org.apache.paimon.mergetree.compact

Class ForceUpLevel0Compaction

java.lang.Object

org.apache.paimon.mergetree.compact.ForceUpLevel0Compaction

All Implemented Interfaces:

CompactStrategy

public class ForceUpLevel0Compaction
extends Object
implements CompactStrategy

A CompactStrategy to force compacting level 0 files.

Constructor Summary

Constructors

Constructor and Description
ForceUpLevel0Compaction(UniversalCompaction universal)

Method Summary

Modifier and Type	Method and Description
Optional<CompactUnit>	pick(int numLevels, List<LevelSortedRun> runs) Pick compaction unit from runs.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.paimon.mergetree.compact.CompactStrategy

pickFullCompaction

Constructor Detail

ForceUpLevel0Compaction

public ForceUpLevel0Compaction(UniversalCompaction universal)

Method Detail

pick

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

Description copied from interface: CompactStrategy

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.

Specified by:

pick in interface CompactStrategy