Hi, FYI. I've been doing some tests mixing zookeeperclient/server versions onhbase trunk, by executing medium category unit tests with a standalone zookeeper server (Mixing versions 3.3 & 3.4 is officially supported by Zookeeper, but was worth checking)
I tested: Zookeeper Server server 3.3.4 and 3.4.2 Zookeeper Client API 3.3.4 and 3.4.2 (with some changes in hbase to make it build with 3.3 API). Meaning; Client 3.4.2 --> Server 3.4.2 Client 3.3.4 --> Server 3.4.2 Client 3.3.4 --> Server 3.3.4 Client 3.4.2 --> Server 3.3.4 Conclusion: - It works, except of course if you're activating secure login (the related unit tests will hang). - I had a strange random error with the 3.3.4 server (whatever the client version), but it seems to be linked only to the start/stop phase (zookeeper server surviving to a stop request). - It's difficult from the client to know what's the zookeeper server version. A zookeeper jira was created for this (ZOOKEEPER-1381) - if you use a 3.4.2 feature like "multi" on a 3.3 server, it hangs: once again, it's up to the developer/administrator to make sure he's not using something specific to the 3.4 server, hence the jira 1381 if we want stuff like warnings or implementations optimized for a given server. Cheers, N.
