Can we add it back with a parameter at least ? Bill Bell Sent from mobile
> On Sep 24, 2015, at 8:58 AM, Yonik Seeley <ysee...@gmail.com> wrote: > >> On Mon, Sep 21, 2015 at 8:09 AM, Uwe Reh <r...@hebis.uni-frankfurt.de> wrote: >> our bibliographic index (~20M entries) runs fine with Solr 4.10.3 >> With Solr 5.3 faceted searching is constantly incredibly slow (~ 20 seconds) > [...] >> >> The 'fieldValueCache' seems to be unused (no inserts nor lookups) in Solr >> 5.3. In Solr 4.10 the 'fieldValueCache' is in heavy use with a >> cumulative_hitratio of 1. > > > Indeed. Use of the fieldValueCache (UnInvertedField) was secretly > removed as part of LUCENE-5666, causing these performance regressions. > > This code had been evolved over years to be very fast for specific use > cases. No one facet algorithm is going to be optimal for everyone, so > it's important we have multiple. But use of the UnInvertedField was > removed without any notification or discussion whatsoever (and > obviously no benchmarking), and was only discovered later by Solr devs > in SOLR-7190 that it was essentially dead code. > > > When I brought back my "JSON Facet API" work to Solr (which was based > on 4.10.x) it came with a heavily modified version of UnInvertedField > that is available via the JSON Facet API. It might currently work > better for your usecase. > > On your normal (non-docValues) index, you can try something like the > following to see what the performance would be: > > $ curl http://yxz/solr/hebis/query -d 'q=darwin& > json.facet={ > authors : { type:terms, field:author_facet, limit:30 }, > material_access : { type:terms, field:material_access, limit:30 }, > material_brief : { type:terms, field:material_brief, limit:30 }, > rvk : { type:terms, field:rvk_facet, limit:30 }, > lang : { type:terms, field:language, limit:30 }, > dept : { type:terms, field:department_3, limit:30 } > }' > > There were other changes in LUCENE-5666 that will probably slow down > faceting on the single valued fields as well (so this may still be a > little slower than 4.10.x), but hopefully it would be more > competitive. > > -Yonik
