Andy Lester created SOLR-16546:
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Summary: Faceting puts an entry for each q into the filterCache
Key: SOLR-16546
URL: https://issues.apache.org/jira/browse/SOLR-16546
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Components: faceting
Affects Versions: 9.0
Reporter: Andy Lester
I noticed that I was getting far more entries in the filterCache than I was
expecting. All my app's FQs are driven by the app itself. There are only a
couple dozen FQs possible in our queries, but I'd be getting ~10K cache
ejections every hour. That didn't make any sense.
So I investigated and discovered that making a query using facets adds an entry
to the filterCache. Here's my demonstration.
The script show-results is this:
{{
curl -s "$URL/twit/admin/cache" | jq -S .queries
curl -s "$URL/admin/metrics" | jq
'.metrics."solr.core.twit"."CACHE.searcher.filterCache".inserts'
}}
The /admin/cache handler is Shawn Heisey's cache dumper he's working on in
ticket 15859.
{{
# Freshly started Solr. No cache entries.
$ ./show-results
{}
0
# Query on "alpha" with facets on.
$ curl -s $URL/twit/select?q=title:alpha&rows=0&facet=on&facet.field=grouping
# Now there is a filter cache entry.
$ ./show-results
{
"title:alpha": 0
}
1
# Query on "beta" with facets on. "beta" shows up in the cache.
$ curl -s $URL/twit/select?q=title:beta&rows=0&facet=on&facet.field=grouping
$ ./show-results
{
"title:alpha": 0,
"title:beta": 0
}
2
# Now query on "gamma" with facets OFF.
$ curl -s $URL/twit/select?q=title:gamma&rows=0&facet=off&facet.field=grouping
# The "gamma" does not show up in the filter cache.
$ ./show-results
{
"title:alpha": 0,
"title:beta": 0
}
2
# Now do same query on "gamma" with facets ON.
$ curl -s $URL/twit/select?q=title:gamma&rows=0&facet=on&facet.field=grouping
# The "gamma" shows up.
$ ./show-results
{
"title:alpha": 0,
"title:beta": 0,
"title:gamma": 0
}
3
}}
Is this correct behavior? Do I need to adjust my filterCache to allow for this?
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