public HelixAdmin getHelixAdmin(String zkAddr) {
    return new ZKHelixAdmin(zkAddr);
  }
Get a reference to a {@link HelixAdmin}
@param zkAddr the address identifying the zk service to which this request is to be made.
@return the reference to the {@link HelixAdmin}.
ambry-clustermap/src/main/java/com/github/ambry/clustermap/HelixAdminFactory.java