@Override
    protected String getCallMethod(final CallRunner task) {
      RpcCall call = task.getRpcCall();
      if (call.getHeader() != null) {
        return call.getHeader().getMethodName();
      }
      return null;
    }
Override this method because we can't mock a Descriptors.MethodDescriptor
hbase-server/src/test/java/org/apache/hadoop/hbase/ipc/TestMasterFifoRpcScheduler.java