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From Daniel Josefsson <>
Subject Re: Running multiple compactions concurrently
Date Fri, 25 Feb 2011 14:53:13 GMT
The compaction will be part of a Cassandra upgrade (where all nodes will
have to be taken down), so no clients will be hitting it until the
upgrade is complete. I just want to minimize the downtime.

Thanks, this is basically what I wanted to hear.


On Fri, 2011-02-25 at 13:24 +0000, Gary Dusbabek wrote:

> If your cluster has the overall IO capacity to perform a simultaneous
> compaction on every node and still adequately service reads and
> writes, then yes.  If you're concerned about availability, your best
> bet will be to stagger the compactions.
> Gary.
> On Fri, Feb 25, 2011 at 04:24, Daniel Josefsson <> wrote:
> > We experienced the java.lang.NegativeArraySizeException when upgrading to
> > 0.7.2 in staging. The proposed solution (running compaction) seems to have
> > solved this. However it took a lot of time to run.
> >
> > Is it safe to invoke a major compaction on all of the machines concurrently?
> >
> > I can't see a reason why it wouldn't, but I want to be sure :)
> >
> > Thanks,
> > Daniel
> >
> >
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Daniel Josefsson

Software Engineer

Shazam Entertainment Ltd     
26-28 Hammersmith Grove, London W6 7HA

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