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https://issues.apache.org/jira/browse/HBASE-22060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16795729#comment-16795729
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Duo Zhang commented on HBASE-22060:
-----------------------------------
[~zghaobac] I think we need to find a way to fix this before releasing 2.2.0?
This may require some protocol changes.
> postOpenDeployTasks could send OPENED region transition state to the wrong
> master
> ---------------------------------------------------------------------------------
>
> Key: HBASE-22060
> URL: https://issues.apache.org/jira/browse/HBASE-22060
> Project: HBase
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Bahram Chehrazy
> Assignee: stack
> Priority: Blocker
> Fix For: 3.0.0, 2.2.0, 2.3.0
>
>
> As was reported in HBASE-21788, we have repeatedly seen regions getting stuck
> in OPENING after master restarts. Here is one scenario that I've observed
> recently:
>
> 1) There is a region is transit (RIT).
> 2) The active master aborts and begins shutting down.
> 3) The backup master becomes active quickly, finds the RIT, creates
> OpenRegionProcedure and send request to some server.
> 4) The server quickly opens the region and posts OPENED state transition, but
> it uses its cached master instead of the new one.
> 5) The old active master which had not completely shutdown its assignment
> manager yet, notes the OPENED state report and ignores it. Because no
> corresponding procedure can be found.
> 6) The new master waits forever for a response to its OPEN region request.
>
> This happens more often with the meta region because it's small and takes a
> few seconds to open. Below are some related logs:
> *Previous HMaster:*
> 2019-03-14 13:19:16,310 ERROR [PEWorker-1] master.HMaster: ***** ABORTING
> master <master-1>,17000,1552438242232: Shutting down HBase cluster: file
> system not available *****
> 2019-03-14 13:19:16,310 INFO [PEWorker-1] regionserver.HRegionServer: *****
> STOPPING region server '<master-1>,17000,1552438242232' *****
> 2019-03-14 13:20:54,358 WARN
> [RpcServer.priority.FPBQ.Fifo.handler=11,queue=1,port=17000]
> assignment.AssignmentManager: No matching procedure found for rit=OPEN,
> location=*************,17020,1552561955412, table=hbase:meta,
> region=1588230740 transition to OPENED
> 2019-03-14 13:20:55,707 INFO [master/<master-1>:17000]
> assignment.AssignmentManager: Stopping assignment manager
> *New HMaster logs:*
> 2019-03-14 13:19:16,907 INFO [master/<master-2>:17000:becomeActiveMaster]
> master.ActiveMasterManager: Deleting ZNode for
> /HBaseServerZnodeCommonDir/**************/backup-masters/<master-2>,17000,1552438259871
> from backup master directory
> 2019-03-14 13:19:17,031 INFO [master/<master-2>:17000:becomeActiveMaster]
> master.ActiveMasterManager: Registered as active
> master=<master-2>,17000,1552438259871
> 2019-03-14 13:20:52,017 INFO [PEWorker-12] zookeeper.MetaTableLocator:
> Setting hbase:meta (replicaId=0) location in ZooKeeper as
> <server-1>,17020,1552536956826
> 2019-03-14 13:20:52,105 INFO [PEWorker-12] procedure2.ProcedureExecutor:
> Initialized subprocedures=[\{pid=178230, ppid=178229, state=RUNNABLE,
> hasLock=false; org.apache.hadoop.hbase.master.assignment.OpenRegionProcedure}]
>
> *HServer logs:*
> 2019-03-14 13:20:52,708 INFO [RS_CLOSE_META-regionserver/<server-1>:17020-0]
> handler.AssignRegionHandler: Open hbase:meta,,1.1588230740
> 2019-03-14 13:20:54,353 INFO [RS_CLOSE_META-regionserver/<server-1>:17020-0]
> regionserver.HRegion: Opened 1588230740; next sequenceid=229166
> 2019-03-14 13:20:54,356 INFO [RS_CLOSE_META-regionserver/<server-1>:17020-0]
> regionserver.HRegionServer: Post open deploy tasks for
> hbase:meta,,1.1588230740
> 2019-03-14 13:20:54,358 INFO [RS_CLOSE_META-regionserver/<server-1>:17020-0]
> handler.AssignRegionHandler: Opened hbase:meta,,1.1588230740
>
>
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