@Override protected void serviceStop() throws Exception {
    druidNodes.stream().forEach(node -> {
      try {
        node.close();
      } catch (IOException e) {
        // nothing that we can really do about it
        log.error(String.format("Failed to stop druid node [%s]", node.getNodeType()), e);
      }
    });
  }
Checks to see if a specific port is available.

@param port the port to check for availability
itests/qtest-druid/src/main/java/org/apache/hive/druid/MiniDruidCluster.java