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https://issues.apache.org/jira/browse/HBASE-1573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HBASE-1573:
-------------------------
Fix Version/s: (was: 0.20.0)
Added note to getting started in 0.19 and TRUNK about upping handlers. Its
hard to just up the handlers above 10. We shouldn't be dealing with this at
all.... the RPC should just be nio so we don't have these kinds of things to
mess with. So, number of handlers is important particularly around startup of
big cluster . Here .META. gets hammered with connections and edits need to go
in somewhat promptly. Handler counts helps with this.
Moving this issue out of 0.20 now. We'll address the actual issue with master
rewrite.
> 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
> Priority: Blocker
> 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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