Hari Sekhon created AMBARI-24334:
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Summary: HBase Balancer - temporarily disable balancer for HBase
rolling restart
Key: AMBARI-24334
URL: https://issues.apache.org/jira/browse/AMBARI-24334
Project: Ambari
Issue Type: Improvement
Components: ambari-server, rolling-upgrade
Affects Versions: 2.5.2
Reporter: Hari Sekhon
Temporarily disable HBase Balancer when doing HBase rolling restarts.
I've noticed a drop in data locality after doing an HBase rolling restart
looking at the Ambari Grafana graph found on the HBase Regionservers dashboard
-> Locality (row at bottom) -> Percent Files Local graph.
I believe the HBase balancer should be temporarily disabled (if enabled) and
then re-enabled after all RegionServers have successfully completed. One must
be careful to only re-enable the balancer if it was enabled before the rolling
restart was initiated.
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