Jonathan Ellis created CASSANDRA-6142:
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Summary: Remove multithreaded compaction
Key: CASSANDRA-6142
URL: https://issues.apache.org/jira/browse/CASSANDRA-6142
Project: Cassandra
Issue Type: Bug
Components: Core
Reporter: Jonathan Ellis
Assignee: Jonathan Ellis
Priority: Minor
Fix For: 2.1
There is at best a very small sweet spot for multithreaded compaction
(ParallelCompactionIterable). For large rows, we stall the pipeline and fall
back to a single LCR pass. For small rows, the overhead of the coordination
outweighs the benefits of parallelization (45s to compact 2x1M stress rows with
multithreading enabled, vs 35 with it disabled).
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