Load balancer shouldn't move the same region in two consective balancing actions
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Key: HBASE-3945
URL: https://issues.apache.org/jira/browse/HBASE-3945
Project: HBase
Issue Type: Improvement
Reporter: Ted Yu
Keeping a region on the same region server would give good stability for active
scanners.
We shouldn't reassign the same region in two successive calls to
balanceCluster().
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