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https://issues.apache.org/jira/browse/CASSANDRA-2558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13028648#comment-13028648
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Sylvain Lebresne commented on CASSANDRA-2558:
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bq. You still have a "compacters" in the sample config file.
Fixed (in current 0.8 branch and trunk).
bq. I also see that when I set compactors to 6, I get 7 tmp files.
Are you sure one the tmp file is not the current memtable being flushed ?
Because I really don't see where there could be an offset problem.
Thanks for the testing.
> Add "concurrent_compactions" configuration
> ------------------------------------------
>
> Key: CASSANDRA-2558
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2558
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Affects Versions: 0.8 beta 1
> Reporter: Sylvain Lebresne
> Assignee: Sylvain Lebresne
> Priority: Trivial
> Fix For: 0.8.0 beta 2
>
> Attachments:
> 0001-Make-compaction-thread-number-configurable-v2.patch,
> 0001-Make-compaction-thread-number-configurable.patch
>
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> We should expose a way to configure the max number of thread to use when
> multi_threaded compaction is turned on. So far, it uses nb_of_processors
> thread, which if you have many cores may be unreasonably high (as far as
> random IO is concerned and thus independently of compaction throttling)... at
> least unless you have SSD.
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