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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7092) RegionServer OOM with jdk 1.7 related to ConcurrentHashMap class loader
Date Sat, 03 Nov 2012 00:20:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13489866#comment-13489866
] 

Jimmy Xiang commented on HBASE-7092:
------------------------------------

Started a 4 nodes cluster with JDK1.7. Ran ycsb for a short time and all regionserver died
due to OOM.
                
> 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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