.Listener.Addr().String())
+
 	url := "ws://" + srv.Listener.Addr().String() + "/rpc/v0"
 	cl, stop, err := client.NewStorageMinerRPCV0(context.Background(), url, nil)
 	require.NoError(t, err)
@@ -85,7 +85,7 @@ func DefaultFullNode() *FullNode {
 			Splitstore: Splitstore{
 				ColdStoreType: "universal",
 				HotStoreType:  "badger",
-				MarkSetType:   "map",
+				MarkSetType:   "badger",

 				HotStoreFullGCFrequency: 20,
 			},
@@ -156,6 +156,7 @@ func DefaultStorageMiner() *StorageMiner {
 			ConsiderVerifiedStorageDeals:   true,
 			ConsiderUnverifiedStorageDeals: true,
 			PieceCidBlocklist:              []cid.Cid{},
+			MakeNewSectorForDeals:          true,
 			// TODO: It'd be nice to set this based on sector size
 			MaxDealStartDelay:               Duration(time.Hour * 24 * 14),
 			ExpectedSealDuration:            Duration(time.Hour * 24),
@@ -239,6 +239,14 @@ Default value: 1 minute.`,
 			Comment: `Maximum expected amount of time getting the deal into a sealed sector will take
 This includes the time the deal will need to get transferred and published
 before being assigned to a sector`,
+		},
+		{
+			Name: "MakeNewSectorForDeals",
+			Type: "bool",
+
+			Comment: `Whether new sectors are created to pack incoming deals
+When this is set to false no new sectors will be created for sealing incoming deals
+This is useful for forcing all deals to be assigned as snap deals to sectors marked for upgrade`,
 		},
 		{
 			Name: "MaxDealStartDelay",
@@ -802,7 +810,7 @@ Only currently supported value is "badger".`,
 			Type: "string",

 			Comment: `MarkSetType specifies the type of the markset.
-It can be "map" (default) for in memory marking or "badger" for on-disk marking.`,
+It can be "map" for in memory marking or "badger" (default) for on-disk marking.`,
 		},
 		{
 			Name: "HotStoreMessageRetention",
@@ -120,6 +120,10 @@ type DealmakingConfig struct {
 	// This includes the time the deal will need to get transferred and published
 	// before being assigned to a sector
 	ExpectedSealDuration Duration
+	// Whether new sectors are created to pack incoming deals
+	// When this is set to false no new sectors will be created for sealing incoming deals
+	// This is useful for forcing all deals to be assigned as snap deals to sectors marked for upgrade
+	MakeNewSectorForDeals bool
 	// Maximum amount of time proposed deal StartEpoch can be in future
 	MaxDealStartDelay Duration
 	// When a deal is ready to publish, the amount of time to wait for more
@@ -359,7 +363,7 @@ type Splitstore struct {
 	// Only currently supported value is "badger".
 	HotStoreType string
 	// MarkSetType specifies the type of the markset.
-	// It can be "map" (default) for in memory marking or "badger" for on-disk marking.
+	// It can be "map" for in memory marking or "badger" (default) for on-disk marking.
 	MarkSetType string

 	// HotStoreMessageRetention specifies the retention policy for messages, in finalities beyond
