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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Created: (CASSANDRA-1181) kinder gentler compaction
Date Fri, 11 Jun 2010 00:19:15 GMT
kinder gentler compaction
-------------------------

                 Key: CASSANDRA-1181
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1181
             Project: Cassandra
          Issue Type: Task
            Reporter: Jonathan Ellis
            Assignee: Brandon Williams
             Fix For: 0.7


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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