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https://issues.apache.org/jira/browse/HBASE-6041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13278285#comment-13278285
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Jimmy Xiang commented on HBASE-6041:
------------------------------------
The assumption is not true all the time. This is rare. It happened to us
once. We could not start the hbase and found this in the master log.
I checked 92 and trunk code. It doesn't have similar code any more.
> NullPointerException prevents the master from starting up
> ---------------------------------------------------------
>
> Key: HBASE-6041
> URL: https://issues.apache.org/jira/browse/HBASE-6041
> Project: HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 0.90.6
> Reporter: Jimmy Xiang
> Assignee: Jimmy Xiang
> Fix For: 0.90.7
>
> Attachments: hbase-6041.patch
>
>
> This is 0.90 only.
> 2012-05-04 14:27:57,913 FATAL org.apache.hadoop.hbase.master.HMaster:
> Unhandled exception. Starting shutdown.
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.master.AssignmentManager.regionOnline(AssignmentManager.java:731)
> at
> org.apache.hadoop.hbase.master.AssignmentManager.processFailover(AssignmentManager.java:215)
> at
> org.apache.hadoop.hbase.master.HMaster.finishInitialization(HMaster.java:419)
> at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:293)
> 2012-05-04 14:27:57,914 INFO org.apache.hadoop.hbase.master.HMaster: Aborting
> 2012-05-04 14:27:57,915 INFO org.apache.hadoop.ipc.HBaseServer: Stopping
> server on 1433
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