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move the parent lookup process to a dedicated thread (#906)

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* Upgrade the parent lookup logic

* Apply reviewer suggestions

* move the parent lookup process to a dedicated thread

* move the logic of parent lookup and range syncing to a block processor

* review suggestions

* more review suggestions

* Add small logging changes

* Process parent lookups in reverse

Co-authored-by: Age Manning <Age@AgeManning.com>
This commit is contained in:
divma 2020-03-22 20:07:41 -05:00 committed by GitHub
parent a5fbaef469
commit 47aef629d1
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GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 157 additions and 133 deletions
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105
beacon_node/network/src/sync/range_sync/batch_processing.rs → beacon_node/network/src/sync/block_processor.rs
View File

@ -1,12 +1,23 @@
use super::batch::Batch;
use crate::message_processor::FUTURE_SLOT_TOLERANCE;
use crate::sync::manager::SyncMessage;
use crate::sync::range_sync::BatchId;
use beacon_chain::{BeaconChain, BeaconChainTypes, BlockProcessingOutcome};
use eth2_libp2p::PeerId;
use slog::{debug, error, trace, warn};
use std::sync::{Arc, Weak};
use tokio::sync::mpsc;
use types::SignedBeaconBlock;
/// The result of attempting to process a batch of blocks.
/// Id associated to a block processing request, either a batch or a single block.
#[derive(Clone, Debug, PartialEq)]
pub enum ProcessId {
/// Processing Id of a range syncing batch.
RangeBatchId(BatchId),
/// Processing Id of the parent lookup of a block
ParentLookup(PeerId),
}
/// The result of a block processing request.
// TODO: When correct batch error handling occurs, we will include an error type.
#[derive(Debug)]
pub enum BatchProcessResult {
@ -16,46 +27,81 @@ pub enum BatchProcessResult {
Failed,
}
// TODO: Refactor to async fn, with stable futures
pub fn spawn_batch_processor<T: BeaconChainTypes>(
/// Spawns a thread handling the block processing of a request: range syncing or parent lookup.
pub fn spawn_block_processor<T: BeaconChainTypes>(
chain: Weak<BeaconChain<T>>,
process_id: u64,
batch: Batch<T::EthSpec>,
process_id: ProcessId,
downloaded_blocks: Vec<SignedBeaconBlock<T::EthSpec>>,
mut sync_send: mpsc::UnboundedSender<SyncMessage<T::EthSpec>>,
log: slog::Logger,
) {
std::thread::spawn(move || {
debug!(log, "Processing batch"; "id" => *batch.id);
let result = match process_batch(chain, &batch, &log) {
Ok(_) => BatchProcessResult::Success,
Err(_) => BatchProcessResult::Failed,
};
match process_id {
// this a request from the range sync
