Ted Yu created HBASE-8940:
-----------------------------
Summary: 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
>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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