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fix splitter condition to avoid split micro-chunks #10375

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merged 2 commits into from
Oct 14, 2024
Merged

fix splitter condition to avoid split micro-chunks #10375

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67edc94
fix splitter condition for avoid split micro-chunks
ivanmorozov333 Oct 14, 2024
b94f929
correction
ivanmorozov333 Oct 14, 2024
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2 changes: 2 additions & 0 deletions ydb/core/tx/columnshard/splitter/batch_slice.cpp
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Expand Up @@ -99,6 +99,8 @@ bool TGeneralSerializedSlice::GroupBlobsImpl(const NSplitter::TGroupFeatures& fe
chunksInProgress.PopFront(i);
hasNoSplitChanges = true;
} else {
// in this case chunksInProgress[i] size >= Max - Min for case nextPartSize >= features.GetSplitSettings().GetMaxBlobSize()
// in this case chunksInProgress[i] size >= Max - 2 * Min for case nextOtherSize < features.GetSplitSettings().GetMinBlobSize()
Y_ABORT_UNLESS((i64)chunksInProgress[i]->GetPackedSize() > features.GetSplitSettings().GetMinBlobSize() - partSize);
Y_ABORT_UNLESS(otherSize - (features.GetSplitSettings().GetMinBlobSize() - partSize) >= features.GetSplitSettings().GetMinBlobSize());

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4 changes: 3 additions & 1 deletion ydb/core/tx/columnshard/splitter/settings.h
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Expand Up @@ -14,8 +14,10 @@ namespace NKikimr::NOlap::NSplitter {

class TSplitSettings {
private:
// DefaultMaxBlobSize - 2 * DefaultMinBlobSize have to been enought to "guarantee" records count > 1 through blobs splitting
static const inline i64 DefaultMaxBlobSize = 8 * 1024 * 1024;
static const inline i64 DefaultMinBlobSize = 4 * 1024 * 1024;
static const inline i64 DefaultMinBlobSize = 3 * 1024 * 1024;

static const inline i64 DefaultMinRecordsCount = 10000;
static const inline i64 DefaultMaxPortionSize = 6 * DefaultMaxBlobSize;
YDB_ACCESSOR(i64, MaxBlobSize, DefaultMaxBlobSize);
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