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From Jonathan Ellis <>
Subject Re: Manual Compaction in Production
Date Mon, 08 Nov 2010 23:16:01 GMT
After Sylvain added support for removing tombstones during minor
compactions in 0.6.6 (see, doing major
compactions should be considered unnecessary until otherwise
demonstrated for your workload.  (If you happen to have weekly slow
periods into which major compaction fits conveniently, then great, it
won't hurt things, but otherwise, leave it off.)

On Mon, Nov 8, 2010 at 4:07 PM, Wayne <> wrote:
> Can anyone speak to best practices for running manual compaction in
> production? Our assumption is that without it the sstables will become too
> this an accepted "fact"? Obviously it depends on the volume
> of writes, but I am looking for current production practices.
> Since it takes a lot of resources and 4-5 hours for our current node size of
> 500Gb weekly seems like a sensible option for us. Is this a normal practice?
> Is it best to run on all nodes at the same time or staggered across nodes to
> reduce total cluster slow-down? Given that full compaction has a major
> affect on a node and its ability to function under heavy load our assumption
> is that staggered over the weekend for example (our low usage time) would be
> best.
> Any recommendations?
> Thanks
> Wayne

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support

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