Hello!
I think if you don't use any new ZooKeeper feature, then it is safe to use
the 3.5.8 or 3.6.1 clients with the old (3.4.6) server. But as far as I
know, the other approach should work too: using 3.4.6 clients with 3.5.8
or 3.6.1 servers. I don't really know which way would be better for
ZooKeeper.
When we were planning our upgrade in 2019, we did some compatibility tests
with some small sample applications on a matrix of different server-client
combinations to actually make sure we won't have any problems, and found
back there no incompatibilities. (this tests were not executed yet on 3.5.8
and 3.6.1, but I expect the same results on the more recent versions)
Before your upgrade, make sure you check:
https://cwiki.apache.org/confluence/display/ZOOKEEPER/Upgrade+FAQ
Kind regards,
Mate
On Fri, Aug 28, 2020 at 10:31 PM wrote:
> It should work either way but I would suggest to upgrade zookeeper server
> version 1st .
>
> On 8/28/20, 1:29 PM, "John Lindwall" wrote:
>
> [External]
>
>
> We are considering upgrading our zookeeper servers from 3.4.6 to
> either 3.5.8 or 3.6.1. I wonder if will work if we proactively upgrade our
> client versions from 3.4.6 to the new, more current version (3.5.8 or
> 3.6.1) and run that newer client code against the older 3.4.6 servers?
> Later when we update the servers, then the client version and the server
> versions will match.
> Obviously we will not make use of any new API methods added to
> zookeeper since 3.4.6; in fact we will simply be recompiling our existing
> client code against the new libs (which works as I just tested it).
> Thanks!
> -- John
>
>
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