[jira] [Created] (HBASE-21006) Balancer - data locality drops hugely after rolling restarts on cluster, not factoring in data locality enough?

["Hari Sekhon (JIRA)" <ji...@apache.org>]

Hari Sekhon created HBASE-21006:
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             Summary: Balancer - data locality drops hugely after rolling restarts on cluster, not factoring in data locality enough?
                 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


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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