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https://issues.apache.org/jira/browse/HBASE-3627?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HBASE-3627:
-------------------------
Resolution: Fixed
Hadoop Flags: [Reviewed]
Status: Resolved (was: Patch Available)
Committed branch and trunk. Thanks for review J-D and Jon.
> NPE in EventHandler when region already reassigned
> --------------------------------------------------
>
> Key: HBASE-3627
> URL: https://issues.apache.org/jira/browse/HBASE-3627
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.90.1
> Reporter: Jean-Daniel Cryans
> Assignee: stack
> Priority: Critical
> Fix For: 0.90.2
>
> Attachments: 3627.txt
>
>
> When a region takes too long to open, it will try to update the unassigned
> znode and will fail on an ugly NPE like this:
> {quote}
> DEBUG org.apache.hadoop.hbase.zookeeper.ZKAssign:
> regionserver:60020-0x22dc571dde04ca7 Attempting to transition node
> 0519dc3b62a569347526875048c37faa from RS_ZK_REGION_OPENING to
> RS_ZK_REGION_OPENING
> DEBUG org.apache.hadoop.hbase.zookeeper.ZKUtil:
> regionserver:60020-0x22dc571dde04ca7 Unable to get data of znode
> /hbase/unassigned/0519dc3b62a569347526875048c37faa because node does not
> exist (not necessarily an error)
> ERROR org.apache.hadoop.hbase.executor.EventHandler: Caught throwable while
> processing event M_RS_OPEN_REGION
> java.lang.NullPointerException
> at org.apache.hadoop.hbase.util.Writables.getWritable(Writables.java:75)
> at
> org.apache.hadoop.hbase.executor.RegionTransitionData.fromBytes(RegionTransitionData.java:198)
> at
> org.apache.hadoop.hbase.zookeeper.ZKAssign.transitionNode(ZKAssign.java:672)
> at
> org.apache.hadoop.hbase.zookeeper.ZKAssign.retransitionNodeOpening(ZKAssign.java:585)
> at
> org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.tickleOpening(OpenRegionHandler.java:322)
> at
> org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.process(OpenRegionHandler.java:97)
> at
> org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:151)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> {quote}
> I think the region server in this case should be closing the region ASAP.
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