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https://issues.apache.org/jira/browse/HBASE-6041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13278276#comment-13278276
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Zhihong Yu commented on HBASE-6041:
-----------------------------------
Can you provide more context for the exception ?
This is the comment above calls to regionOnline():
{code}
// Add -ROOT- and .META. on regions map. They must be deployed if we got
// this far. Caller takes care of it.
{code}
Looks like in your case the above assumption was wrong.
> 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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