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https://issues.apache.org/jira/browse/HBASE-8940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13708200#comment-13708200
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chunhui shen commented on HBASE-8940:
-------------------------------------
Here taking a retry should be accepted since HBASE-8941 has been fixed through
improving the test case.
> TestRegionMergeTransactionOnCluster#testWholesomeMerge may fail due to race
> in opening region
> ---------------------------------------------------------------------------------------------
>
> Key: HBASE-8940
> URL: https://issues.apache.org/jira/browse/HBASE-8940
> Project: HBase
> Issue Type: Bug
> Reporter: Ted Yu
> Assignee: Ted Yu
> Attachments: 8940-v1.txt
>
>
> From
> http://54.241.6.143/job/HBase-TRUNK-Hadoop-2/org.apache.hbase$hbase-server/395/testReport/org.apache.hadoop.hbase.regionserver/TestRegionMergeTransactionOnCluster/testWholesomeMerge/
> :
> {code}
> 013-07-11 09:33:44,154 INFO [AM.ZK.Worker-pool-2-thread-2]
> master.RegionStates(309): Offlined 3ffefd878a234031675de6b2c70b2ead from
> ip-10-174-118-204.us-west-1.compute.internal,60498,1373535184820
> 2013-07-11 09:33:44,154 INFO [AM.ZK.Worker-pool-2-thread-2]
> master.AssignmentManager$4(1223): The master has opened
> testWholesomeMerge,testRow0020,1373535210125.3ffefd878a234031675de6b2c70b2ead.
> that was online on
> ip-10-174-118-204.us-west-1.compute.internal,59210,1373535184884
> 2013-07-11 09:33:44,182 DEBUG [RS_OPEN_REGION-ip-10-174-118-204:59210-1]
> zookeeper.ZKAssign(862): regionserver:59210-0x13fcd13a20c0002 Successfully
> transitioned node 3ffefd878a234031675de6b2c70b2ead from RS_ZK_REGION_OPENING
> to RS_ZK_REGION_OPENED
> 2013-07-11 09:33:44,182 INFO
> [MASTER_TABLE_OPERATIONS-ip-10-174-118-204:39405-0]
> handler.DispatchMergingRegionHandler(154): Failed send MERGE REGIONS RPC to
> server ip-10-174-118-204.us-west-1.compute.internal,59210,1373535184884 for
> region
> testWholesomeMerge,,1373535210124.efcb10dcfa250e31bfd50dc6c7049f32.,testWholesomeMerge,testRow0020,1373535210125.3ffefd878a234031675de6b2c70b2ead.,
> focible=false, org.apache.hadoop.hbase.exceptions.RegionOpeningException:
> Region is being opened: 3ffefd878a234031675de6b2c70b2ead
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.getRegionByEncodedName(HRegionServer.java:2566)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionServer.java:3862)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.mergeRegions(HRegionServer.java:3649)
> at
> org.apache.hadoop.hbase.protobuf.generated.AdminProtos$AdminService$2.callBlockingMethod(AdminProtos.java:14400)
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2124)
> at
> org.apache.hadoop.hbase.ipc.RpcServer$Handler.run(RpcServer.java:1831)
> 2013-07-11 09:33:44,182 DEBUG [RS_OPEN_REGION-ip-10-174-118-204:59210-1]
> handler.OpenRegionHandler(373): region transitioned to opened in zookeeper:
> {ENCODED => 3ffefd878a234031675de6b2c70b2ead, NAME =>
> 'testWholesomeMerge,testRow0020,1373535210125.3ffefd878a234031675de6b2c70b2ead.',
> STARTKEY => 'testRow0020', ENDKEY => 'testRow0040'}, server:
> ip-10-174-118-204.us-west-1.compute.internal,59210,1373535184884
> 2013-07-11 09:33:44,183 DEBUG [RS_OPEN_REGION-ip-10-174-118-204:59210-1]
> handler.OpenRegionHandler(186): Opened
> testWholesomeMerge,testRow0020,1373535210125.3ffefd878a234031675de6b2c70b2ead.
> on server:ip-10-174-118-204.us-west-1.compute.internal,59210,1373535184884
> {code}
> We can see that MASTER_TABLE_OPERATIONS thread couldn't get region
> 3ffefd878a234031675de6b2c70b2ead because RS_OPEN_REGION thread finished
> region opening 1 millisecond later.
> One solution is to retry operation when receiving RegionOpeningException
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