private static String extractNodeName(ChildData childData) {
    String nodeName = childData.getPath();
    int ix = nodeName.lastIndexOf("/");
    if (ix >= 0) {
      nodeName = nodeName.substring(ix + 1);
    }
    return nodeName;
  }
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