On 3/13/23 09:46, Masseau Olivier wrote:
I've read this but I don't know if it is still true :
https://cwiki.apache.org/confluence/display/solr/solrj
Our goal is to have our Java application which is using SolrJ, to be compatible
with both Solr 7 and Solr 8 (as some of our clients want to use Solr 8 and some
are still not prepared to migrate).
If you're using the http clients, there should be good compatibility
across a wide range of versions. I've seen people using SolrJ 4.x with
8.x or 9.x servers and have everything work, and vice versa. This will
only work if the solrconfig/schema that is upgraded from the earlier
version is nearly identical in function, so the same HTTP requests are
compatible with the config.
If you're using the Cloud client, the situation is far more murky. This
is because the client doesn't just send HTTP requests, it interacts
directly with zookeeper and is tightly integrated with the SolrCloud
cluster. I personally would want Solr and SolrJ to be in the same major
version in that situation, and I would strive to make them the EXACT
same version if possible.
That page you linked should be updated with better SolrCloud info. I
can tell by reading it that it's VERY old, written before 5.0 was released.
Thanks,
Shawn
