On 1/22/2016 8:37 AM, Jack Krupansky wrote: > The doc is silent on this issue of SolrJ vs. server version compatibility > in general (e.g., 4 vs. 5.) That's not an absolute assurance, but at least > it's a possibility. And and far as I know, if you had a SolrJ 4 app and > upgraded the server (with no change in the index or data model), the app > should work fine. So... if you stick with SolrJ 4 and use the Solr 4 doc as > your guide, you should be okay. That's the theory. > > Worst case, you would have to deploy a Solr 4 server. That's not the > preferred choice, but is a decent backup plan.
The doc is indeed silent on the issue of cross-version compatibility. I have personally mixed 4.x and 5.x versions when using the HttpSolrClient (HttpSolrServer in 4.x) object and had no problems. This works REALLY well. I have seen evidence on this list that trying to mix versions when using the CloudSolrClient (CloudSolrServer in older versions) will not work when the version gap is more than a couple of minor releases. When SolrJ is older, even a bump of one minor Solr version might be too much, due to changes required to support new functionality or fix stubborn bugs. Thanks, Shawn
