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From Jonathan Ellis <>
Subject Re: Continuously increasing RAM usage
Date Thu, 27 May 2010 13:55:35 GMT
What else are you seeing that correlates with "unresponsive?"

lots of pending tasks in stage queues?

high cpu in a single thread?


(I sent a github pull request, but I've updated with a lot more
metrics to monitor.)

On Thu, May 27, 2010 at 12:32 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

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

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