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https://issues.apache.org/jira/browse/HBASE-16874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15586789#comment-15586789
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Ted Yu commented on HBASE-16874:
--------------------------------

Which test covers multi-executor thread case ?

> Potential NPE from ProcedureExecutor#stop()
> -------------------------------------------
>
>                 Key: HBASE-16874
>                 URL: https://issues.apache.org/jira/browse/HBASE-16874
>             Project: HBase
>          Issue Type: Bug
>          Components: proc-v2
>            Reporter: Ted Yu
>            Assignee: Matteo Bertozzi
>            Priority: Minor
>             Fix For: 2.0.0
>
>         Attachments: 16874.v1.txt, HBASE-16874-v0.patch
>
>
> When examining failed test :
> https://builds.apache.org/job/HBase-TRUNK_matrix/lastCompletedBuild/jdk=JDK%201.8%20(latest),label=yahoo-not-h2/testReport/org.apache.hadoop.hbase.master.procedure/TestMasterFailoverWithProcedures/org_apache_hadoop_hbase_master_procedure_TestMasterFailoverWithProcedures/
> I noticed the following:
> {code}
> 2016-10-18 18:47:39,313 INFO  [Time-limited test] 
> procedure.TestMasterFailoverWithProcedures(306): Restart 2 exec state: 
> TRUNCATE_TABLE_CLEAR_FS_LAYOUT
> Exception in thread "ProcedureExecutorWorker-1" java.lang.NullPointerException
>       at 
> org.apache.hadoop.hbase.procedure2.ProcedureExecutor.stop(ProcedureExecutor.java:533)
>       at 
> org.apache.hadoop.hbase.procedure2.ProcedureExecutor.execProcedure(ProcedureExecutor.java:1197)
>       at 
> org.apache.hadoop.hbase.procedure2.ProcedureExecutor.executeProcedure(ProcedureExecutor.java:959)
>       at 
> org.apache.hadoop.hbase.procedure2.ProcedureExecutor.access$700(ProcedureExecutor.java:73)
>       at 
> org.apache.hadoop.hbase.procedure2.ProcedureExecutor$WorkerThread.run(ProcedureExecutor.java:1405)
> {code}
> This seems to be the result of race between stop() and join() methods.



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