ProcessId::RangeBatchId(batch_id) => {
debug!(log, "Processing batch"; "id" => *batch_id, "blocks" => downloaded_blocks.len());
let result = match process_blocks(chain, downloaded_blocks.iter(), &log) {
Ok(_) => {
debug!(log, "Batch processed"; "id" => *batch_id );
BatchProcessResult::Success
}
Err(e) => {
debug!(log, "Batch processing failed"; "id" => *batch_id, "error" => e);
BatchProcessResult::Failed
}
};
debug!(log, "Batch processed"; "id" => *batch.id, "result" => format!("{:?}", result));
sync_send
.try_send(SyncMessage::BatchProcessed {
process_id,
batch: Box::new(batch),
result,
})
.unwrap_or_else(|_| {
debug!(
log,
"Batch result could not inform sync. Likely shutting down."
);
});
let msg = SyncMessage::BatchProcessed {
batch_id: batch_id,
downloaded_blocks: downloaded_blocks,
result,
};
sync_send.try_send(msg).unwrap_or_else(|_| {
debug!(
log,
"Block processor could not inform range sync result. Likely shutting down."
);
});
}
// this a parent lookup request from the sync manager
ProcessId::ParentLookup(peer_id) => {
debug!(log, "Processing parent lookup"; "last_peer_id" => format!("{}", peer_id), "blocks" => downloaded_blocks.len());
// parent blocks are ordered from highest slot to lowest, so we need to process in
// reverse
match process_blocks(chain, downloaded_blocks.iter().rev(), &log) {
Err(e) => {
warn!(log, "Parent lookup failed"; "last_peer_id" => format!("{}", peer_id), "error" => e);
sync_send
.try_send(SyncMessage::ParentLookupFailed(peer_id))
.unwrap_or_else(|_| {
// on failure, inform to downvote the peer
debug!(
log,
"Block processor could not inform parent lookup result. Likely shutting down."
);
});
}
Ok(_) => {
debug!(log, "Parent lookup processed successfully");
}
}
}
}
});
}
// Helper function to process block batches which only consumes the chain and blocks to process
fn process_batch<T: BeaconChainTypes>(
/// Helper function to process blocks batches which only consumes the chain and blocks to process.
fn process_blocks<
'a,
T: BeaconChainTypes,
I: Iterator<Item = &'a SignedBeaconBlock<T::EthSpec>>,
>(
chain: Weak<BeaconChain<T>>,
batch: &Batch<T::EthSpec>,
downloaded_blocks: I,
log: &slog::Logger,
) -> Result<(), String> {
let mut successful_block_import = false;
for block in &batch.downloaded_blocks {
for block in downloaded_blocks {
if let Some(chain) = chain.upgrade() {
let processing_result = chain.process_block(block.clone());
@ -72,6 +118,7 @@ fn process_batch<T: BeaconChainTypes>(
}
BlockProcessingOutcome::ParentUnknown { parent, .. } => {
// blocks should be sequential and all parents should exist
// this is a failure if blocks do not have parents
warn!(
log, "Parent block is unknown";
"parent_root" => format!("{}", parent),

