public BalancerDecision build() {
      return new BalancerDecision(initialFunctionCosts, finalFunctionCosts, initTotalCost,
        computedTotalCost, regionPlans, computedSteps);
    }
History of balancer decisions taken for region movements.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/BalancerDecision.java