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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3627) NPE in EventHandler when region already reassigned
Date Sat, 12 Mar 2011 00:14:59 GMT
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
            Priority: Critical
             Fix For: 0.90.2


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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