How to use

getInternalDiscoveryPath

method

in

org.apache.druid.server.initialization.ZkPathsConfig

@Override
public DruidNodeDiscovery getForNodeType(NodeType nodeType)
{
 Preconditions.checkState(lifecycleLock.awaitStarted(1, TimeUnit.MILLISECONDS));
 return nodeTypeWatchers.computeIfAbsent(
   nodeType,
   nType -> {
    log.info("Creating NodeTypeWatcher for nodeType [%s].", nType);
    NodeTypeWatcher nodeTypeWatcher = new NodeTypeWatcher(
      listenerExecutor,
      curatorFramework,
      config.getInternalDiscoveryPath(),
      jsonMapper,
      nType
    );
    nodeTypeWatcher.start();
    log.info("Created NodeTypeWatcher for nodeType [%s].", nType);
    return nodeTypeWatcher;
   }
 );
}

@Override
public void announce(DiscoveryDruidNode discoveryDruidNode)
{
 try {
  log.info("Announcing [%s].", discoveryDruidNode);
  String path = ZKPaths.makePath(
    config.getInternalDiscoveryPath(),
    discoveryDruidNode.getNodeType().toString(),
    discoveryDruidNode.getDruidNode().getHostAndPortToUse()
  );
  announcer.announce(path, jsonMapper.writeValueAsBytes(discoveryDruidNode));
  log.info("Announced [%s].", discoveryDruidNode);
 }
 catch (JsonProcessingException e) {
  throw Throwables.propagate(e);
 }
}

 @Override
 public void unannounce(DiscoveryDruidNode discoveryDruidNode)
 {
  log.info("Unannouncing [%s].", discoveryDruidNode);

  String path = ZKPaths.makePath(
    config.getInternalDiscoveryPath(),
    discoveryDruidNode.getNodeType().toString(),
    discoveryDruidNode.getDruidNode().getHostAndPortToUse()
  );
  announcer.unannounce(path);

  log.info("Unannounced [%s].", discoveryDruidNode);
 }
}

@Override
public DruidNodeDiscovery getForNodeType(String nodeType)
{
 Preconditions.checkState(lifecycleLock.awaitStarted(1, TimeUnit.MILLISECONDS));
 return nodeTypeWatchers.compute(
   nodeType,
   (k, v) -> {
    if (v != null) {
     return v;
    }
    log.info("Creating NodeTypeWatcher for nodeType [%s].", nodeType);
    NodeTypeWatcher nodeTypeWatcher = new NodeTypeWatcher(
      listenerExecutor,
      curatorFramework,
      config.getInternalDiscoveryPath(),
      jsonMapper,
      nodeType
    );
    nodeTypeWatcher.start();
    log.info("Created NodeTypeWatcher for nodeType [%s].", nodeType);
    return nodeTypeWatcher;
   }
 );
}

@Override
public void announce(DiscoveryDruidNode discoveryDruidNode)
{
 try {
  log.info("Announcing [%s].", discoveryDruidNode);
  announcer.announce(
    ZKPaths.makePath(
      config.getInternalDiscoveryPath(),
      discoveryDruidNode.getNodeType(),
      discoveryDruidNode.getDruidNode().getHostAndPortToUse()
    ),
    jsonMapper.writeValueAsBytes(discoveryDruidNode)
  );
  log.info("Announced [%s].", discoveryDruidNode);
 }
 catch (JsonProcessingException e) {
  throw Throwables.propagate(e);
 }
}

 @Override
 public void unannounce(DiscoveryDruidNode discoveryDruidNode)
 {
  log.info("Unannouncing [%s].", discoveryDruidNode);

  announcer.unannounce(
    ZKPaths.makePath(
      config.getInternalDiscoveryPath(),
      discoveryDruidNode.getNodeType(),
      discoveryDruidNode.getDruidNode().getHostAndPortToUse()
    )
  );

  log.info("Unannounced [%s].", discoveryDruidNode);
 }
}