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From Mark Greene <>
Subject Re: Problems running Cassandra 0.6.1 on large EC2 instances.
Date Mon, 17 May 2010 22:51:01 GMT
Can you provide us with the current JVM args? Also, what type of work load
you are giving the ring (op/s)?

On Mon, May 17, 2010 at 6:39 PM, Curt Bererton <> wrote:

> Hello Cassandra users+experts,
> Hopefully someone will be able to point me in the correct direction. We
> have cassandra 0.6.1 working on our test servers and we *thought* everything
> was great and ready to move to production. We are currently running a ring
> of 4 large instance EC2 (
> servers on production with a replication factor of 3 and a QUORUM
> consistency level. We ran a test on 1% of our users, and everything was
> writing to and reading from cassandra great for the first 3 hours. After
> that point CPU usage spiked to 100% and stayed there, basically on all 4
> machines at once. This smells to me like a GC issue, and I'm looking into it
> with jconsole right now. If anyone can help me debug this and get cassandra
> all the way up and running without CPU spiking I would be forever in their
> debt.
> I suspect that anyone else running cassandra on large EC2 instances might
> just be able to tell me what JVM args they are successfully using in a
> production environment and if they upgraded to Cassandra 0.6.2 from 0.6.1,
> and did they go to batched writes due to bug 1014? (
> That might answer
> all my questions.
> Is there anyone on the list who is using large EC2 instances in production?
> Would you be kind enough to share your JVM arguments and any other tips?
> Thanks for any help,
> Curt
> --
> Curt, ZipZapPlay Inc.,,

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