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https://issues.apache.org/jira/browse/HBASE-1104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12660521#action_12660521
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Jim Kellerman commented on HBASE-1104:
--------------------------------------
Closing used to mean "marked to close".
Closed was set when the master told the region server to close the region.
When the master received the confirmation from the region server,
ProcessRegionClose either set the state to unassigned (if it was to be
reassigned)
or removed it from the map if it was being offlined.
> 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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