Guanghao Zhang created HBASE-14604:
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Summary: Improve MoveCostFunction in StochasticLoadBalancer
Key: HBASE-14604
URL: https://issues.apache.org/jira/browse/HBASE-14604
Project: HBase
Issue Type: Bug
Components: Balancer
Reporter: Guanghao Zhang
Assignee: Guanghao Zhang
The code in MoveCoseFunction:
{code}
return scale(0, cluster.numRegions + META_MOVE_COST_MULT, moveCost);
{code}
It uses cluster.numRegions + META_MOVE_COST_MULT as the max value when scale
moveCost to [0,1]. But this should use maxMoves as the max value when cluster
have a lot of regions.
Assume a cluster have 10000 regions, maxMoves is 2500, it only scale moveCost
to [0, 0.25].
Improve moveCost by use maxMoves.
{code}
return scale(0, Math.min(cluster.numRegions, maxMoves) + META_MOVE_COST_MULT,
moveCost);
{code}
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