private void loadConf(Configuration conf) {
    this.offPeakHours = OffPeakHours.getInstance(conf);
    isBalancerDecisionRecording = conf.getBoolean(BaseLoadBalancer.BALANCER_DECISION_BUFFER_ENABLED,
      BaseLoadBalancer.DEFAULT_BALANCER_DECISION_BUFFER_ENABLED);
    isBalancerRejectionRecording =
      conf.getBoolean(BaseLoadBalancer.BALANCER_REJECTION_BUFFER_ENABLED,
        BaseLoadBalancer.DEFAULT_BALANCER_REJECTION_BUFFER_ENABLED);
    if (isBalancerDecisionRecording || isBalancerRejectionRecording) {
      this.namedQueueRecorder = NamedQueueRecorder.getInstance(conf);
    } else {
      this.namedQueueRecorder = null;
    }
  }
Use to add balancer decision history to ring-buffer
hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/MasterClusterInfoProvider.java