95
beacon_node/network/src/sync/manager.rs
View File

@ -33,8 +33,9 @@
//! if an attestation references an unknown block) this manager can search for the block and
//! subsequently search for parents if needed.
use super::block_processor::{spawn_block_processor, BatchProcessResult, ProcessId};
use super::network_context::SyncNetworkContext;
use super::range_sync::{Batch, BatchProcessResult, RangeSync};
use super::range_sync::{BatchId, RangeSync};
use crate::message_processor::PeerSyncInfo;
use crate::service::NetworkMessage;
use beacon_chain::{BeaconChain, BeaconChainTypes, BlockProcessingOutcome};
@ -99,10 +100,13 @@ pub enum SyncMessage<T: EthSpec> {
/// A batch has been processed by the block processor thread.
BatchProcessed {
process_id: u64,
batch: Box<Batch<T>>,
batch_id: BatchId,
downloaded_blocks: Vec<SignedBeaconBlock<T>>,
result: BatchProcessResult,
},
/// A parent lookup has failed for a block given by this `peer_id`.
ParentLookupFailed(PeerId),
}
/// Maintains a sequential list of parents to lookup and the lookup's current state.
@ -172,6 +176,9 @@ pub struct SyncManager<T: BeaconChainTypes> {
/// The logger for the import manager.
log: Logger,
/// The sending part of input_channel
sync_send: mpsc::UnboundedSender<SyncMessage<T::EthSpec>>,
}
/// Spawns a new `SyncManager` thread which has a weak reference to underlying beacon
@ -202,6 +209,7 @@ pub fn spawn<T: BeaconChainTypes>(
single_block_lookups: FnvHashMap::default(),
full_peers: HashSet::new(),
log: log.clone(),
sync_send: sync_send.clone(),
};
// spawn the sync manager thread
@ -590,8 +598,6 @@ impl<T: BeaconChainTypes> SyncManager<T> {
// If the last block in the queue has an unknown parent, we continue the parent
// lookup-search.
let total_blocks_to_process = parent_request.downloaded_blocks.len();
if let Some(chain) = self.chain.upgrade() {
let newest_block = parent_request
.downloaded_blocks
@ -606,7 +612,15 @@ impl<T: BeaconChainTypes> SyncManager<T> {
return;
}
Ok(BlockProcessingOutcome::Processed { .. })
| Ok(BlockProcessingOutcome::BlockIsAlreadyKnown { .. }) => {}
| Ok(BlockProcessingOutcome::BlockIsAlreadyKnown { .. }) => {
spawn_block_processor(
self.chain.clone(),
ProcessId::ParentLookup(parent_request.last_submitted_peer.clone()),
parent_request.downloaded_blocks,
self.sync_send.clone(),
self.log.clone(),
);
}
Ok(outcome) => {
// all else we consider the chain a failure and downvote the peer that sent
// us the last block
@ -634,64 +648,6 @@ impl<T: BeaconChainTypes> SyncManager<T> {
// chain doesn't exist, drop the parent queue and return
return;
}
//TODO: Shift this to a block processing thread
// the last received block has been successfully processed, process all other blocks in the
// chain
while let Some(block) = parent_request.downloaded_blocks.pop() {
// check if the chain exists
if let Some(chain) = self.chain.upgrade() {
match chain.process_block(block) {
Ok(BlockProcessingOutcome::Processed { .. })
| Ok(BlockProcessingOutcome::BlockIsAlreadyKnown { .. }) => {} // continue to the next block
// all else is considered a failure
Ok(outcome) => {
// the previous blocks have failed, notify the user the chain lookup has
// failed and drop the parent queue
debug!(
self.log, "Invalid parent chain. Past blocks failure";
"outcome" => format!("{:?}", outcome),
"peer" => format!("{:?}", parent_request.last_submitted_peer),
);
self.network
.downvote_peer(parent_request.last_submitted_peer.clone());
break;
}
Err(e) => {
warn!(
self.log, "Parent chain processing error.";
"error" => format!("{:?}", e)
);
self.network
.downvote_peer(parent_request.last_submitted_peer.clone());
break;
}
}
} else {
// chain doesn't exist, end the processing
break;
}
}
// at least one block has been processed, run fork-choice
if let Some(chain) = self.chain.upgrade() {
match chain.fork_choice() {
Ok(()) => trace!(
self.log,
"Fork choice success";
"block_imports" => total_blocks_to_process - parent_request.downloaded_blocks.len(),
"location" => "parent request"
),
Err(e) => error!(
self.log,
"Fork choice failed";
"error" => format!("{:?}", e),
"location" => "parent request"
),
};
}
}
}
@ -782,17 +738,20 @@ impl<T: BeaconChainTypes> Future for SyncManager<T> {
self.inject_error(peer_id, request_id);
}
SyncMessage::BatchProcessed {
process_id,
batch,
batch_id,
downloaded_blocks,
result,
} => {
self.range_sync.handle_block_process_result(
&mut self.network,
process_id,
*batch,
batch_id,
downloaded_blocks,
result,
);
}
SyncMessage::ParentLookupFailed(peer_id) => {
self.network.downvote_peer(peer_id);
}
},
Ok(Async::NotReady) => break,
Ok(Async::Ready(None)) => {

1
beacon_node/network/src/sync/mod.rs
View File

@ -1,6 +1,7 @@
//! Syncing for lighthouse.
//!
//! Stores the various syncing methods for the beacon chain.
mod block_processor;
pub mod manager;
mod network_context;
mod range_sync;

