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https://issues.apache.org/jira/browse/HBASE-19965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16357980#comment-16357980
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Guanghao Zhang commented on HBASE-19965:
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[~stack] [~Apache9] Any ideas about how to fix this?
> Fix flaky TestAsyncRegionAdminApi
> ---------------------------------
>
> Key: HBASE-19965
> URL: https://issues.apache.org/jira/browse/HBASE-19965
> Project: HBase
> Issue Type: Sub-task
> Reporter: Guanghao Zhang
> Priority: Major
>
> See
> [https://builds.apache.org/job/HBase%20Nightly/job/branch-2/284/testReport/junit/org.apache.hadoop.hbase.client/TestAsyncRegionAdminApi/testMergeRegions_0_/]
>
> java.lang.AssertionError: expected:<2> but was:<3> at
> org.apache.hadoop.hbase.client.TestAsyncRegionAdminApi.testMergeRegions(TestAsyncRegionAdminApi.java:359)
>
> Merge regions not work. The table still have 3 regions after the
> MergeRegionsProcedure finished.
> The master start balance region 9e2773ba1efba79a2defa276e9a26ed4. But because
> the MergeRegionsProcedure pid=138 start work first, so the balance need wait
> for the lock. But after merge regions finished, the MoveRegionProcedure
> pid=139 start work and assign 9e2773ba1efba79a2defa276e9a26ed4 to a new
> region server. This is not right. The MoveRegionProcedure should skip to
> assign a region which was marked as offline. Or we should clear the merged
> regions' procedure when MergeRegionsProcedure finished.
>
> Logs:
> 2018-02-08 16:24:44,608 INFO [master/cd4730e3eae2:0.Chore.1]
> master.HMaster(1454): balance
> hri=testMergeRegions,,1518107079782.9e2773ba1efba79a2defa276e9a26ed4.,
> source=cd4730e3eae2,39077,1518106776411,
> destination=cd4730e3eae2,40578,1518106776318
> 2018-02-08 16:24:44,608 DEBUG
> [RpcServer.default.FPBQ.Fifo.handler=4,queue=0,port=37885]
> procedure2.ProcedureExecutor(868): Stored pid=138,
> state=RUNNABLE:MERGE_TABLE_REGIONS_PREPARE; MergeTableRegionsProcedure
> table=testMergeRegions, regions=[9e2773ba1efba79a2defa276e9a26ed4,
> 8f8fd5cd032313e1aadb83e31e1b7479], forcibly=false
> ......
> 2018-02-08 16:24:50,111 INFO [PEWorker-13]
> procedure2.ProcedureExecutor(1249): Finished pid=138, state=SUCCESS;
> MergeTableRegionsProcedure table=testMergeRegions,
> regions=[9e2773ba1efba79a2defa276e9a26ed4, 8f8fd5cd032313e1aadb83e31e1b7479],
> forcibly=false in 5.5710sec
> 2018-02-08 16:24:50,113 INFO [PEWorker-13]
> procedure.MasterProcedureScheduler(813): pid=139,
> state=RUNNABLE:MOVE_REGION_UNASSIGN; MoveRegionProcedure
> hri=testMergeRegions,,1518107079782.9e2773ba1efba79a2defa276e9a26ed4.,
> source=cd4730e3eae2,39077,1518106776411,
> destination=cd4730e3eae2,40578,1518106776318 testMergeRegions
> testMergeRegions,,1518107079782.9e2773ba1efba79a2defa276e9a26ed4.
>
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