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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: Persistently increasing read latency
Date Wed, 02 Dec 2009 02:18:02 GMT
On Tue, Dec 1, 2009 at 7:31 PM, Freeman, Tim <tim.freeman@hp.com> wrote:
> Looking at the Cassandra mbean's, the attributes of ROW-MUTATION-STAGE and ROW-READ-STAGE
and RESPONSE-STAGE are all  less than 10.  MINOR-COMPACTION-POOL reports 1218 pending tasks.

That's probably the culprit right there.  Something is wrong if you
have 1200 pending compactions.

This is something that upgrading to trunk will help with right away
since we parallelize compactions there.

Another thing you can do is increase the memtable limits so you are
not flushing + compacting so often with your insert traffic.

-Jonathan

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