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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