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Jonathan Ellis commented on CASSANDRA-6142: ------------------------------------------- Pushed fixes for these to the same branch. (They are indeed existing bugs in LCR.) > 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). -- This message was sent by Atlassian JIRA (v6.1#6144)