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https://issues.apache.org/jira/browse/HBASE-21006?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hari Sekhon updated HBASE-21006:
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Summary: Balancer - data locality drops 30-40% after rolling restarts on
cluster, not migrating regions back to original regionservers (was: Balancer -
data locality drops hugely after rolling restarts on cluster, not factoring in
data locality enough?)
> Balancer - data locality drops 30-40% after rolling restarts on cluster, 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.
> 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
> RegionServer 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
> restarts.
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