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From "Lei Chen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-13965) Stochastic Load Balancer JMX Metrics
Date Wed, 24 Jun 2015 21:40:04 GMT
Lei Chen created HBASE-13965:

             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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