@Override
  public void onConfigurationChange(Configuration conf) {
    super.onConfigurationChange(conf);

    if (balancer instanceof ConfigurationObserver) {
      ((ConfigurationObserver) balancer).onConfigurationChange(conf);
    }
  }
An {@link RpcExecutor} that will balance requests evenly across all its queues, but still remains
efficient with a single queue via an inlinable queue balancing mechanism. Defaults to FIFO but
you can pass an alternate queue class to use.
hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/BalancedQueueRpcExecutor.java