60
beacon_node/network/src/sync/range_sync/chain.rs
View File

@ -1,5 +1,5 @@
use super::batch::{Batch, BatchId, PendingBatches};
use super::batch_processing::{spawn_batch_processor, BatchProcessResult};
use crate::sync::block_processor::{spawn_block_processor, BatchProcessResult, ProcessId};
use crate::sync::network_context::SyncNetworkContext;
use crate::sync::SyncMessage;
use beacon_chain::{BeaconChain, BeaconChainTypes};
@ -76,7 +76,7 @@ pub struct SyncingChain<T: BeaconChainTypes> {
/// A random id given to a batch process request. This is None if there is no ongoing batch
/// process.
current_processing_id: Option<u64>,
current_processing_batch: Option<Batch<T::EthSpec>>,
/// A send channel to the sync manager. This is given to the batch processor thread to report
/// back once batch processing has completed.
@ -120,7 +120,7 @@ impl<T: BeaconChainTypes> SyncingChain<T> {
to_be_downloaded_id: BatchId(1),
to_be_processed_id: BatchId(1),
state: ChainSyncingState::Stopped,
current_processing_id: None,
current_processing_batch: None,
sync_send,
chain,
log,
@ -167,15 +167,16 @@ impl<T: BeaconChainTypes> SyncingChain<T> {
// An entire batch of blocks has been received. This functions checks to see if it can be processed,
// remove any batches waiting to be verified and if this chain is syncing, request new
// blocks for the peer.
debug!(self.log, "Completed batch received"; "id"=> *batch.id, "blocks"=>batch.downloaded_blocks.len(), "awaiting_batches" => self.completed_batches.len());
debug!(self.log, "Completed batch received"; "id"=> *batch.id, "blocks" => &batch.downloaded_blocks.len(), "awaiting_batches" => self.completed_batches.len());
// verify the range of received blocks
// Note that the order of blocks is verified in block processing
if let Some(last_slot) = batch.downloaded_blocks.last().map(|b| b.slot()) {
// the batch is non-empty
if batch.start_slot > batch.downloaded_blocks[0].slot() || batch.end_slot < last_slot {
let first_slot = batch.downloaded_blocks[0].slot();
if batch.start_slot > first_slot || batch.end_slot < last_slot {
warn!(self.log, "BlocksByRange response returned out of range blocks";
"response_initial_slot" => batch.downloaded_blocks[0].slot(),
"response_initial_slot" => first_slot,
"requested_initial_slot" => batch.start_slot);
network.downvote_peer(batch.current_peer);
self.to_be_processed_id = batch.id; // reset the id back to here, when incrementing, it will check against completed batches
@ -218,7 +219,7 @@ impl<T: BeaconChainTypes> SyncingChain<T> {
}
// Only process one batch at a time
if self.current_processing_id.is_some() {
if self.current_processing_batch.is_some() {
return;
}
@ -238,14 +239,14 @@ impl<T: BeaconChainTypes> SyncingChain<T> {
}
/// Sends a batch to the batch processor.
fn process_batch(&mut self, batch: Batch<T::EthSpec>) {
// only spawn one instance at a time
let processing_id: u64 = rand::random();
self.current_processing_id = Some(processing_id);
spawn_batch_processor(
fn process_batch(&mut self, mut batch: Batch<T::EthSpec>) {
let downloaded_blocks = std::mem::replace(&mut batch.downloaded_blocks, Vec::new());
let batch_id = ProcessId::RangeBatchId(batch.id.clone());
self.current_processing_batch = Some(batch);
spawn_block_processor(
self.chain.clone(),
processing_id,
batch,
batch_id,
downloaded_blocks,
self.sync_send.clone(),
self.log.clone(),
);
@ -256,30 +257,41 @@ impl<T: BeaconChainTypes> SyncingChain<T> {
pub fn on_batch_process_result(
&mut self,
network: &mut SyncNetworkContext,
processing_id: u64,
batch: &mut Option<Batch<T::EthSpec>>,
batch_id: BatchId,
downloaded_blocks: &mut Option<Vec<SignedBeaconBlock<T::EthSpec>>>,
result: &BatchProcessResult,
) -> Option<ProcessingResult> {
if Some(processing_id) != self.current_processing_id {
// batch process doesn't belong to this chain
if let Some(current_batch) = &self.current_processing_batch {
if current_batch.id != batch_id {
// batch process does not belong to this chain
return None;
}
// Continue. This is our processing request
} else {
// not waiting on a processing result
return None;
}
// Consume the batch option
let batch = batch.take().or_else(|| {
// claim the result by consuming the option
let downloaded_blocks = downloaded_blocks.take().or_else(|| {
// if taken by another chain, we are no longer waiting on a result.
self.current_processing_batch = None;
crit!(self.log, "Processed batch taken by another chain");
None
})?;
// No longer waiting on a processing result
let mut batch = self.current_processing_batch.take().unwrap();
// These are the blocks of this batch
batch.downloaded_blocks = downloaded_blocks;
// double check batches are processed in order TODO: Remove for prod
if batch.id != self.to_be_processed_id {
crit!(self.log, "Batch processed out of order";
"processed_batch_id" => *batch.id,
"expected_id" => *self.to_be_processed_id);
"processed_batch_id" => *batch.id,
"expected_id" => *self.to_be_processed_id);
}
self.current_processing_id = None;
let res = match result {
BatchProcessResult::Success => {
*self.to_be_processed_id += 1;

