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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8940) TestRegionMergeTransactionOnCluster#testWholesomeMerge may fail due to race in opening region
Date Fri, 12 Jul 2013 21:51:49 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13707424#comment-13707424
] 

Hadoop QA commented on HBASE-8940:
----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12592068/8940-v1.txt
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:green}+1 hadoop1.0{color}.  The patch compiles against the hadoop 1.0 profile.

    {color:green}+1 hadoop2.0{color}.  The patch compiles against the hadoop 2.0 profile.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 lineLengths{color}.  The patch does not introduce lines longer than 100

  {color:green}+1 site{color}.  The mvn site goal succeeds with this patch.

    {color:green}+1 core tests{color}.  The patch passed unit tests in .

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/6315//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6315//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6315//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-client.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6315//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6315//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop1-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6315//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-prefix-tree.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6315//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6315//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6315//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/6315//console

This message is automatically generated.
                
> 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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