Hi Ben-

What version of ZooKeeper are you using? In my testing it looks like 3.4
does a reverse lookup when creating the server principal
(https://github.com/apache/zookeeper/blob/branch-3.4/src/java/main/org/apache/zookeeper/ClientCnxn.java#L1011)
but 3.5/master do not
(https://github.com/apache/zookeeper/blob/branch-3.5/src/java/main/org/apache/zookeeper/ClientCnxn.java#L1104).

Let me know if that helps.

Thanks,
Abe

On Fri, Nov 17, 2017, at 12:01, Ben Wood wrote: