On 8/30/23 13:25, Oakley, Craig (NIH/NLM/NCBI) [C] wrote:
In previous upgrades, we have set luceneMatchVersion to match our version of
Solr
But we were noticing that Solr 9.2.1 uses Lucene version 9.4.2
Should we continue using the Solr version (as we have in the past) or should
luceneMatchVersion be 9.4.2 (as the name would imply)?
The other reply you got is correct. That will affect Lucene. Since the
project split, Lucene is putting out new minor versions faster than Solr is.
The Solr version on my personal server is 9.4.0-SNAPSHOT, which has
Lucene 9.7.0. I currently have my lMV set to 10.10.10, which for all
currently released versions is effectively the same as LATEST ... except
that with LATEST, you get a warning in the solr log every time a core
starts up.
The only time I would ever suggest using a setting that's not the same
as the Lucene version (or newer) is when you know for SURE that setting
an older version will enable older behavior that you need. This
happened to me with Solr 4.8.0, where a major bug in WordDelimiterFilter
was fixed, which broke some queries on that install. For a while, I had
lMV set to 4.7.0 on my dev install, until I was able to devise a new
schema that worked with the new behavior.
Thanks,
Shawn
