@Override
            public void indicateError(Throwable t) {
              LOG.info("Error registering dag with"
                  + " appId=" + currentQueryIdentifierProto.getApplicationIdString()
                  + " dagId=" + currentQueryIdentifierProto.getDagIndex()
                  + " to node " + node.getHost());
              processSendError(t);
              callback.setError(null, 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