Lei Chen created HBASE-13965:
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Summary: Stochastic Load Balancer JMX Metrics
Key: HBASE-13965
URL: https://issues.apache.org/jira/browse/HBASE-13965
Project: HBase
Issue Type: Improvement
Components: Balancer, metrics
Reporter: Lei Chen
Today’s default HBase load balancer (the Stochastic load balancer) is cost
function based. The cost function weights are tunable but no visibility into
those cost function results is directly provided.
A driving example is a cluster we have been tuning which has skewed rack size
(one rack has half the nodes of the other few racks). We are tuning the cluster
for uniform response time from all region servers with the ability to tolerate
a rack failure. Balancing LocalityCost, RegionReplicaRack Cost and
RegionCountSkew Cost is difficult without a way to attribute each cost
function’s contribution to overall cost.
What this jira proposes is to provide visibility via JMX into each cost
function of the stochastic load balancer, as well as the overall cost of the
balancing plan.
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