@Override
  public synchronized void stop() {
    super.stop();
    LOG.info("Stopping KillQueryZookeeperManager service.");
    CloseableUtils.closeQuietly(killQueryListener);
    CloseableUtils.closeQuietly(zooKeeperClient);
  }
Kill query coordination service.
When service discovery is enabled a local kill query can request a kill
on every other HS2 server with the queryId or queryTag and wait for confirmation on denial.
The communication is done through Zookeeper.
service/src/java/org/apache/hive/service/server/KillQueryZookeeperManager.java