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From Shuai Lin <linshuai2...@gmail.com>
Subject Re: Region Server OutOfMemory Error
Date Tue, 06 Jan 2015 11:34:03 GMT
Forgot to mention, we are using hbase 0.94.15.

On Tue, Jan 6, 2015 at 7:32 PM, Shuai Lin <linshuai2012@gmail.com> wrote:

> Hi all,
>
> We have a hbase cluster of 5 region servers, each, each hosting 60+
> regions.
>
> But under heavy load the region servers crashes for OOME now and then:
>
> #
> # java.lang.OutOfMemoryError: Java heap space
> # -XX:OnOutOfMemoryError="kill -9 %p"
> #   Executing /bin/sh -c "kill -9 16820"...
>
> We have max heap size set to 22GB (-Xmx22528m) for each RS, and uses the
> G1GC (-XX:+UseG1GC). To debug the problem we have turned on the jvm GC
> log.  The last few lines of the GC log before each crash are always like
> this:
>
> 2015-01-06T11:10:19.087+0000: 5035.720: [Full GC 7122M->5837M(21G),
> 0.8867660 secs]
>    [Eden: 1024.0K(7278.0M)->0.0B(8139.0M) Survivors: 68.0M->0.0B Heap:
> 7122.7M(22.0G)->5837.2M(22.0G)]
>  [Times: user=1.42 sys=0.00, real=0.89 secs]
> 2015-01-06T11:10:19.976+0000: 5036.608: [Full GC 5837M->5836M(21G),
> 0.6378260 secs]
>    [Eden: 0.0B(8139.0M)->0.0B(8139.0M) Survivors: 0.0B->0.0B Heap:
> 5837.2M(22.0G)->5836.5M(22.0G)]
>  [Times: user=0.93 sys=0.00, real=0.63 secs]
>
> From the last lineI see the heap only occupies 5837MB, and the capacity is
> 22GB, so how can the OOM happen? Or is my interpretation of the gc log
> wrong?
>
> I read some articles and onlhy got some basic concept of G1GC. I've tried
> tools like GCViewer, but none gives me useful explanation of the details of
> the GC log.
>
>
> Regards,
> Shuai
>
>
>

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