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From Mohit Anchlia <mohitanch...@gmail.com>
Subject Re: Garbage collection freezes cassandra node
Date Mon, 19 Dec 2011 16:39:04 GMT
Increasing memory in this case may not solve the problem. Share some
information about your workload. Cluster configuration, cache sizes etc.

You can also try getting java heap historgram to get more info on what's on
the heap.

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****
>

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