Make region balancing parallel with balancer.balanceCluster()
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Key: HBASE-4464
URL: https://issues.apache.org/jira/browse/HBASE-4464
Project: HBase
Issue Type: Improvement
Reporter: Ted Yu
balancer.balanceCluster() generates RegionPlans for HMaster.balance() to
execute.
We don't retract any RegionPlan in balancer.balanceCluster().
In the near future, more complex algorithm would be introduced to try achieving
maximum block location affinity for the regions to be moved. This means
balancer.balanceCluster() would take longer to return.
This JIRA makes region balancing parallel with balancer.balanceCluster()
Meaning region balancing would be performed when balancer.balanceCluster() is
still running.
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