public String currentUser() {
    try {
      return UserGroupInformation.getCurrentUser().getShortUserName();
    } catch (IOException e) {
      throw new RuntimeException(e);
    }
  }
Get the ensemble server addresses from the configuration. The format is: host1:port,
host2:port..

@param conf configuration
llap-client/src/java/org/apache/hadoop/hive/registry/impl/ZkRegistryBase.java