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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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Description:
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.
was:
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
restarts.
> Balancer - data locality drops 30-40% after each 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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