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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2013/10/03 17:40:42 UTC

[jira] [Created] (CASSANDRA-6142) Remove multithreaded compaction

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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