[jira] [Created] (SOLR-16546) Faceting puts an entry for each q into the filterCache

["Andy Lester (Jira)" <ji...@apache.org>]

Andy Lester created SOLR-16546:
----------------------------------

             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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