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https://issues.apache.org/jira/browse/HBASE-13133?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14342576#comment-14342576
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Andrey Stepachev commented on HBASE-13133:
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not sure about root of the problem, but it seems can happen that async read
callback was set
in ZKSplitLogManagerCoordination#getDataSetWatch and called before
method SplitLogManagerCoordination#setDetails was called and details were set.
it seems that patch can be very straitforward, need to change order of
initialization.
but other possibility for that is not set coordination engine, in that case
details would not
be initialized, but chore still can be called.
> NPE when running TestSplitLogManager
> ------------------------------------
>
> Key: HBASE-13133
> URL: https://issues.apache.org/jira/browse/HBASE-13133
> Project: HBase
> Issue Type: Bug
> Reporter: zhangduo
>
> https://builds.apache.org/job/HBase-TRUNK/6187/testReport/junit/org.apache.hadoop.hbase.master/TestSplitLogManager/testOrphanTaskAcquisition/
> {noformat}
> 2015-03-01 01:34:58,902 INFO [Thread-23] master.TestSplitLogManager(298):
> TestOrphanTaskAcquisition
> 2015-03-01 01:34:58,904 DEBUG [Thread-23]
> coordination.ZKSplitLogManagerCoordination(870): Distributed log replay=true
> 2015-03-01 01:34:58,907 INFO [Thread-23]
> coordination.ZKSplitLogManagerCoordination(594): found orphan task
> orphan%2Ftest%2Fslash
> 2015-03-01 01:34:58,913 INFO [Thread-23]
> coordination.ZKSplitLogManagerCoordination(598): Found 1 orphan tasks and 0
> rescan nodes
> 2015-03-01 01:34:58,913 ERROR [main-EventThread]
> zookeeper.ClientCnxn$EventThread(613): Caught unexpected throwable
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.coordination.ZKSplitLogManagerCoordination.findOrCreateOrphanTask(ZKSplitLogManagerCoordination.java:546)
> at
> org.apache.hadoop.hbase.coordination.ZKSplitLogManagerCoordination.heartbeat(ZKSplitLogManagerCoordination.java:556)
> at
> org.apache.hadoop.hbase.coordination.ZKSplitLogManagerCoordination.getDataSetWatchSuccess(ZKSplitLogManagerCoordination.java:467)
> at
> org.apache.hadoop.hbase.coordination.ZKSplitLogManagerCoordination.access$700(ZKSplitLogManagerCoordination.java:74)
> at
> org.apache.hadoop.hbase.coordination.ZKSplitLogManagerCoordination$GetDataAsyncCallback.processResult(ZKSplitLogManagerCoordination.java:1020)
> at
> org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:561)
> at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:498)
> {noformat}
> I got this NPE almost every time when running TestSplitLogManager locally. I
> am not sure whether it is the root cause of test failing, but seems related.
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