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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-14968) ConcurrentModificationException in region close resulting in the region staying in closing state
Date Sat, 12 Dec 2015 02:38:46 GMT
Enis Soztutar created HBASE-14968:
-------------------------------------

             Summary: ConcurrentModificationException in region close resulting in the region
staying in closing state
                 Key: HBASE-14968
                 URL: https://issues.apache.org/jira/browse/HBASE-14968
             Project: HBase
          Issue Type: Bug
            Reporter: Enis Soztutar
            Assignee: Enis Soztutar
             Fix For: 2.0.0, 1.2.0, 1.3.0


We have seen this in our tests. The region gets closed, but the region close handler gets
an unexpected exception causing the region to stay in closing state until RS is restarted.


The Phoenix and security coprocessors were loaded in that region. Here is the stack trace:

{code}
java.util.ConcurrentModificationException
	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
	at java.util.ArrayList$Itr.next(ArrayList.java:851)
	at org.apache.hadoop.hbase.coprocessor.CoprocessorHost$Environment.shutdown(CoprocessorHost.java:442)
	at org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost$RegionEnvironment.shutdown(RegionCoprocessorHost.java:155)
	at org.apache.hadoop.hbase.coprocessor.CoprocessorHost.shutdown(CoprocessorHost.java:272)
	at org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost$5.postEnvCall(RegionCoprocessorHost.java:496)
	at org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost.execOperation(RegionCoprocessorHost.java:1761)
	at org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost.postClose(RegionCoprocessorHost.java:489)
	at org.apache.hadoop.hbase.regionserver.HRegion.doClose(HRegion.java:1502)
	at org.apache.hadoop.hbase.regionserver.HRegion.close(HRegion.java:1349)
	at org.apache.hadoop.hbase.regionserver.handler.CloseRegionHandler.process(CloseRegionHandler.java:138)
	at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:128)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
{code}



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