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https://issues.apache.org/jira/browse/HBASE-16234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15393143#comment-15393143
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Yi Liang commented on HBASE-16234:
----------------------------------
replicaRegionsNotRecordedInMeta is used in 3 class:
1.AssignmentManager(used when master start and assign all user regions)
2.EnableTableProcedure(used when master try to enable tables)
3.EnableTableHandler(used when master try to recover tables that are not fully
moved to ENABLE state)
my idea is that if one table descriptor is null, we just skip this table and
give some warning about which table is corrupted, so that user can use hbck to
restore it, then we can enable or recover this table after restoring it.
And the patch is for master(2.0.0) branch
> 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
> Attachments: HBASE-16234-V1.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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