Just to share one of our developer noticed issues when trying to use SolrJ 4.10.x against Solr 5.4.0 with chroot enabled. After she upgraded to SolrJ 5.3.1, it worked.
Thanks, Susheel On Fri, Jan 22, 2016 at 11:20 AM, Jack Krupansky <jack.krupan...@gmail.com> wrote: > To be clear, having separate Solr servers on different versions should > definitely not be a problem. The only potential difficulty here is the > SolrJ vs. server back-compat issue. > > -- Jack Krupansky > > On Fri, Jan 22, 2016 at 10:57 AM, <jimi.hulleg...@svensktnaringsliv.se> > wrote: > > > Shawn wrote: > > > > > > If you are NOT running SolrCloud, then that should work with no > problem. > > > The HTTP API is fairly static and has not seen any major upheaval > > recently. > > > If you're NOT running SolrCloud, you may even be able to replace the > > > SolrJ jar in your existing system with the 5.4.1 version (and update > > > SolrJ's dependent jars) and have everything continue to work. > > > > > > If you ARE running SolrCloud, I would not try mixing 4.x and 5.x, > > > in either direction. SolrCloud is evolving very quickly ... I wouldn't > > > even mix *minor* versions, much less *major* versions. > > > There are differences in how the zookeeper database is laid out, > > > and mixing versions is not guaranteed to work, especially if SolrJ > > > is older than Solr. If the version difference is small and SolrJ is > > newer > > > than Solr, there's a chance of success, but with the situation you > > > have described, SolrCloud would likely not work. > > > > When you talk about not mixing 4.x and 5.x when using SolrCloud, you mean > > between the client and the server that talk to each other, right? Or > would > > it be a problem keeping our existing non cloud solr 4.x server, upgrading > > the client solrj jar to 5.x (assuming this works, like you and others > here > > seem to think it should/could), and then adding a new solr cloud 5.x > > server? That way, there the two separate communication "channels" are > solrj > > 5.x <--> solr 4.x server, and, solrj 5.x <--> solrcloud 5.x. > > > > Or does the mere presense of a solr 4.x server and a solr cloud 5.x > server > > on the same network cause problems, even when they don't know about > > eachother? > > > > Regards > > /Jimi > > >
