@Override
  public void onCreate(LlapServiceInstance serviceInstance, int ephSeqVersion) {
    LlapManagementProtocolClientImpl client = clientFactory.create(serviceInstance);
    llapClients.put(serviceInstance.getWorkerIdentity(), client);

  }
Collect metrics from the llap daemons in every given milliseconds.
llap-tez/src/java/org/apache/hadoop/hive/llap/tezplugins/metrics/LlapMetricsCollector.java