public static void initializeAndStart(Configuration conf, SecretManager sm) throws Exception {
    if (!initing.getAndSet(true)) {
      INSTANCE = new LlapOutputFormatService(conf, sm);
      INSTANCE.start();
      started.set(true);
    }
  }
Responsible for sending back result set data to the connections
made by external clients via the LLAP input format.
ql/src/java/org/apache/hadoop/hive/llap/LlapOutputFormatService.java