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https://issues.apache.org/jira/browse/HBASE-16234?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yi Liang updated HBASE-16234:
-----------------------------
Attachment: HBASE-16234-V5.patch
> Expect and handle nulls when assigning replicas
> -----------------------------------------------
>
> Key: HBASE-16234
> URL: https://issues.apache.org/jira/browse/HBASE-16234
> Project: HBase
> Issue Type: Bug
> Components: Region Assignment
> Affects Versions: 2.0.0
> Reporter: Harsh J
> Assignee: Yi Liang
> Attachments: HBASE-16234-V1.patch, HBASE-16234-V2.patch,
> HBASE-16234-V3.patch, HBASE-16234-V4.patch, HBASE-16234-V5.patch
>
>
> Observed this on a cluster:
> {code}
> FATAL org.apache.hadoop.hbase.master.HMaster: Unhandled exception. Starting
> shutdown.
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.master.AssignmentManager.replicaRegionsNotRecordedInMeta(AssignmentManager.java:2799)
>
> at
> org.apache.hadoop.hbase.master.AssignmentManager.assignAllUserRegions(AssignmentManager.java:2778)
>
> at
> org.apache.hadoop.hbase.master.AssignmentManager.processDeadServersAndRegionsInTransition(AssignmentManager.java:638)
>
> at
> org.apache.hadoop.hbase.master.AssignmentManager.joinCluster(AssignmentManager.java:485)
>
> at
> org.apache.hadoop.hbase.master.HMaster.finishActiveMasterInitialization(HMaster.java:723)
>
> at org.apache.hadoop.hbase.master.HMaster.access$500(HMaster.java:169)
> at org.apache.hadoop.hbase.master.HMaster$1.run(HMaster.java:1481)
> at java.lang.Thread.run(Thread.java:745)
> {code}
> It looks like {{FSTableDescriptors#get(…)}} can be expected to return null in
> some cases, but {{AssignmentManager.replicaRegionsNotRecordedInMeta(…)}} does
> not currently have any handling for such a possibility.
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