Balancer will willing try to rebalance thousands of regions in one go; needs an
upper bound added.
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Key: HBASE-3422
URL: https://issues.apache.org/jira/browse/HBASE-3422
Project: HBase
Issue Type: Improvement
Affects Versions: 0.90.0
Reporter: stack
See HBASE-3420. Therein, a wonky cluster had 5k regions on one server and < 1k
on others. Balancer ran and wanted to redistribute 3k+ all in one go. Madness.
If a load of rebalancing to be done, should be done somewhat piecemeal. We
need maximum regions to rebalance at a time upper bound at a minimum.
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