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From Michael Theroux <>
Subject Re: Compaction issues
Date Wed, 23 Oct 2013 14:10:05 GMT
One more note,

When we did this conversion, we were on Cassandra 1.1.X.  You didn't mention what version
of Cassandra you were running,


On Oct 23, 2013, at 10:05 AM, Michael Theroux wrote:

> When we made a similar move, for an unknown reason (I didn't hear any feedback from the
list when I asked why this might be), compaction didn't start after we moved from SizedTiered
to leveled compaction until I ran "nodetool compact <keyspace> <column-family-converted-to-lcs>".
> The thread is here:
> I've also seen other individuals on this list state that those pending compaction stats
didn't move unless the node was restarted.  Compaction started to run several minutes after
> Thanks,
> -Mike
> On Oct 23, 2013, at 9:14 AM, Russ Garrett wrote:
>> Hi,
>> We have a cluster which we've recently moved to use
>> LeveledCompactionStrategy. We were experiencing some disk space
>> issues, so we added two additional nodes temporarily to aid
>> compaction. Once the compaction had completed on all nodes, we
>> decommissioned the two temporary nodes.
>> All nodes now have a high number of pending tasks which isn't dropping
>> - they're remaining approximately static. There are constantly
>> compaction tasks running, but when they complete, the pending tasks
>> number doesn't drop. We've set the compaction rate limit to 0, and
>> increased the number of compactor threads until the I/O utilisation is
>> at maximum, but neither of these have helped.
>> Any suggestions?
>> Cheers,
>> -- 
>> Russ Garrett

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