Make the load balancer run with a gentle hand
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Key: HBASE-3803
URL: https://issues.apache.org/jira/browse/HBASE-3803
Project: HBase
Issue Type: Improvement
Reporter: stack
We need 'smoothing' of balancer region move.... Yesterday we brought a
regionserver back online into a smallish cluster that was under load and the
balance run unloaded a bunch of regions all in the one go which put a dent in
the throughput when a bunch of regions went offline at the one time. It'd be
sweet if the balancer ran at a context appropriate 'rate'; when under load, it
should move regions 'gently' rather than all as a big bang (the decommission
script will move a region at a time, verifying it deployed in its new location
before moving another... this can take ages to complete but its proven
minimally disruptive to loadings)
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