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https://issues.apache.org/jira/browse/CASSANDRA-1181?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brandon Williams updated CASSANDRA-1181:
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Attachment: 1181-trunk.txt
Updated to make MIN_PRIORITY the default, and constrain values to be less than
or equal to NORM_PRIORITY. Setting it any higher is silly anyway.
> kinder gentler compaction
> -------------------------
>
> Key: CASSANDRA-1181
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1181
> Project: Cassandra
> Issue Type: Task
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Brandon Williams
> Fix For: 0.6.3
>
> Attachments: 1181-trunk.txt, 1181.txt, CompactionManager.java,
> stats.txt
>
>
> I suggested this in a ML thread but it seems that nobody actually tried it.
> I think it's worth following up on:
> You could try setting the compaction thread to a lower priority. You could
> add a thread priority to NamedThreadPool, and pass that up from
> CompactionExecutor constructor. According to
> http://www.javamex.com/tutorials/threads/priority_what.shtml you have to run
> as root and add a JVM option to get this to work.
> In particular, Brandon saw stress.py read latencies spike to 100ms during
> [anti]compaction on a 2 core machine. I'd like to see if this can mitigate
> that.
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