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https://issues.apache.org/jira/browse/HBASE-9738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16424461#comment-16424461
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stack commented on HBASE-9738:
------------------------------
Closed as FIXED but should have been closed as a DUPLICATE.
> Delete table and loadbalancer interference
> ------------------------------------------
>
> Key: HBASE-9738
> URL: https://issues.apache.org/jira/browse/HBASE-9738
> Project: HBase
> Issue Type: Bug
> Reporter: Devaraj Das
> Priority: Critical
> Fix For: 1.1.0
>
>
> I have noticed that when the balancer is computing a plan for region moves,
> and a delete table is issued, there is some interference.
> 1. At time t1, user deleted the table.
> 2. This led to the master updating the meta table to remove the line for the
> regioninfo for a region f2a9e2e9d70894c03f54ee5902bebee6.
> {noformat}
> 2013-10-04 08:42:52,495 INFO [MASTER_TABLE_OPERATIONS-hor15n05:60000-0]
> catalog.MetaEditor: Deleted [{ENCODED => f2a9e2e9d70894c03f54ee5902bebee6,
> NAME => 'usertable,,1380876170581.f2a9e2e9d70894c03f54ee5902bebee6.',
> STARTKEY => '', ENDKEY => ''}]
> {noformat}
> 3. However around the same time, the balancer kicked in, and reassigned the
> region and made it online somewhere. It didn't check the fact (nor anyone
> else did) that the table was indeed deleted.
> {noformat}
> 2013-10-04 08:42:53,215 INFO
> [hor15n05.gq1.ygridcore.net,60000,1380869262259-BalancerChore]
> master.HMaster: balance
> hri=usertable,,1380876170581.f2a9e2e9d70894c03f54ee5902bebee6.,
> src=hor15n09.gq1.ygridcore.net,60020,1380869263722,
> dest=hor15n11.gq1.ygridcore.net,60020,1380869263682
> {noformat}
> .....
> {noformat}
> 2013-10-04 08:42:53,592 INFO [AM.ZK.Worker-pool2-t829] master.RegionStates:
> Onlined f2a9e2e9d70894c03f54ee5902bebee6 on
> hor15n11.gq1.ygridcore.net,60020,1380869263682
> {noformat}
> 4. Henceforth, all the drop tables started giving warnings like
> {noformat}
> 2013-10-04 08:45:17,587 INFO [RpcServer.handler=8,port=60000]
> master.HMaster: Client=hrt_qa//68.142.246.151 delete usertable
> 2013-10-04 08:45:17,631 DEBUG [RpcServer.handler=8,port=60000]
> lock.ZKInterProcessLockBase: Acquired a lock for
> /hbase/table-lock/usertable/write-master:600000000000000
> 2013-10-04 08:45:17,637 WARN [RpcServer.handler=8,port=60000]
> catalog.MetaReader: No serialized HRegionInfo in
> keyvalues={usertable,,1380876170581.f2a9e2e9d70894c03f54ee5902bebee6./info:seqnumDuringOpen/1380876173509/Put/vlen=8/mvcc=0,
>
> usertable,,1380876170581.f2a9e2e9d70894c03f54ee5902bebee6./info:server/1380876173509/Put/vlen=32/mvcc=0,
>
> usertable,,1380876170581.f2a9e2e9d70894c03f54ee5902bebee6./info:serverstartcode/1380876173509/Put/vlen=8/mvcc=0}
> {noformat}
> 5. The create of the same table also fails since there is still state
> (reincarnated, maybe) about the table in the master.
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