[jira] [Commented] (HBASE-25717) RegionServer aborted due to ClassCastException

["Pankaj Kumar (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-25717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17317262#comment-17317262 ] 

Pankaj Kumar commented on HBASE-25717:
--------------------------------------

Thanks [~vjasani] for the review and merge... 

> RegionServer aborted due to ClassCastException
> ----------------------------------------------
>
>                 Key: HBASE-25717
>                 URL: https://issues.apache.org/jira/browse/HBASE-25717
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 2.2.6, 2.3.4, 2.4.2
>            Reporter: chiranjeevi
>            Assignee: Pankaj Kumar
>            Priority: Major
>             Fix For: 3.0.0-alpha-1, 2.1.10, 2.2.7, 2.5.0, 2.4.3, 2.3.6
>
>
> {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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