protected String getCallMethod(final CallRunner task) {
    RpcCall call = task.getRpcCall();
    if (call != null && call.getMethod() != null) {
      return call.getMethod().getName();
    }
    return null;
  }
A very simple {@code }RpcScheduler} that serves incoming requests in order. This can be used for
HMaster, where no prioritization is needed.
hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/FifoRpcScheduler.java