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Posted to issues@hbase.apache.org by "Clara Xiong (JIRA)" <ji...@apache.org> on 2016/02/11 02:11:18 UTC
[jira] [Commented] (HBASE-14129) If any regionserver gets shutdown
uncleanly during full cluster restart, locality looks to be lost
[ https://issues.apache.org/jira/browse/HBASE-14129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15142089#comment-15142089 ]
Clara Xiong commented on HBASE-14129:
-------------------------------------
The proposed fix didn't work and I went with a different solution.
HBASE-15251
> If any regionserver gets shutdown uncleanly during full cluster restart, locality looks to be lost
> --------------------------------------------------------------------------------------------------
>
> Key: HBASE-14129
> URL: https://issues.apache.org/jira/browse/HBASE-14129
> Project: HBase
> Issue Type: Bug
> Reporter: churro morales
> Fix For: 2.0.0, 1.3.0
>
> Attachments: HBASE-14129.patch
>
>
> We were doing a cluster restart the other day. Some regionservers did not shut down cleanly. Upon restart our locality went from 99% to 5%. Upon looking at the AssignmentManager.joinCluster() code it calls AssignmentManager.processDeadServersAndRegionsInTransition().
> If the failover flag gets set for any reason it seems we don't call assignAllUserRegions(). Then it looks like the balancer does the work in assigning those regions, we don't use a locality aware balancer and we lost our region locality.
> I don't have a solid grasp on the reasoning for these checks but there could be some potential workarounds here.
> 1. After shutting down your cluster, move your WALs aside (replay later).
> 2. Clean up your zNodes
> That seems to work, but requires a lot of manual labor. Another solution which I prefer would be to have a flag for ./start-hbase.sh --clean
> If we start master with that flag then we do a check in AssignmentManager.processDeadServersAndRegionsInTransition() thus if this flag is set we call: assignAllUserRegions() regardless of the failover state.
> I have a patch for the later solution, that is if I am understanding the logic correctly.
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