Guanghao Zhang created HBASE-15529:
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Summary: Override needBalance in StochasticLoadBalancer
Key: HBASE-15529
URL: https://issues.apache.org/jira/browse/HBASE-15529
Project: HBase
Issue Type: Improvement
Reporter: Guanghao Zhang
Priority: Minor
StochasticLoadBalancer includes cost functions to compute the cost of region
rount, r/w qps, table load, region locality, memstore size, and storefile size.
Every cost function returns a number between 0 and 1 inclusive and the computed
costs are scaled by their respective multipliers. The bigger multiplier means
that the respective cost function have the bigger weight. But needBalance
decide whether to balance only by region count and doesn't consider r/w qps,
locality even you config these cost function with bigger multiplier.
StochasticLoadBalancer should override needBalance and decide whether to
balance by it's configs of cost function.
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