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From Paul Loy <ketera...@gmail.com>
Subject Re: Garbage collection freezes cassandra node
Date Mon, 19 Dec 2011 16:32:47 GMT
Giving it more memory will simply increase the time between (and duration
of) the freezes. Which JVM are you using? I think that Java 7 has some nice
improvements to GC especially with large heaps.

On Mon, Dec 19, 2011 at 7:35 AM, Rene Kochen
<Rene.Kochen@emea.schange.com>wrote:

> I recently see the following garbage collect behavior in our performance
> tests (the attached chart shows the heap-size in MB):****
>
> ** **
>
> ****
>
> ** **
>
> During the garbage collections, Cassandra freezes for about ten seconds. I
> observe the following log entries:****
>
> ** **
>
> “GC for ConcurrentMarkSweep: 11597 ms for 1 collections, 1887933144 used;
> max is 8550678528”****
>
> ** **
>
> I use Windows Server 2008 and Cassandra 0.7.10 with min and max heap size
> set to 8 GB.****
>
> ** **
>
> What can I do to make Cassandra not freeze? Just allocate more memory?****
>
> ** **
>
> Thanks,****
>
>
> Rene****
>



-- 
---------------------------------------------
Paul Loy
paul@keteracel.com
http://uk.linkedin.com/in/paulloy

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