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Jimmy Xiang commented on HBASE-7092: ------------------------------------ I got the same issue with jdk 1.6. So it is not a jdk issue. Uploaded the head-dump image shows it may related to onlineregions. > RegionServer OOM related to onlineregions > ----------------------------------------- > > Key: HBASE-7092 > URL: https://issues.apache.org/jira/browse/HBASE-7092 > Project: HBase > Issue Type: Bug > Reporter: Jimmy Xiang > Assignee: Jimmy Xiang > Fix For: 0.96.0 > > Attachments: heap-dump.png > > > 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[] -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira