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https://issues.apache.org/jira/browse/HBASE-15911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16364274#comment-16364274
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Pankaj Kumar commented on HBASE-15911:
--------------------------------------

Hi [~benlau], please feel free to take this Jira. I too fixed in our version 
but didn't find time to write test case.

> NPE in AssignmentManager.onRegionTransition after Master restart
> ----------------------------------------------------------------
>
>                 Key: HBASE-15911
>                 URL: https://issues.apache.org/jira/browse/HBASE-15911
>             Project: HBase
>          Issue Type: Bug
>          Components: master, Region Assignment
>    Affects Versions: 1.3.0
>            Reporter: Mikhail Antonov
>            Assignee: Mikhail Antonov
>            Priority: Major
>
> 16/05/27 17:49:18 ERROR ipc.RpcServer: Unexpected throwable object 
> java.lang.NullPointerException
>       at 
> org.apache.hadoop.hbase.master.AssignmentManager.onRegionTransition(AssignmentManager.java:4364)
>       at 
> org.apache.hadoop.hbase.master.MasterRpcServices.reportRegionStateTransition(MasterRpcServices.java:1421)
>       at 
> org.apache.hadoop.hbase.protobuf.generated.RegionServerStatusProtos$RegionServerStatusService$2.callBlockingMethod(RegionServerStatusProtos.java:8623)
>       at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2239)
>       at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:116)
>       at 
> org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:137)
>       at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:112)
>       at java.lang.Thread.run(Thread.java:745)
> I'm pretty sure I've seen it before and more than once, but never got to dig 
> in.



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