Jon, Ibrahim, Thanks for the feedback. Do people have any production experience with ZK clients running on different JDK / hardware architecture (32/64bit) from the ZK server?
I looked into the regression tests some: The list of branches/platforms tested seems to be here: https://builds.apache.org/view/S-Z/view/ZooKeeper/ Focusing on the 3.4 branch, I looked at the Oracle JDK tests, and from these files https://builds.apache.org/view/All/job/ZooKeeper_branch34_jdk7/lastStableBuild/consoleText https://builds.apache.org/view/All/job/ZooKeeper_branch34_jdk8/lastStableBuild/consoleText I see, for jdk7: jdk1.7.0_25-32 os.arch=i386 for jdk8: 1.8.0_20 os.arch=amd64 (It seems to me that in all the tests the clients and servers run using the same JDK / arch)
