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From Ian Soboroff <>
Subject Re: Continuously increasing RAM usage
Date Thu, 27 May 2010 10:23:23 GMT
A lot of folks have reported this issue, and there are a few JIRAs related
to it.  Post the output of nodetool tpstats.  Also, are there lots of GCs in
the system.log?  If so, are they something besides ParNew?


On Thu, May 27, 2010 at 2:32 AM, James Golick <> wrote:

> We're seeing RAM usage continually climb until eventually, cassandra
> becomes unresponsive.
> The JVM isn't OOM'ing. It has only committed 14/24GB of memory. So, I am
> assuming that the memory usage is related to mmap'd IO. Fair assumption?
> I tried setting the IO mode to standard, but it seemed to be a little
> slower and couldn't get the machine to come back online with adequate read
> performance, so I set it back. I'll have to write a solid cache warming
> script if I'm going to try that again.
> Any other ideas for what might be causing the issue? Is there something I
> should monitor or look at next time it happens?
> Thanks

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