@@ -391,6 +391,10 @@ func (sm *StorageMinerAPI) SectorMarkForUpgrade(ctx context.Context, id abi.Sect
 	return sm.Miner.MarkForUpgrade(ctx, id, snap)
 }

+func (sm *StorageMinerAPI) SectorAbortUpgrade(ctx context.Context, number abi.SectorNumber) error {
+	return sm.Miner.SectorAbortUpgrade(number)
+}
+
 func (sm *StorageMinerAPI) SectorCommitFlush(ctx context.Context) ([]sealiface.CommitBatchRes, error) {
 	return sm.Miner.CommitFlush(ctx)
 }
@@ -925,6 +925,8 @@ func ToSealingConfig(cfg *config.StorageMiner) sealiface.Config {
 		MaxWaitDealsSectors:             cfg.Sealing.MaxWaitDealsSectors,
 		MaxSealingSectors:               cfg.Sealing.MaxSealingSectors,
 		MaxSealingSectorsForDeals:       cfg.Sealing.MaxSealingSectorsForDeals,
+		StartEpochSealingBuffer:         abi.ChainEpoch(cfg.Dealmaking.StartEpochSealingBuffer),
+		MakeNewSectorForDeals:           cfg.Dealmaking.MakeNewSectorForDeals,
 		CommittedCapacitySectorLifetime: time.Duration(cfg.Sealing.CommittedCapacitySectorLifetime),
 		WaitDealsDelay:                  time.Duration(cfg.Sealing.WaitDealsDelay),
 		AlwaysKeepUnsealedCopy:          cfg.Sealing.AlwaysKeepUnsealedCopy,
@@ -950,8 +952,6 @@ func ToSealingConfig(cfg *config.StorageMiner) sealiface.Config {
 		TerminateBatchMax:  cfg.Sealing.TerminateBatchMax,
 		TerminateBatchMin:  cfg.Sealing.TerminateBatchMin,
 		TerminateBatchWait: time.Duration(cfg.Sealing.TerminateBatchWait),
-
-		StartEpochSealingBuffer: abi.ChainEpoch(cfg.Dealmaking.StartEpochSealingBuffer),
 	}
 }

@@ -86,6 +86,10 @@ func (m *Miner) IsMarkedForUpgrade(id abi.SectorNumber) bool {
 	return m.sealing.IsMarkedForUpgrade(id)
 }

+func (m *Miner) SectorAbortUpgrade(sectorNum abi.SectorNumber) error {
+	return m.sealing.AbortUpgrade(sectorNum)
+}
+
 func (m *Miner) SectorAddPieceToAny(ctx context.Context, size abi.UnpaddedPieceSize, r storage.Data, d api.PieceDealInfo) (api.SectorOffset, error) {
 	return m.sealing.SectorAddPieceToAny(ctx, size, r, d)
 }
@@ -1,4 +1,54 @@
 {
+  "v28-empty-sector-update-merkletree-poseidon_hasher-8-0-0-61fa69f38b9cc771ba27b670124714b4ea77fbeae05e377fb859c4a43b73a30c.params": {
+    "cid": "Qma5WL6abSqYg9uUQAZ3EHS286bsNsha7oAGsJBD48Bq2q",
+    "digest": "c3ad7bb549470b82ad52ed070aebb4f4",
+    "sector_size": 536870912
+  },
+  "v28-empty-sector-update-merkletree-poseidon_hasher-8-0-0-61fa69f38b9cc771ba27b670124714b4ea77fbeae05e377fb859c4a43b73a30c.vk": {
+    "cid": "QmUa7f9JtJMsqJJ3s3ZXk6WyF4xJLE8FiqYskZGgk8GCDv",
+    "digest": "994c5b7d450ca9da348c910689f2dc7f",
+    "sector_size": 536870912
+  },
+  "v28-empty-sector-update-merkletree-poseidon_hasher-8-0-0-92180959e1918d26350b8e6cfe217bbdd0a2d8de51ebec269078b364b715ad63.params": {
+    "cid": "QmQiT4qBGodrVNEgVTDXxBNDdPbaD8Ag7Sx3ZTq1zHX79S",
+    "digest": "5aedd2cf3e5c0a15623d56a1b43110ad",
+    "sector_size": 8388608
+  },
+  "v28-empty-sector-update-merkletree-poseidon_hasher-8-0-0-92180959e1918d26350b8e6cfe217bbdd0a2d8de51ebec269078b364b715ad63.vk": {
+    "cid": "QmdcpKUQvHM8RFRVKbk1yHfEqMcBzhtFWKRp9SNEmWq37i",
