private static String extractNodeName(ChildData childData) {
    String nodeName = childData.getPath();
    int ix = nodeName.lastIndexOf("/");
    if (ix >= 0) {
      nodeName = nodeName.substring(ix + 1);
    }
    return nodeName;
  }
A dynamically changing instance in an Llap Service. Can become inactive if failing or can be
blacklisted (set to 0 capacity) if too slow (See: BlacklistingLlapMetricsListener).
llap-client/src/java/org/apache/hadoop/hive/llap/registry/impl/LlapZookeeperRegistryImpl.java