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compaction: add a new option 'check_range_overlap_on_bottom_level' for manual compact #421

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Merged
ti-chi-bot merged 7 commits into from
Nov 18, 2025
Merged

compaction: add a new option 'check_range_overlap_on_bottom_level' for manual compact #421

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1b0c172
add a new option 'bottom_level_check_range_overlap' for manual compact
glorv Aug 19, 2025
424ac4f
add a comment
glorv Nov 17, 2025
209d988
Merge branch '8.10.tikv' into manual-compact-bottom-check
glorv Nov 17, 2025
94c0908
Merge branch '8.10.tikv' into manual-compact-bottom-check
glorv Nov 18, 2025
4bc323c
rename the new config name
glorv Nov 18, 2025
30a4f92
Merge branch 'manual-compact-bottom-check' of ssh://github.com/glorv/…
glorv Nov 18, 2025
c24fc99
rename
glorv Nov 18, 2025
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9 changes: 8 additions & 1 deletion db/db_impl/db_impl_compaction_flush.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -1234,7 +1234,14 @@ Status DBImpl::CompactRangeInternal(const CompactRangeOptions& options,
check_overlap_within_file = false;
}
}
if (!check_overlap_within_file) {
// `check_range_overlap_on_bottom_level` set to true means we check SST
// range overlap instead of real kv overlap to ensure that Manual
// Compact can be trigger on the overlapped SST files, so the SST files
// with big range can be split by the CompactionPartitioner.
if (!check_overlap_within_file ||
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@v01dstar v01dstar Aug 19, 2025

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Why !check_overlap_within_file is not sufficient?

rocksdb/db/db_impl/db_impl_compaction_flush.cc

Lines 1225 to 1227 in 2b04d05

if (!partitioner->CanDoTrivialMove(*begin, *end)) {
check_overlap_within_file = false;
}

Seems that if there are partitioner boundaries within the target range, it will trigger a compaction, not trivial move (by setting overlap to the current level)

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@glorv glorv Aug 20, 2025

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Yes, you are right, it's better to just change the CanDoTrivialMove implement in the SSTPartitioner. No need to add a new option.

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@hbisheng hbisheng Aug 20, 2025

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But it seems CanDoTrivialMove can't tell whether we are at the bottommost level? It only sees the key range

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@glorv glorv Aug 20, 2025

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Yes, but I think we should force partition/manual compact the overlapped SST files in all the level, not only the bottom level. This approach should gain better compatibility. So reuse CanDoTrivialMove is enough here.

(!overlap && options.check_range_overlap_on_bottom_level &&
level ==
current_version->storage_info()->num_non_empty_levels() - 1)) {
overlap = current_version->storage_info()->OverlapInLevel(level,
begin, end);
}
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10 changes: 10 additions & 0 deletions db/external_sst_file_ingestion_job.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -925,6 +925,9 @@ Status ExternalSstFileIngestionJob::AssignLevelAndSeqnoForIngestedFile(
// the keys that we overlap with in this level, We also need to assign
// this file a seqno to overwrite the existing keys in level `lvl`
overlap_with_db = true;
ROCKS_LOG_INFO(db_options_.info_log,
"Ingest file overlap with level %d, file: %s", lvl,
file_to_ingest->internal_file_path.c_str());
break;
}

Expand Down Expand Up @@ -1110,13 +1113,20 @@ bool ExternalSstFileIngestionJob::IngestedFileFitInLevel(
&file_largest_user_key)) {
// File overlap with another files in this level, we cannot
// add it to this level
ROCKS_LOG_INFO(
db_options_.info_log,
"Ingest file overlap with level file range, level %d, ingset_file: %s",
level, file_to_ingest->internal_file_path.c_str());
return false;
}

if (cfd_->RangeOverlapWithCompaction(file_smallest_user_key,
file_largest_user_key, level)) {
// File overlap with a running compaction output that will be stored
// in this level, we cannot add this file to this level
ROCKS_LOG_INFO(db_options_.info_log,
"Ingest file overlap with compaction in level %d, file: %s",
level, file_to_ingest->internal_file_path.c_str());
return false;
}

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5 changes: 5 additions & 0 deletions include/rocksdb/options.h
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Expand Up @@ -2020,6 +2020,11 @@ struct CompactRangeOptions {
// user-provided setting. This enables customers to selectively override the
// age cutoff.
double blob_garbage_collection_age_cutoff = -1;

// If set to true, it will check file range overlap instead of keys overlap
// for the bottom level. This is used in manual compact for SST ingestion
// scenario.
bool check_range_overlap_on_bottom_level = false;
};

// IngestExternalFileOptions is used by IngestExternalFile()
Expand Down