I run
dovecot-2.3.18
, & am deploying Solr search with 'dovecot-fts-solr'
I run Solr standalone.
When creating a dedicated 'dovecot' core, cp'ing from Dovecot's included solr
schemas
ls -al /usr/share/doc/dovecot/solr-*
-rw-r--r-- 1 root root 12K Dec 3 06:48
/usr/share/doc/dovecot/solr-config-7.7.0.xml
-rw-r--r-- 1 root root 2.7K Dec 3 06:48
/usr/share/doc/dovecot/solr-schema-7.7.0.xml
-rw-r--r-- 1 root root 2.9K Dec 3 06:48
/usr/share/doc/dovecot/solr-schema.xml
is tested only for Solr 7.7.0
https://doc.dovecot.org/configuration_manual/fts/solr/
"The steps described in this page are tested for Solr 7.7.0. For
other versions, this these steps may need to be adjusted."
which, per solr docs
https://solr.apache.org/downloads.html
About versions and support
Version Description
9.x Current major version for feature
releases (STABLE)
8.11.x Previous major version may sometimes
receive critical bugfix releases
10 Next major version, yet to be released
(UNSTABLE)
<8.11 All older versions are End Of Life (EOL)
is EOL'd and unsupported.
In the dovecot 7.7.0 schema, FastLRUCache/LRUCache are used as the caching
class(es),
grep class=.*LRU /usr/share/doc/dovecot/solr-config-7.7.0.xml
<filterCache class="solr.FastLRUCache"
<queryResultCache class="solr.LRUCache"
<documentCache class="solr.LRUCache"
class="solr.search.LRUCache"
For Solr 9,
cat CHANGES.txt
Upgrade Notes
---------------------
...
* SOLR-13817: Deprecate legacy SolrCache implementations. Users
are encouraged to transition their
configurations to use org.apache.solr.search.CaffeineCache
instead. (ab)
running solr9 + dovecot-fts-solr search, based on the 7.7.0 schemas, results in
errors, failed scan & search.
Modifying the config to use CaffeineCache
cp solr-config-7.7.0.xml solr-config-9.0.0.xml
perl -pi -e '\
s|solr.FastLRUCache|solr.CaffeineCache|g; \
s|solr.LRUCache|solr.CaffeineCache|g; \
s|solr.search.LRUCache|solr.search.CaffeineCache|g;' \
solr-config-9.0.0.xml
appears to do the trick.
Atm, indexing & search -- both manually triggered, and on delivery receipt to
Dovecot store -- is working with no errors (yet).
I've not tested exhaustively yet, & don't know if this Cache class change in the
schema is both necessary & sufficient for dovecot-fts-solr search use with solr
9.0.0
Given that for Solr
"<8.11 All older versions are End Of Life (EOL)"
it'd be useful for Dovecot to 'retest' for current, not-EOL'd Solr, and
publish/package compatible schemas accordingly.