3
beacon_node/network/src/sync/range_sync/mod.rs
View File

@ -2,11 +2,10 @@
//! peers.
mod batch;
mod batch_processing;
mod chain;
mod chain_collection;
mod range;
pub use batch::Batch;
pub use batch_processing::BatchProcessResult;
pub use batch::BatchId;
pub use range::RangeSync;

26
beacon_node/network/src/sync/range_sync/range.rs
View File

@ -41,8 +41,9 @@
use super::chain::ProcessingResult;
use super::chain_collection::{ChainCollection, SyncState};
use super::{Batch, BatchProcessResult};
use super::BatchId;
use crate::message_processor::PeerSyncInfo;
use crate::sync::block_processor::BatchProcessResult;
use crate::sync::manager::SyncMessage;
use crate::sync::network_context::SyncNetworkContext;
use beacon_chain::{BeaconChain, BeaconChainTypes};
@ -130,8 +131,8 @@ impl<T: BeaconChainTypes> RangeSync<T> {
},
None => {
return warn!(self.log,
"Beacon chain dropped. Peer not considered for sync";
"peer_id" => format!("{:?}", peer_id));
"Beacon chain dropped. Peer not considered for sync";
"peer_id" => format!("{:?}", peer_id));
}
};
@ -256,15 +257,15 @@ impl<T: BeaconChainTypes> RangeSync<T> {
pub fn handle_block_process_result(
&mut self,
network: &mut SyncNetworkContext,
processing_id: u64,
batch: Batch<T::EthSpec>,
batch_id: BatchId,
downloaded_blocks: Vec<SignedBeaconBlock<T::EthSpec>>,
result: BatchProcessResult,
) {
// build an option for passing the batch to each chain
let mut batch = Some(batch);
// build an option for passing the downloaded_blocks to each chain
let mut downloaded_blocks = Some(downloaded_blocks);
match self.chains.finalized_request(|chain| {
chain.on_batch_process_result(network, processing_id, &mut batch, &result)
chain.on_batch_process_result(network, batch_id, &mut downloaded_blocks, &result)
}) {
Some((index, ProcessingResult::RemoveChain)) => {
let chain = self.chains.remove_finalized_chain(index);
@ -293,7 +294,12 @@ impl<T: BeaconChainTypes> RangeSync<T> {
Some((_, ProcessingResult::KeepChain)) => {}
None => {
match self.chains.head_request(|chain| {
chain.on_batch_process_result(network, processing_id, &mut batch, &result)
chain.on_batch_process_result(
network,
batch_id,
&mut downloaded_blocks,
&result,
)
}) {
Some((index, ProcessingResult::RemoveChain)) => {
let chain = self.chains.remove_head_chain(index);
@ -308,7 +314,7 @@ impl<T: BeaconChainTypes> RangeSync<T> {
None => {
// This can happen if a chain gets purged due to being out of date whilst a
// batch process is in progress.
debug!(self.log, "No chains match the block processing id"; "id" => processing_id);
debug!(self.log, "No chains match the block processing id"; "id" => *batch_id);
}
}
}