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From Shawn Heisey <apa...@elyograg.org>
Subject A question about cross-version client/server compatibility
Date Tue, 22 May 2018 21:47:38 GMT
Somebody on the solr-user mailing list has posed a question about
whether they can use ZK 3.4.12 on the server side and a specific version
of Solr on the client side.  The specific version of Solr they're asking
about includes ZK 3.4.10 for its client code.

I would not anticipate any issues running with 3.4.10 on the client side
and 3.4.12 on the server side, so I think I can safely answer their
question, but I have a more general question to ask.

Are there ANY mixed version matchups that present problems, assuming the
server is running a newer version than the client?  I would never advise
running a server version that's older than the client.

The very first release of Solr to feature ZK integration was 4.0-ALPHA,
and eventually the stable 4.0.0 release, which included ZK 3.3.6.  The
subsequent version of Solr, which was 4.1.0, included ZK 3.4.5.  We
expect to include ZK 3.4.12 with the next release of Solr - 7.4.0.

I did a simple test with Solr 4.0.0 against a single ZK 3.4.12 server. 
It started just fine.  The testing was not exhaustive, but I saw zero

What I intend to say on the solr-user thread is that ZK 3.4.12 can be
used with ALL SolrCloud versions, but I thought I should sanity-check
that statement here before I make it.


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