Triage to set target milestone
After reading some of the code in the patch. It requires Zookeeper 3.4.0 or later. I also checked Cloudera CDH3 which is going to be using ZooKeeper 3.3.1. So if we want to use this we'll need to manually upgrade ZooKeeper to something newer.
Hrm. Well, eventually, we will want to be administrating our own ZK cluster, but we don't need to deal with that right now.