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ethdb/pebble: lower the compaction debt (#31988)

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This pull request reduces the threshold for triggering compaction at
level0, leading to less compaction debt. This change is helpful in the
case of heavy write-load, mitigating the case of heavy write stalls
caused by compaction.

closes https://github.com/ethereum/go-ethereum/issues/31830
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rjl493456442 2025-06-17 20:23:45 +08:00 committed by GitHub
parent 05e199408f
commit 71653cf0c2
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11
ethdb/pebble/pebble.go
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@ -280,6 +280,17 @@ func New(file string, cache int, handles int, namespace string, readonly bool) (
// By setting the WALBytesPerSync, the cached WAL writes will be periodically
// flushed at the background if the accumulated size exceeds this threshold.
WALBytesPerSync: 5 * ethdb.IdealBatchSize,
// L0CompactionThreshold specifies the number of L0 read-amplification
// necessary to trigger an L0 compaction. It essentially refers to the
// number of sub-levels at the L0. For each sub-level, it contains several
// L0 files which are non-overlapping with each other, typically produced
// by a single memory-table flush.
//
// The default value in Pebble is 4, which is a bit too large to have
// the compaction debt as around 10GB. By reducing it to 2, the compaction
// debt will be less than 1GB, but with more frequent compactions scheduled.
L0CompactionThreshold: 2,
}
// Disable seek compaction explicitly. Check https://github.com/ethereum/go-ethereum/pull/20130
// for more details.