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From Shuai Lin <linshuai2...@gmail.com>
Subject Re: Region Server OutOfMemory Error
Date Fri, 09 Jan 2015 01:28:24 GMT
Hi Rendon,

Thanks for sharing! I'd like to know how much heap did you give to each RS
(before and after you fix the problem)? Does increasing the heap size works
well for you?

Regads,
Shuai

On Fri, Jan 9, 2015 at 1:36 AM, Rendon, Carlos (KBB - Irvine) <
Carlos.Rendon@kbb.com> wrote:

> I recently ran into this exact same issue on G1GC. In my case I had the
> luxury of giving HBase more heap space.
> If that is an option for you, you might try it out and see if it helps.
>
> -Carlos
>
> -----Original Message-----
> From: Shuai Lin [mailto:linshuai2012@gmail.com]
> Sent: Tuesday, January 06, 2015 3:33 AM
> To: user@hbase.apache.org
> Subject: Region Server OutOfMemory Error
>
> 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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