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ethdb/pebble: lower the compaction debt #31988

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ethdb/pebble: lower the compaction debt #31988

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11 changes: 11 additions & 0 deletions ethdb/pebble/pebble.go
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Original file line number Diff line number Diff line change
Expand Up @@ -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.
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