Jeff Wartes created SOLR-8171:
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Summary: Facet query filterCache usage is psychic
Key: SOLR-8171
URL: https://issues.apache.org/jira/browse/SOLR-8171
Project: Solr
Issue Type: Bug
Components: faceting
Affects Versions: 5.3
Reporter: Jeff Wartes
>From this thread:
https://mail-archives.apache.org/mod_mbox/lucene-solr-user/201510.mbox/%3cd23998fc.6fa32%[email protected]%3E
There's really a few points here, which may be different issues:
1. Either facet queries aren't using the filterCache correctly, or the stats
don't reflect actual usage. (Or it's psychic.) Somehow, "lookups" only ever
gets incremented when "hits" does, yielding a 100% cache hit rate at all times.
2. Facet queries appear to use the filterCache as a queryResultCache. Meaning,
only identical facet queries cause filterCache "hits" to increase.
Interestingly, disabling the queryResultCache still results in facet queries
doing *inserts* into the filterCache, but no longer allows stats-reported
*usage* of those entries.
If the stats are right and facet queries *aren't* actually using the
filterCache for anything except possible future searches, then there should be
a mechanism for disabling facet query filterCache usage to avoid filling the
filterCache with low usage queries. Honestly though, that sounds more like
something for the queryResultCache than filterCache anyway.
If facet queries *are* using the filterCache for performance within a single
query, I'd suggest that facet queries should have their own named cache
specifically for that use, rather than try to share a task load (size,
regenerator) with the generic filterCache.
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