@Override
  public String toString() {
    return new ToStringBuilder(this).append("initialFunctionCosts", initialFunctionCosts)
      .append("finalFunctionCosts", finalFunctionCosts).append("initTotalCost", initTotalCost)
      .append("computedTotalCost", computedTotalCost).append("computedSteps", computedSteps)
      .append("regionPlans", regionPlans).toString();
  }
History of balancer decisions taken for region movements.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/BalancerDecision.java