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https://issues.apache.org/jira/browse/HBASE-1104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12660177#action_12660177
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stack commented on HBASE-1104:
------------------------------
We set region as 'closed' when master sends over the CLOSE message to the
regionserver. My adding the clearing of the 'closing' when state goes to
'close' unearthed this 'hole' (least seems like a hole that region could be
'closing' and 'closed' at same time). I think state should be set to 'closing'
when master sends message out to regionserver and then on receipt of the close
confirmation, then it should move region to 'closed' and 'unassigned'.
> Doubly-assigned regions redux
> -----------------------------
>
> Key: HBASE-1104
> URL: https://issues.apache.org/jira/browse/HBASE-1104
> Project: Hadoop HBase
> Issue Type: Bug
> Environment: pset cluster with TRUNK.
> Reporter: stack
> Fix For: 0.19.0
>
>
> Testing, I see doubly assigned regions. Below is from master log for
> TestTable,0000135598,1230761605500.
> {code}
> 2008-12-31 22:13:35,528 [IPC Server handler 2 on 60000] INFO
> org.apache.hadoop.hbase.master.ServerManager: Received MSG_REPORT_SPLIT:
> TestTable,0000116170,1230761152219: TestTable,0000116170,1230761152219 split;
> daughters: TestTable,0000116170,1230761605500,
> TestTable,0000135598,1230761605500 from XX.XX.XX.142:60020
> 2008-12-31 22:13:35,528 [IPC Server handler 2 on 60000] INFO
> org.apache.hadoop.hbase.master.RegionManager: assigning region
> TestTable,0000135598,1230761605500 to server XX.XX.XX.142:60020
> 2008-12-31 22:13:38,561 [IPC Server handler 6 on 60000] INFO
> org.apache.hadoop.hbase.master.ServerManager: Received MSG_REPORT_OPEN:
> TestTable,0000135598,1230761605500 from XX.XX.XX.142:60020
> 2008-12-31 22:13:38,562 [HMaster] INFO
> org.apache.hadoop.hbase.master.ProcessRegionOpen$1:
> TestTable,0000135598,1230761605500 open on XX.XX.XX.142:60020
> 2008-12-31 22:13:38,562 [HMaster] INFO
> org.apache.hadoop.hbase.master.ProcessRegionOpen$1: updating row
> TestTable,0000135598,1230761605500 in region .META.,,1 with startcode
> 1230759988953 and server XX.XX.XX.142:60020
> 2008-12-31 22:13:44,640 [IPC Server handler 4 on 60000] DEBUG
> org.apache.hadoop.hbase.master.RegionManager: Going to close region
> TestTable,0000135598,1230761605500
> 2008-12-31 22:13:50,441 [IPC Server handler 9 on 60000] INFO
> org.apache.hadoop.hbase.master.RegionManager: assigning region
> TestTable,0000135598,1230761605500 to server XX.XX.XX.139:60020
> 2008-12-31 22:13:53,457 [IPC Server handler 5 on 60000] INFO
> org.apache.hadoop.hbase.master.ServerManager: Received
> MSG_REPORT_PROCESS_OPEN: TestTable,0000135598,1230761605500 from
> XX.XX.XX.139:60020
> 2008-12-31 22:13:53,458 [IPC Server handler 5 on 60000] INFO
> org.apache.hadoop.hbase.master.ServerManager: Received MSG_REPORT_OPEN:
> TestTable,0000135598,1230761605500 from XX.XX.XX.139:60020
> 2008-12-31 22:13:53,458 [HMaster] INFO
> org.apache.hadoop.hbase.master.ProcessRegionOpen$1:
> TestTable,0000135598,1230761605500 open on XX.XX.XX.139:60020
> 2008-12-31 22:13:53,458 [HMaster] INFO
> org.apache.hadoop.hbase.master.ProcessRegionOpen$1: updating row
> TestTable,0000135598,1230761605500 in region .META.,,1 with startcode
> 1230759988788 and server XX.XX.XX.139:60020
> 2008-12-31 22:13:53,688 [IPC Server handler 6 on 60000] INFO
> org.apache.hadoop.hbase.master.ServerManager: Received MSG_REPORT_CLOSE:
> TestTable,0000135598,1230761605500 from XX.XX.XX.142:60020
> 2008-12-31 22:13:53,688 [HMaster] DEBUG
> org.apache.hadoop.hbase.master.HMaster: Processing todo: ProcessRegionClose
> of TestTable,0000135598,1230761605500, false
> 2008-12-31 22:13:54,263 [IPC Server handler 7 on 60000] INFO
> org.apache.hadoop.hbase.master.RegionManager: assigning region
> TestTable,0000135598,1230761605500 to server XX.XX.XX.141:60020
> 2008-12-31 22:13:57,273 [IPC Server handler 9 on 60000] INFO
> org.apache.hadoop.hbase.master.ServerManager: Received
> MSG_REPORT_PROCESS_OPEN: TestTable,0000135598,1230761605500 from
> XX.XX.XX.141:60020
> 2008-12-31 22:14:03,917 [IPC Server handler 0 on 60000] INFO
> org.apache.hadoop.hbase.master.ServerManager: Received MSG_REPORT_OPEN:
> TestTable,0000135598,1230761605500 from XX.XX.XX.141:60020
> 2008-12-31 22:14:03,917 [HMaster] INFO
> org.apache.hadoop.hbase.master.ProcessRegionOpen$1:
> TestTable,0000135598,1230761605500 open on XX.XX.XX.141:60020
> 2008-12-31 22:14:03,918 [HMaster] INFO
> org.apache.hadoop.hbase.master.ProcessRegionOpen$1: updating row
> TestTable,0000135598,1230761605500 in region .META.,,1 with startcode
> 1230759989031 and server XX.XX.XX.141:60020
> 2008-12-31 22:14:29,350 [RegionManager.metaScanner] DEBUG
> org.apache.hadoop.hbase.master.BaseScanner:
> TestTable,0000135598,1230761605500 no longer has references to
> TestTable,0000116170,1230761152219
> {code}
> See how we choose to assign before we get the close back from the
> regionserver.
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