Josh McKenzie created CASSANDRA-16881:
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Summary: L0 compactions never recover when thousands unleveled
Key: CASSANDRA-16881
URL: https://issues.apache.org/jira/browse/CASSANDRA-16881
Project: Cassandra
Issue Type: Improvement
Components: Local/Compaction/STCS
Reporter: Josh McKenzie
Assignee: Josh McKenzie
While this is somewhat mitigated by incremental repair and CASSANDRA-14388, we
can still find ourselves in a scenario where we have thousands of small
sstables living in L0 on STCS and get into a heavily degraded state.
We should add a JMX flag to allow operators to flip the behaviour when doing
STCS in L0 from picking the ‘hottest’ bucket to picking the largest one - this
should allow us to get down to reasonable numbers of sstables in L0 quicker in
this pathological case. If this proves to work particularly well we could
consider making this the default in a future version.
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