@Override
            public void setResponse(RegisterDagResponseProto response) {
              callback.setDone(null, currentQueryIdentifierProto);
            }
@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