+    "digest": "abd80269054d391a734febdac0d2e687",
+    "sector_size": 8388608
+  },
+  "v28-empty-sector-update-merkletree-poseidon_hasher-8-0-0-fb9e095bebdd77511c0269b967b4d87ba8b8a525edaa0e165de23ba454510194.params": {
+    "cid": "QmYM6Hg7mjmvA3ZHTsqkss1fkdyDju5dDmLiBZGJ5pz9y9",
+    "digest": "311f92a3e75036ced01b1c0025f1fa0c",
+    "sector_size": 2048
+  },
+  "v28-empty-sector-update-merkletree-poseidon_hasher-8-0-0-fb9e095bebdd77511c0269b967b4d87ba8b8a525edaa0e165de23ba454510194.vk": {
+    "cid": "QmaQsTLL3nc5dw6wAvaioJSBfd1jhQrA2o6ucFf7XeV74P",
+    "digest": "eadad9784969890d30f2749708c79771",
+    "sector_size": 2048
+  },
+  "v28-empty-sector-update-merkletree-poseidon_hasher-8-8-0-3b7f44a9362e3985369454947bc94022e118211e49fd672d52bec1cbfd599d18.params": {
+    "cid": "QmNPc75iEfcahCwNKdqnWLtxnjspUGGR4iscjiz3wP3RtS",
+    "digest": "1b3cfd761a961543f9eb273e435a06a2",
+    "sector_size": 34359738368
+  },
+  "v28-empty-sector-update-merkletree-poseidon_hasher-8-8-0-3b7f44a9362e3985369454947bc94022e118211e49fd672d52bec1cbfd599d18.vk": {
+    "cid": "QmdFFUe1gcz9MMHc6YW8aoV48w4ckvcERjt7PkydQAMfCN",
+    "digest": "3a6941983754737fde880d29c7094905",
+    "sector_size": 34359738368
+  },
+  "v28-empty-sector-update-merkletree-poseidon_hasher-8-8-2-102e1444a7e9a97ebf1e3d6855dcc77e66c011ea66f936d9b2c508f87f2f83a7.params": {
+    "cid": "QmUB6xTVjzBQGuDNeyJMrrJ1byk58vhPm8eY2Lv9pgwanp",
+    "digest": "1a392e7b759fb18e036c7559b5ece816",
+    "sector_size": 68719476736
+  },
+  "v28-empty-sector-update-merkletree-poseidon_hasher-8-8-2-102e1444a7e9a97ebf1e3d6855dcc77e66c011ea66f936d9b2c508f87f2f83a7.vk": {
+    "cid": "Qmd794Jty7k26XJ8Eg4NDEks65Qk8G4GVfGkwqvymv8HAg",
+    "digest": "80e366df2f1011953c2d01c7b7c9ee8e",
+    "sector_size": 68719476736
+  },
  "v28-proof-of-spacetime-fallback-merkletree-poseidon_hasher-8-0-0-0170db1f394b35d995252228ee359194b13199d259380541dc529fb0099096b0.params": {
    "cid": "QmVxjFRyhmyQaZEtCh7nk2abc7LhFkzhnRX4rcHqCCpikR",
    "digest": "7610b9f82bfc88405b7a832b651ce2f6",
@@ -8,8 +8,8 @@ require (
 	github.com/davecgh/go-spew v1.1.1
 	github.com/drand/drand v1.3.0
 	github.com/filecoin-project/go-address v0.0.6
-	github.com/filecoin-project/go-data-transfer v1.12.1
-	github.com/filecoin-project/go-fil-markets v1.14.1
+	github.com/filecoin-project/go-data-transfer v1.14.0
+	github.com/filecoin-project/go-fil-markets v1.19.0
 	github.com/filecoin-project/go-jsonrpc v0.1.5
 	github.com/filecoin-project/go-state-types v0.1.3
 	github.com/filecoin-project/go-storedcounter v0.1.0
@@ -23,15 +23,15 @@ require (
 	github.com/ipfs/go-datastore v0.5.1
 	github.com/ipfs/go-ipfs-files v0.0.9
 	github.com/ipfs/go-ipld-format v0.2.0
-	github.com/ipfs/go-log/v2 v2.4.0
+	github.com/ipfs/go-log/v2 v2.5.0
 	github.com/ipfs/go-merkledag v0.5.1
-	github.com/ipfs/go-unixfs v0.2.6
+	github.com/ipfs/go-unixfs v0.3.1
 	github.com/ipld/go-car v0.3.3
 	github.com/kpacha/opencensus-influxdb v0.0.0-20181102202715-663e2683a27c
