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https://issues.apache.org/jira/browse/HBASE-21006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16568720#comment-16568720
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Hari Sekhon commented on HBASE-21006:
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I will do follow up analysis of this on Monday as it's late here in London.
I saw HBASE-18164 but I didn't think it quite fitted, and I didn't see
HBASE-18036. If it's covered by that one then I'll close this as a duplicate
after we review it next week.
> Balancer - data locality drops 30-40% across all nodes after every
> cluster-wide rolling restart, not migrating regions back to original
> RegionServers?
> ------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-21006
> URL: https://issues.apache.org/jira/browse/HBASE-21006
> Project: HBase
> Issue Type: Improvement
> Components: Balancer
> Affects Versions: 1.1.2
> Environment: HDP 2.6
> Reporter: Hari Sekhon
> Priority: Major
>
> After doing rolling restarts of my HBase cluster the data locality drops by
> 30-40% every time which implies the stochastic balancer is not optimizing for
> data locality enough, at least not under the circumstance of rolling
> restarts, and that it must not be balancing the regions back to their
> original RegionServers.
> The stochastic balancer is supposed to take data locality in to account but
> if this is the case, surely it should move regions back to their original
> RegionServers and data locality should return back to around where it was,
> not drop by 30-40% percent every time I need to do some tuning and a rolling
> restart.
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