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https://issues.apache.org/jira/browse/HBASE-25717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17311315#comment-17311315
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Pankaj Kumar commented on HBASE-25717:
--------------------------------------
Will raise a PR soon.
> RegionServer aborted with due to ClassCastException
> ---------------------------------------------------
>
> Key: HBASE-25717
> URL: https://issues.apache.org/jira/browse/HBASE-25717
> Project: HBase
> Issue Type: Bug
> Reporter: chiranjeevi
> Assignee: Pankaj Kumar
> Priority: Major
>
> {color:#000000}Observed RegionServer crash while writing huge data
> concurrently through YCSB tool,
> {noformat}
> 2021-03-29 14:35:37,860 | ERROR |
> RpcServer.priority.RWQ.Fifo.write.handler=19,queue=3,port=RS_PORT | *****
> ABORTING region server RS_IP,RS_PORT,1616999325078: The coprocessor
> org.apache.hadoop.hbase.coprocessor.MetaTableMetrics threw
> java.lang.ClassCastException: java.util.HashMap$Node cannot be cast to
> java.util.HashMap$TreeNode ***** |
> org.slf4j.helpers.MarkerIgnoringBase.error(MarkerIgnoringBase.java:159)
> java.lang.ClassCastException: java.util.HashMap$Node cannot be cast to
> java.util.HashMap$TreeNode
> at java.util.HashMap$TreeNode.moveRootToFront(HashMap.java:1835)
> at java.util.HashMap$TreeNode.treeify(HashMap.java:1951)
> at java.util.HashMap.treeifyBin(HashMap.java:772)
> at java.util.HashMap.putVal(HashMap.java:644)
> at java.util.HashMap.put(HashMap.java:612)
> at java.util.HashSet.add(HashSet.java:220)
> at
> org.apache.hadoop.hbase.coprocessor.MetaTableMetrics$ExampleRegionObserverMeta.registerAndMarkMeter(MetaTableMetrics.java:200)
> at
> org.apache.hadoop.hbase.coprocessor.MetaTableMetrics$ExampleRegionObserverMeta.regionMetricRegisterAndMark(MetaTableMetrics.java:173)
> at
> org.apache.hadoop.hbase.coprocessor.MetaTableMetrics$ExampleRegionObserverMeta.registerAndMarkMetrics(MetaTableMetrics.java:106)
> at
> org.apache.hadoop.hbase.coprocessor.MetaTableMetrics$ExampleRegionObserverMeta.prePut(MetaTableMetrics.java:91)
> at
> org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost$23.call(RegionCoprocessorHost.java:948)
> at
> org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost$23.call(RegionCoprocessorHost.java:945)
> at
> org.apache.hadoop.hbase.coprocessor.CoprocessorHost$ObserverOperationWithoutResult.callObserver(CoprocessorHost.java:581)
> at
> org.apache.hadoop.hbase.coprocessor.CoprocessorHost.execOperation(CoprocessorHost.java:655)
> at
> org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost.prePut(RegionCoprocessorHost.java:945)
> {noformat}
> This problem occured only once in my test cluster. Discussed offline with
> [~pankajkumar] it looks like race condition in
> MetaTableMetrics.metrics.{color}
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