-	github.com/libp2p/go-libp2p v0.17.0
-	github.com/libp2p/go-libp2p-core v0.13.0
+	github.com/libp2p/go-libp2p v0.18.0-rc4
+	github.com/libp2p/go-libp2p-core v0.14.0
 	github.com/libp2p/go-libp2p-pubsub-tracer v0.0.0-20200626141350-e730b32bf1e6
-	github.com/multiformats/go-multiaddr v0.4.1
+	github.com/multiformats/go-multiaddr v0.5.0
 	github.com/testground/sdk-go v0.2.6
 	go.opencensus.io v0.23.0
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
@@ -133,6 +133,8 @@ github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuy
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
+github.com/alecthomas/units v0.0.0-20210927113745-59d0afb8317a h1:E/8AP5dFtMhl5KPJz66Kt9G0n+7Sn41Fy1wv9/jHOrc=
+github.com/alecthomas/units v0.0.0-20210927113745-59d0afb8317a/go.mod h1:OMCwj8VM1Kc9e19TLln2VL61YJF0x1XFtfdL4JdbSyE=
 github.com/andreyvit/diff v0.0.0-20170406064948-c7f18ee00883/go.mod h1:rCTlJbsFo29Kk6CurOXKm700vrz8f0KW0JNfpkRJY/8=
 github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239/go.mod h1:2FmKhYUyUczH0OGQWaF5ceTx0UBShxjsH6f8oGKYe2c=
 github.com/antihax/optional v0.0.0-20180407024304-ca021399b1a6/go.mod h1:V8iCPQYkqmusNa815XgQio277wI47sdRh1dUOLdyC6Q=
@@ -405,19 +407,19 @@ github.com/filecoin-project/go-commp-utils v0.1.3/go.mod h1:3ENlD1pZySaUout0p9AN
 github.com/filecoin-project/go-crypto v0.0.0-20191218222705-effae4ea9f03/go.mod h1:+viYnvGtUTgJRdy6oaeF4MTFKAfatX071MPDPBL11EQ=
 github.com/filecoin-project/go-crypto v0.0.1 h1:AcvpSGGCgjaY8y1az6AMfKQWreF/pWO2JJGLl6gCq6o=
 github.com/filecoin-project/go-crypto v0.0.1/go.mod h1:+viYnvGtUTgJRdy6oaeF4MTFKAfatX071MPDPBL11EQ=
-github.com/filecoin-project/go-data-transfer v1.12.0/go.mod h1:tDrD2jLU2TpVhd+5B8iqBp0fQRV4lP80WZccKXugjYc=
-github.com/filecoin-project/go-data-transfer v1.12.1 h1:gAznAZKySVs2FS6T/vDq7R3f0DewLnxeROe0oOE6bZU=
-github.com/filecoin-project/go-data-transfer v1.12.1/go.mod h1:j3HL645YiQFxcM+q7uPlGApILSqeweDABNgZQP7pDYU=
-github.com/filecoin-project/go-ds-versioning v0.0.0-20211206185234-508abd7c2aff h1:2bG2ggVZ/rInd/YqUfRj4A5siGuYOPxxuD4I8nYLJF0=
+github.com/filecoin-project/go-data-transfer v1.14.0 h1:4pnfJk8FYtqcdAg+QRGzaz57seUC/Tz+HJgPuGB7zdg=
+github.com/filecoin-project/go-data-transfer v1.14.0/go.mod h1:wNJKhaLLYBJDM3VFvgvYi4iUjPa69pz/1Q5Q4HzX2wE=
 github.com/filecoin-project/go-ds-versioning v0.0.0-20211206185234-508abd7c2aff/go.mod h1:C9/l9PnB1+mwPa26BBVpCjG/XQCB0yj/q5CK2J8X1I4=
+github.com/filecoin-project/go-ds-versioning v0.1.1 h1:JiyBqaQlwC+UM0WhcBtVEeT3XrX59mQhT8U3p7nu86o=
+github.com/filecoin-project/go-ds-versioning v0.1.1/go.mod h1:C9/l9PnB1+mwPa26BBVpCjG/XQCB0yj/q5CK2J8X1I4=
 github.com/filecoin-project/go-fil-commcid v0.0.0-20200716160307-8f644712406f/go.mod h1:Eaox7Hvus1JgPrL5+M3+h7aSPHc0cVqpSxA+TxIEpZQ=
 github.com/filecoin-project/go-fil-commcid v0.0.0-20201016201715-d41df56b4f6a/go.mod h1:Eaox7Hvus1JgPrL5+M3+h7aSPHc0cVqpSxA+TxIEpZQ=
 github.com/filecoin-project/go-fil-commcid v0.1.0 h1:3R4ds1A9r6cr8mvZBfMYxTS88OqLYEo6roi+GiIeOh8=
 github.com/filecoin-project/go-fil-commcid v0.1.0/go.mod h1:Eaox7Hvus1JgPrL5+M3+h7aSPHc0cVqpSxA+TxIEpZQ=
 github.com/filecoin-project/go-fil-commp-hashhash v0.1.0 h1:imrrpZWEHRnNqqv0tN7LXep5bFEVOVmQWHJvl2mgsGo=
 github.com/filecoin-project/go-fil-commp-hashhash v0.1.0/go.mod h1:73S8WSEWh9vr0fDJVnKADhfIv/d6dCbAGaAGWbdJEI8=
-github.com/filecoin-project/go-fil-markets v1.14.1 h1:Bx+TSbkAN8K97Hpjgu+MpeRFbXIKH/fNpNp1ZGAEH3I=
-github.com/filecoin-project/go-fil-markets v1.14.1/go.mod h1:vXOHH3q2+zLk929W+lIq3etuDFTyJJ8nG2DwGHG2R1E=
+github.com/filecoin-project/go-fil-markets v1.19.0 h1:kap2q2wTM6tfkVO5gMA5DD9GUeTvkDhMfhjCtEwMDM8=
+github.com/filecoin-project/go-fil-markets v1.19.0/go.mod h1:qsb3apmo4RSJYCEq40QxVdU7UZospN6nFJLOBHuaIbc=
 github.com/filecoin-project/go-hamt-ipld v0.1.5 h1:uoXrKbCQZ49OHpsTCkrThPNelC4W3LPEk0OrS/ytIBM=
 github.com/filecoin-project/go-hamt-ipld v0.1.5/go.mod h1:6Is+ONR5Cd5R6XZoCse1CWaXZc0Hdb/JeX+EQCQzX24=
 github.com/filecoin-project/go-hamt-ipld/v2 v2.0.0 h1:b3UDemBYN2HNfk3KOXNuxgTTxlWi3xVvbQP0IT38fvM=
@@ -431,8 +433,8 @@ github.com/filecoin-project/go-padreader v0.0.0-20200903213702-ed5fae088b20/go.m
 github.com/filecoin-project/go-padreader v0.0.0-20210723183308-812a16dc01b1/go.mod h1:VYVPJqwpsfmtoHnAmPx6MUwmrK6HIcDqZJiuZhtmfLQ=
 github.com/filecoin-project/go-padreader v0.0.1 h1:8h2tVy5HpoNbr2gBRr+WD6zV6VD6XHig+ynSGJg8ZOs=
 github.com/filecoin-project/go-padreader v0.0.1/go.mod h1:VYVPJqwpsfmtoHnAmPx6MUwmrK6HIcDqZJiuZhtmfLQ=
-github.com/filecoin-project/go-paramfetch v0.0.3-0.20220111000201-e42866db1a53 h1:+nripp+UI/rhl01w9Gs4V0XDGaVPYPMGU/D/gNVLue0=
-github.com/filecoin-project/go-paramfetch v0.0.3-0.20220111000201-e42866db1a53/go.mod h1:1FH85P8U+DUEmWk1Jkw3Bw7FrwTVUNHk/95PSPG+dts=
+github.com/filecoin-project/go-paramfetch v0.0.4 h1:H+Me8EL8T5+79z/KHYQQcT8NVOzYVqXIi7nhb48tdm8=
+github.com/filecoin-project/go-paramfetch v0.0.4/go.mod h1:1FH85P8U+DUEmWk1Jkw3Bw7FrwTVUNHk/95PSPG+dts=
 github.com/filecoin-project/go-state-types v0.0.0-20200903145444-247639ffa6ad/go.mod h1:IQ0MBPnonv35CJHtWSN3YY1Hz2gkPru1Q9qoaYLxx9I=
 github.com/filecoin-project/go-state-types v0.0.0-20200928172055-2df22083d8ab/go.mod h1:ezYnPf0bNkTsDibL/psSz5dy4B5awOJ/E7P2Saeep8g=
 github.com/filecoin-project/go-state-types v0.0.0-20201102161440-c8033295a1fc/go.mod h1:ezYnPf0bNkTsDibL/psSz5dy4B5awOJ/E7P2Saeep8g=
@@ -879,6 +881,8 @@ github.com/influxdata/usage-client v0.0.0-20160829180054-6d3895376368/go.mod h1:
 github.com/ipfs/bbloom v0.0.1/go.mod h1:oqo8CVWsJFMOZqTglBG4wydCE4IQA/G2/SEofB0rjUI=
 github.com/ipfs/bbloom v0.0.4 h1:Gi+8EGJ2y5qiD5FbsbpX/TMNcJw8gSqr7eyjHa4Fhvs=
 github.com/ipfs/bbloom v0.0.4/go.mod h1:cS9YprKXpoZ9lT0n/Mw/a6/aFV6DTjTLYHeA+gyqMG0=
+github.com/ipfs/go-bitfield v1.0.0 h1:y/XHm2GEmD9wKngheWNNCNL0pzrWXZwCdQGv1ikXknQ=
+github.com/ipfs/go-bitfield v1.0.0/go.mod h1:N/UiujQy+K+ceU1EF5EkVd1TNqevLrCQMIcAEPrdtus=
 github.com/ipfs/go-bitswap v0.0.9/go.mod h1:kAPf5qgn2W2DrgAcscZ3HrM9qh4pH+X8Fkk3UPrwvis=
 github.com/ipfs/go-bitswap v0.1.0/go.mod h1:FFJEf18E9izuCqUtHxbWEvq+reg7o4CW5wSAE1wsxj0=
