@Override
          public void indicateError(Throwable t) {
            LOG.warn("Failed to send update fragment request for {}", attemptId.toString());
            processSendError(t);
            callback.setError(ctx, t);
          }
@param node
@param callback
@return if it was possible to attempt the registration. Sometimes it's
not possible because is a dag is not running
llap-tez/src/java/org/apache/hadoop/hive/llap/tezplugins/LlapTaskCommunicator.java