code: private static void registerHttpAddress(AvatarZooKeeperClient zk, Configuration originalConf,
        Configuration conf, boolean toOverwrite) throws UnsupportedEncodingException, IOException {
      LOG.info("Updating Http Address information in ZooKeeper");
      String addr = conf.get(FSConstants.DFS_NAMENODE_HTTP_ADDRESS_KEY);
      String defaultAddr = originalConf
          .get(FSConstants.DFS_NAMENODE_HTTP_ADDRESS_KEY);
      registerSocketAddress(zk, defaultAddr, addr, toOverwrite);
      registerAliases(zk, conf, FSConstants.DFS_HTTP_ALIASES, addr, toOverwrite);
    }
docs: Registers the http address of the namenode in the zookeeper