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ethdb/pebble: fix range compaction (#26771)

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* ethdb/pebble: fix range compaction

* ethdb/pebble: add comment
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rjl493456442 2023-02-28 21:32:51 +08:00 committed by GitHub
parent 2ea48f8a22
commit 98b0ea62b5
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1 changed files with 12 additions and 0 deletions
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12
ethdb/pebble/pebble.go
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@ -20,6 +20,7 @@
package pebble package pebble
import ( import (
"bytes"
"fmt" "fmt"
"runtime" "runtime"
"sync" "sync"
@ -361,6 +362,17 @@ func (d *Database) Stat(property string) (string, error) {
// is treated as a key after all keys in the data store. If both is nil then it // is treated as a key after all keys in the data store. If both is nil then it
// will compact entire data store. // will compact entire data store.
func (d *Database) Compact(start []byte, limit []byte) error { func (d *Database) Compact(start []byte, limit []byte) error {
// There is no special flag to represent the end of key range
// in pebble(nil in leveldb). Use an ugly hack to construct a
// large key to represent it.
// Note any prefixed database entry will be smaller than this
// flag, as for trie nodes we need the 32 byte 0xff because
// there might be a shared prefix starting with a number of
// 0xff-s, so 32 ensures than only a hash collision could touch it.
// https://github.com/cockroachdb/pebble/issues/2359#issuecomment-1443995833
if limit == nil {
limit = bytes.Repeat([]byte{0xff}, 32)
}
return d.db.Compact(start, limit, true) // Parallelization is preferred return d.db.Compact(start, limit, true) // Parallelization is preferred
} }