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https://issues.apache.org/jira/browse/HBASE-7092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13490202#comment-13490202
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Jimmy Xiang commented on HBASE-7092:
------------------------------------

I do have a heap dump which is more than 4GB.  I am using 1.7_9.  I will try 
1.6 and see if I get the same issue so that I can find out it is really a jdk 
issue or a new code issue.
                
> RegionServer OOM with jdk 1.7 related to ConcurrentHashMap class loader
> -----------------------------------------------------------------------
>
>                 Key: HBASE-7092
>                 URL: https://issues.apache.org/jira/browse/HBASE-7092
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>             Fix For: 0.96.0
>
>
> One instance of "java.util.concurrent.ConcurrentHashMap" loaded by "<system 
> class loader>" occupies 3,972,154,848 (92.88%) bytes. The instance is 
> referenced by org.apache.hadoop.hbase.regionserver.HRegionServer @ 
> 0x7038d3798 , loaded by "sun.misc.Launcher$AppClassLoader @ 0x703994668". The 
> memory is accumulated in one instance of 
> "java.util.concurrent.ConcurrentHashMap$Segment[]" loaded by "<system class 
> loader>".
> Keywords
> sun.misc.Launcher$AppClassLoader @ 0x703994668
> java.util.concurrent.ConcurrentHashMap
> java.util.concurrent.ConcurrentHashMap$Segment[]

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