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From Chad Johnson <>
Subject Some commit logs not deleting
Date Mon, 25 Jul 2011 02:48:27 GMT

We are running Cassandra 0.7.5 on a 15 node cluster, RF=3. We are having a
problem where some commit logs do not get deleted. Our write load generates
a new commit log about every two to three minutes. On average, one commit
log an hour is not deleted. Without draining, deleting the remaining commit
log files and restarting each node in the cluster, the commit log partition
will fill up. We do one thing with our cluster that is probably not very
common. We make schema changes four times per day. We cycle column families
by dropping old column families for old data we don't care about any longer
and creating new ones for new data.

Is anybody else see this problem? I can assume that the dirty bit for those
commit logs are still set, but why? How can I determine what CF memtable is
still dirty?

Please let me know if there is additional information I can provide and
thanks for your help.


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