org.apache.paimon.mergetree.compact

Interface CompactStrategy

All Known Implementing Classes:

ForceUpLevel0Compaction, UniversalCompaction

public interface CompactStrategy

Compact strategy to decide which files to select for compaction.

Method Summary

Modifier and Type	Method and Description
Optional<CompactUnit>	pick(int numLevels, List<LevelSortedRun> runs) Pick compaction unit from runs.
static Optional<CompactUnit>	pickFullCompaction(int numLevels, List<LevelSortedRun> runs) Pick a compaction unit consisting of all existing files.

Method Detail

pick

Optional<CompactUnit> pick(int numLevels,
                           List<LevelSortedRun> runs)

Pick compaction unit from runs.

• compaction is runs-based, not file-based.
• level 0 is special, one run per file; all other levels are one run per level.
• compaction is sequential from small level to large level.

pickFullCompaction

static Optional<CompactUnit> pickFullCompaction(int numLevels,
                                                List<LevelSortedRun> runs)

Pick a compaction unit consisting of all existing files.