 github.com/ipfs/go-bitswap v0.1.2/go.mod h1:qxSWS4NXGs7jQ6zQvoPY3+NmOfHHG47mhkiLzBpJQIs=
@@ -914,7 +918,6 @@ github.com/ipfs/go-datastore v0.4.0/go.mod h1:SX/xMIKoCszPqp+z9JhPYCmoOoXTvaa13X
 github.com/ipfs/go-datastore v0.4.1/go.mod h1:SX/xMIKoCszPqp+z9JhPYCmoOoXTvaa13XEbGtsFUhA=
 github.com/ipfs/go-datastore v0.4.4/go.mod h1:SX/xMIKoCszPqp+z9JhPYCmoOoXTvaa13XEbGtsFUhA=
 github.com/ipfs/go-datastore v0.4.5/go.mod h1:eXTcaaiN6uOlVCLS9GjJUJtlvJfM3xk23w3fyfrmmJs=
-github.com/ipfs/go-datastore v0.4.7-0.20211013204805-28a3721c2e66/go.mod h1:9zhEApYMTl17C8YDp7JmU7sQZi2/wqiYh73hakZ90Bk=
 github.com/ipfs/go-datastore v0.5.0/go.mod h1:9zhEApYMTl17C8YDp7JmU7sQZi2/wqiYh73hakZ90Bk=
 github.com/ipfs/go-datastore v0.5.1 h1:WkRhLuISI+XPD0uk3OskB0fYFSyqK8Ob5ZYew9Qa1nQ=
 github.com/ipfs/go-datastore v0.5.1/go.mod h1:9zhEApYMTl17C8YDp7JmU7sQZi2/wqiYh73hakZ90Bk=
@@ -942,13 +945,11 @@ github.com/ipfs/go-filestore v1.1.0 h1:Pu4tLBi1bucu6/HU9llaOmb9yLFk/sgP+pW764zND
 github.com/ipfs/go-filestore v1.1.0/go.mod h1:6e1/5Y6NvLuCRdmda/KA4GUhXJQ3Uat6vcWm2DJfxc8=
 github.com/ipfs/go-fs-lock v0.0.6 h1:sn3TWwNVQqSeNjlWy6zQ1uUGAZrV3hPOyEA6y1/N2a0=
 github.com/ipfs/go-fs-lock v0.0.6/go.mod h1:OTR+Rj9sHiRubJh3dRhD15Juhd/+w6VPOY28L7zESmM=
-github.com/ipfs/go-graphsync v0.11.0/go.mod h1:wC+c8vGVjAHthsVIl8LKr37cUra2GOaMYcQNNmMxDqE=
-github.com/ipfs/go-graphsync v0.11.5 h1:WA5hVxGBtcal6L6nqubKiqRolaZxbexOK3GumGFJRR4=
-github.com/ipfs/go-graphsync v0.11.5/go.mod h1:+/sZqRwRCQRrV7NCzgBtufmr5QGpUE98XSa7NlsztmM=
+github.com/ipfs/go-graphsync v0.12.0 h1:QCsVHVzb9FTkcm3NEa8GjXnUeGit1L9s08HcSVQ4m/g=
+github.com/ipfs/go-graphsync v0.12.0/go.mod h1:nASYWYETgsnMbQ3+DirNImOHQ8TY0a5AhAqyOY55tUg=
 github.com/ipfs/go-ipfs-blockstore v0.0.1/go.mod h1:d3WClOmRQKFnJ0Jz/jj/zmksX0ma1gROTlovZKBmN08=
 github.com/ipfs/go-ipfs-blockstore v0.1.0/go.mod h1:5aD0AvHPi7mZc6Ci1WCAhiBQu2IsfTduLl+422H6Rqw=
 github.com/ipfs/go-ipfs-blockstore v0.2.1/go.mod h1:jGesd8EtCM3/zPgx+qr0/feTXGUeRai6adgwC+Q+JvE=
-github.com/ipfs/go-ipfs-blockstore v1.1.0/go.mod h1:5QDUApRqpgPcfGstCxYeMnjt/DYQtXXdJVCvxHHuWVk=
 github.com/ipfs/go-ipfs-blockstore v1.1.1/go.mod h1:w51tNR9y5+QXB0wkNcHt4O2aSZjTdqaEWaQdSxEyUOY=
 github.com/ipfs/go-ipfs-blockstore v1.1.2 h1:WCXoZcMYnvOTmlpX+RSSnhVN0uCmbWTeepTGX5lgiXw=
 github.com/ipfs/go-ipfs-blockstore v1.1.2/go.mod h1:w51tNR9y5+QXB0wkNcHt4O2aSZjTdqaEWaQdSxEyUOY=
@@ -966,7 +967,6 @@ github.com/ipfs/go-ipfs-delay v0.0.1 h1:r/UXYyRcddO6thwOnhiznIAiSvxMECGgtv35Xs1I
 github.com/ipfs/go-ipfs-delay v0.0.1/go.mod h1:8SP1YXK1M1kXuc4KJZINY3TQQ03J2rwBG9QfXmbRPrw=
 github.com/ipfs/go-ipfs-ds-help v0.0.1/go.mod h1:gtP9xRaZXqIQRh1HRpp595KbBEdgqWFxefeVKOV8sxo=
 github.com/ipfs/go-ipfs-ds-help v0.1.1/go.mod h1:SbBafGJuGsPI/QL3j9Fc5YPLeAu+SzOkI0gFwAg+mOs=
-github.com/ipfs/go-ipfs-ds-help v1.0.0/go.mod h1:ujAbkeIgkKAWtxxNkoZHWLCyk5JpPoKnGyCcsoF6ueE=
 github.com/ipfs/go-ipfs-ds-help v1.1.0 h1:yLE2w9RAsl31LtfMt91tRZcrx+e61O5mDxFRR994w4Q=
 github.com/ipfs/go-ipfs-ds-help v1.1.0/go.mod h1:YR5+6EaebOhfcqVCyqemItCLthrpVNot+rsOU/5IatU=
