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https://issues.apache.org/jira/browse/CASSANDRA-6142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13809198#comment-13809198
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Jonathan Ellis commented on CASSANDRA-6142:
-------------------------------------------
The 2.0 backport was bad enough, I don't even want to think about 1.2. They're
all pretty rare corner cases, so I'm fine with telling people to upgrade to 2.0
if they care.
> 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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