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https://issues.apache.org/jira/browse/HBASE-1573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12723333#action_12723333
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stack commented on HBASE-1573:
------------------------------
Will test on pset cluster.
> Holes in master state change; updated startcode and server go into .META. but
> catalog scanner just got old values
> -----------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-1573
> URL: https://issues.apache.org/jira/browse/HBASE-1573
> Project: Hadoop HBase
> Issue Type: Bug
> Reporter: stack
> Fix For: 0.19.4
>
> Attachments: 1573-v2.patch, 1573-v3.patch, 1573.patch
>
>
> Here is example of a scan that takes a while because 6k regions acting on
> stale data resulting in double assignment of region:
> {code}
> hbase-Powerset-master-aa0-000-8.u.powerset.com.log.2009-06-22:2009-06-22
> 10:56:06,220 INFO org.apache.hadoop.hbase.master.ServerManager: Received
> MSG_REPORT_OPEN: enwikibase,Cwj1sehVeEbnrUDR_j0xok==,1245604540748:
> safeMode=false from XX.XX.45.121:20020
> hbase-Powerset-master-aa0-000-8.u.powerset.com.log.2009-06-22:2009-06-22
> 10:56:06,220 INFO org.apache.hadoop.hbase.master.RegionServerOperation:
> enwikibase,Cwj1sehVeEbnrUDR_j0xok==,1245604540748 open on XX.XX.45.121:20020
> hbase-Powerset-master-aa0-000-8.u.powerset.com.log.2009-06-22:2009-06-22
> 10:56:06,220 INFO org.apache.hadoop.hbase.master.RegionServerOperation:
> updating row enwikibase,Cwj1sehVeEbnrUDR_j0xok==,1245604540748 in region
> .META.,,1 with with startcode !?B and server XX.XX.45.121:20020
> hbase-Powerset-master-aa0-000-8.u.powerset.com.log.2009-06-22:2009-06-22
> 10:56:06,397 DEBUG org.apache.hadoop.hbase.master.BaseScanner: Current
> assignment of enwikibase,Cwj0sehVeEbnrUDR_j0xok==,1245604540748 is not valid;
> Server 'XX.XX.44.95:20020' unknown.
> hbase-Powerset-master-aa0-000-8.u.powerset.com.log.2009-06-22:2009-06-22
> 10:56:06,582 INFO org.apache.hadoop.hbase.master.RegionManager: Assigning
> region enwikibase,Cwj1sehVeEbnrUDR_j0xok==,1245604540748 to XX.XX.45.97:20020
> hbase-Powerset-master-aa0-000-8.u.powerset.com.log.2009-06-22:2009-06-22
> 10:56:09,587 INFO org.apache.hadoop.hbase.master.ServerManager: Received
> MSG_REPORT_PROCESS_OPEN: enwikibase,Cwj1sehVeEbnrUDR_j0xok==,1245604540748:
> safeMode=false from XX.XX.45.97:20020
> hbase-Powerset-master-aa0-000-8.u.powerset.com.log.2009-06-22:2009-06-22
> 10:56:12,614 INFO org.apache.hadoop.hbase.master.ServerManager: Received
> MSG_REPORT_OPEN: enwikibase,Cwj1sehVeEbnrUDR_j0xok==,1245604540748:
> safeMode=false from XX.XX.45.97:20020
> hbase-Powerset-master-aa0-000-8.u.powerset.com.log.2009-06-22:2009-06-22
> 10:56:13,549 INFO org.apache.hadoop.hbase.master.RegionServerOperation:
> enwikibase,Cwj1sehVeEbnrUDR_j0xok==,1245604540748 open on XX.XX.45.97:20020
> hbase-Powerset-master-aa0-000-8.u.powerset.com.log.2009-06-22:2009-06-22
> 10:56:13,549 INFO org.apache.hadoop.hbase.master.RegionServerOperation:
> updating row enwikibase,Cwj1sehVeEbnrUDR_j0xok==,1245604540748 in region
> .META.,,1 with with startcode !?? and server XX.XX.45.97:20020
> {code}
> We've just updated the server info in the master because of the region open
> message but the scan sees old info in the .META. table though .META. was just
> updated.
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