dovecot-fts-solr Solr9 support

[PGNet Dev]

On 5/17/22 12:17 PM, Shawn Heisey wrote:
> I had made the change to CaffeineCache quite a while back.

iiuc, solr8x still has support for *LRUCache classes, as well as CaffeineCache.

in my 8x installs, i'd simply never noticed related search problems ... only after my 9x install, with the full deprecation of legacy cache(s), did I notice these

...
/var/log/solr/solr.log.6:2022-05-17 10:08:09.402 ERROR (qtp1165791284-17) [ x:dovecot] o.a.s.s.CacheConfig Error instantiating cache => org.apache.solr.common.SolrException:  Error loading class 'solr.search.LRUCache'
/var/log/solr/solr.log.6:org.apache.solr.common.SolrException:  Error loading class 'solr.search.LRUCache'
/var/log/solr/solr.log.6:Caused by: java.lang.ClassNotFoundException: solr.search.LRUCache
/var/log/solr/solr.log.6:2022-05-17 10:09:13.534 ERROR (qtp1165791284-23) [ x:dovecot] o.a.s.s.CacheConfig Error instantiating cache => org.apache.solr.common.SolrException:  Error loading class 'solr.LRUCache'
/var/log/solr/solr.log.6:org.apache.solr.common.SolrException:  Error loading class 'solr.LRUCache'
/var/log/solr/solr.log.6:Caused by: java.lang.ClassNotFoundException: solr.LRUCache
/var/log/solr/solr.log.6:2022-05-17 10:09:13.556 ERROR (qtp1165791284-23) [ x:dovecot] o.a.s.s.CacheConfig Error instantiating cache => org.apache.solr.common.SolrException:  Error loading class 'solr.FastLRUCache'
/var/log/solr/solr.log.6:org.apache.solr.common.SolrException:  Error loading class 'solr.FastLRUCache'
/var/log/solr/solr.log.6:Caused by: java.lang.ClassNotFoundException: solr.FastLRUCache
...

> I can come up with a new config that should work in 8.x, 9.x, and the current dev branch by almost anyone.

CaffeineCache  _should_ be a solution for both series.
I'm just starting to do a bit of testing, but so far, indexing/search with Caffeine seems quicker, at least.
I do not yet know in which case(s) CaffeineCache is _not_ an appropriate solution.

> I should probably see if I can write some end to end instructions for installing Solr and configuring dovecot to use it.

Having something well-vetted and doc'd will be useful.


> Something that is missing from the current instructions is how to initiate a FULL reindex of all data in the dovecot install.

Beyond looping over each $acct

  doveadm fts rescan -u ${acct}
  doveadm index      -u ${acct} -q '*'

?