 github.com/ipfs/go-ipfs-exchange-interface v0.0.1/go.mod h1:c8MwfHjtQjPoDyiy9cFquVtVHkO9b9Ob3FG91qJnWCM=
@@ -1028,8 +1028,9 @@ github.com/ipfs/go-log/v2 v2.1.2-0.20200626104915-0016c0b4b3e4/go.mod h1:2v2nsGf
 github.com/ipfs/go-log/v2 v2.1.2/go.mod h1:2v2nsGfZsvvAJz13SyFzf9ObaqwHiHxsPLEHntrv9KM=
 github.com/ipfs/go-log/v2 v2.1.3/go.mod h1:/8d0SH3Su5Ooc31QlL1WysJhvyOTDCjcCZ9Axpmri6g=
 github.com/ipfs/go-log/v2 v2.3.0/go.mod h1:QqGoj30OTpnKaG/LKTGTxoP2mmQtjVMEnK72gynbe/g=
-github.com/ipfs/go-log/v2 v2.4.0 h1:iR/2o9PGWanVJrBgIH5Ff8mPGOwpqLaPIAFqSnsdlzk=
 github.com/ipfs/go-log/v2 v2.4.0/go.mod h1:nPZnh7Cj7lwS3LpRU5Mwr2ol1c2gXIEXuF6aywqrtmo=
+github.com/ipfs/go-log/v2 v2.5.0 h1:+MhAooFd9XZNvR0i9FriKW6HB0ql7HNXUuflWtc0dd4=
+github.com/ipfs/go-log/v2 v2.5.0/go.mod h1:prSpmC1Gpllc9UYWxDiZDreBYw7zp4Iqp1kOLU9U5UI=
 github.com/ipfs/go-merkledag v0.0.6/go.mod h1:QYPdnlvkOg7GnQRofu9XZimC5ZW5Wi3bKys/4GQQfto=
 github.com/ipfs/go-merkledag v0.2.3/go.mod h1:SQiXrtSts3KGNmgOzMICy5c0POOpUNQLvB3ClKnBAlk=
 github.com/ipfs/go-merkledag v0.2.4/go.mod h1:SQiXrtSts3KGNmgOzMICy5c0POOpUNQLvB3ClKnBAlk=
@@ -1049,8 +1050,10 @@ github.com/ipfs/go-peertaskqueue v0.7.1/go.mod h1:M/akTIE/z1jGNXMU7kFB4TeSEFvj68
 github.com/ipfs/go-todocounter v0.0.1/go.mod h1:l5aErvQc8qKE2r7NDMjmq5UNAvuZy0rC8BHOplkWvZ4=
 github.com/ipfs/go-unixfs v0.2.2-0.20190827150610-868af2e9e5cb/go.mod h1:IwAAgul1UQIcNZzKPYZWOCijryFBeCV79cNubPzol+k=
 github.com/ipfs/go-unixfs v0.2.4/go.mod h1:SUdisfUjNoSDzzhGVxvCL9QO/nKdwXdr+gbMUdqcbYw=
-github.com/ipfs/go-unixfs v0.2.6 h1:gq3U3T2vh8x6tXhfo3uSO3n+2z4yW0tYtNgVP/3sIyA=
-github.com/ipfs/go-unixfs v0.2.6/go.mod h1:GTTzQvaZsTZARdNkkdjDKFFnBhmO3e5mIM1PkH/x4p0=
+github.com/ipfs/go-unixfs v0.3.1 h1:LrfED0OGfG98ZEegO4/xiprx2O+yS+krCMQSp7zLVv8=
+github.com/ipfs/go-unixfs v0.3.1/go.mod h1:h4qfQYzghiIc8ZNFKiLMFWOTzrWIAtzYQ59W/pCFf1o=
+github.com/ipfs/go-unixfsnode v1.2.0 h1:tHHBJftsJyHGa8bS62PpkYNqHy/Sug3c/vxxC8NaGQY=
+github.com/ipfs/go-unixfsnode v1.2.0/go.mod h1:mQEgLjxkV/1mohkC4p7taRRBYPBeXu97SA3YaerT2q0=
 github.com/ipfs/go-verifcid v0.0.1 h1:m2HI7zIuR5TFyQ1b79Da5N9dnnCP1vcu2QqawmWlK2E=
 github.com/ipfs/go-verifcid v0.0.1/go.mod h1:5Hrva5KBeIog4A+UpqlaIU+DEstipcJYQQZc0g37pY0=
 github.com/ipfs/interface-go-ipfs-core v0.4.0 h1:+mUiamyHIwedqP8ZgbCIwpy40oX7QcXUbo4CZOeJVJg=
@@ -1074,11 +1077,10 @@ github.com/ipld/go-ipld-prime v0.9.0/go.mod h1:KvBLMr4PX1gWptgkzRjVZCrLmSGcZCb/j
 github.com/ipld/go-ipld-prime v0.9.1-0.20210324083106-dc342a9917db/go.mod h1:KvBLMr4PX1gWptgkzRjVZCrLmSGcZCb/jioOQwCqZN8=
 github.com/ipld/go-ipld-prime v0.10.0/go.mod h1:KvBLMr4PX1gWptgkzRjVZCrLmSGcZCb/jioOQwCqZN8=
 github.com/ipld/go-ipld-prime v0.11.0/go.mod h1:+WIAkokurHmZ/KwzDOMUuoeJgaRQktHtEaLglS3ZeV8=
-github.com/ipld/go-ipld-prime v0.12.3/go.mod h1:PaeLYq8k6dJLmDUSLrzkEpoGV4PEfe/1OtFN/eALOc8=
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@@ -1248,7 +1251,6 @@ github.com/libp2p/go-libp2p-autonat v0.2.2/go.mod h1:HsM62HkqZmHR2k1xgX34WuWDzk/
