[CASSANDRA-17899] Allow reducing scope for L0 to L1 compactions when space is limited

• Type: Improvement
• Status: Resolved
• Priority: Normal
• Resolution: Duplicate
• Fix Version/s: 5.x
• Component/s: Local/Compaction/LCS
• Change Category: Operability
• Complexity: Normal
• Platform: All
• Assignee: Josh McKenzie
• Reporter: Josh McKenzie

Authors

Josh McKenzie

• Created: 14/Sep/22 19:12
• Updated: 07/Mar/23 10:53
• Resolved: 16/Sep/22 19:01

Description

When using LCS we currently only allow reducing scope when doing STCS-in-L0, reason being that removing an sstable from a compaction targeting higher level could cause overlap in the level.

It is safe to remove sstables from L0 when doing L0->L1 compactions though, and this can allow us to continue compacting when we have a few gigantic sstables in L0.

Issue Links

• duplicates: CASSANDRA-17272 LeveledCompactionStrategy disk space check improvements