On 3/2/2021 3:47 PM, Stephen Lewis Bianamara wrote:
I'm investigating a weird behavior I've observed in the admin page for
caffeine cache metrics. It looks to me like on the older caches, warm-up
queries were not counted toward hit/miss ratios, which of course makes
sense, but on Caffeine cache it looks like they are. I'm using solr 8.3.
Obviously this makes measuring its true impact a little tough. Is this by
any chance a known issue and already fixed in later versions?
The earlier cache implementations are entirely native to Solr -- all the
source code is include in the Solr codebase.
Caffeine is a third-party cache implementation that has been integrated
into Solr. Some of the metrics might come directly from Caffeine, not
Solr code.
I would expect warming queries to be counted on any of the cache
implementations. One of the reasons that the warming capability exists
is to pre-populate the caches before actual queries begin. If warming
queries are somehow excluded, then the cache metrics would not be correct.
I looked into the code and did not find anything that would keep warming
queries from affecting stats. But it is always possible that I just
didn't know what to look for.
In the master branch (Solr 9.0), CaffeineCache is currently the only
implementation available.
Thanks,
Shawn
