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From Shuai Lin <linshuai2...@gmail.com>
Subject Region Server OutOfMemory Error
Date Tue, 06 Jan 2015 11:32:44 GMT
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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