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@@ -1306,8 +1310,9 @@ github.com/libp2p/go-libp2p-core v0.9.0/go.mod h1:ESsbz31oC3C1AvMJoGx26RTuCkNhmk
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@@ -1343,8 +1348,9 @@ github.com/libp2p/go-libp2p-mplex v0.2.1/go.mod h1:SC99Rxs8Vuzrf/6WhmH41kNn13TiY
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@@ -1383,8 +1389,9 @@ github.com/libp2p/go-libp2p-protocol v0.0.1/go.mod h1:Af9n4PiruirSDjHycM1QuiMi/1
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@@ -1422,8 +1434,10 @@ github.com/libp2p/go-libp2p-swarm v0.3.0/go.mod h1:hdv95GWCTmzkgeJpP+GK/9D9puJeg
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@@ -1435,8 +1449,9 @@ github.com/libp2p/go-libp2p-testing v0.3.0/go.mod h1:efZkql4UZ7OVsEfaxNHZPzIehts
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@@ -1451,8 +1466,10 @@ github.com/libp2p/go-libp2p-transport-upgrader v0.4.2/go.mod h1:NR8ne1VwfreD5VIW
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@@ -1466,8 +1483,11 @@ github.com/libp2p/go-libp2p-yamux v0.4.0/go.mod h1:+DWDjtFMzoAwYLVkNZftoucn7PelN
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@@ -1479,8 +1499,9 @@ github.com/libp2p/go-mplex v0.1.0/go.mod h1:SXgmdki2kwCUlCCbfGLEgHjC4pFqhTp0ZoV6
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@@ -1495,8 +1516,9 @@ github.com/libp2p/go-nat v0.1.0/go.mod h1:X7teVkwRHNInVNWQiO/tAiAVRwSr5zoRz4YSTC
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@@ -1515,14 +1537,14 @@ github.com/libp2p/go-reuseport-transport v0.1.0 h1:C3PHeHjmnz8m6f0uydObj02tMEoi7
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@@ -1530,8 +1552,9 @@ github.com/libp2p/go-tcp-transport v0.2.0/go.mod h1:vX2U0CnWimU4h0SGSEsg++AzvBcr
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@@ -1541,8 +1564,9 @@ github.com/libp2p/go-ws-transport v0.2.0/go.mod h1:9BHJz/4Q5A9ludYWKoGCFC5gUElzl
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@@ -1554,8 +1578,10 @@ github.com/libp2p/go-yamux v1.4.0/go.mod h1:fr7aVgmdNGJK+N1g+b6DW6VxzbRCjCOejR/h
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@@ -1564,8 +1590,9 @@ github.com/lucas-clemente/quic-go v0.16.0/go.mod h1:I0+fcNTdb9eS1ZcjQZbDVPGchJ86
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@@ -1597,6 +1624,8 @@ github.com/marten-seemann/qtls-go1-16 v0.1.4/go.mod h1:gNpI2Ol+lRS3WwSOtIUUtRwZE
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@@ -1709,8 +1738,9 @@ github.com/multiformats/go-multiaddr v0.3.0/go.mod h1:dF9kph9wfJ+3VLAaeBqo9Of8x4
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@@ -1735,8 +1765,9 @@ github.com/multiformats/go-multibase v0.0.3 h1:l/B6bJDQjvQ5G52jw4QGSYeOTZoAwIO77
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@@ -1842,6 +1873,8 @@ github.com/pact-foundation/pact-go v1.0.4/go.mod h1:uExwJY4kCzNPcHRj+hCR/HBbOOIw
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@@ -2908,4 +2941,4 @@ sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
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