You could try forcing things to go through function queries (via pseudo-fields):
fl=field(id), field(myfield) If you're not requesting any stored fields, that *might* currently skip that step. -Yonik http://heliosearch.org - native off-heap filters and fieldcache for solr On Mon, Feb 24, 2014 at 9:58 PM, Gregg Donovan <gregg...@gmail.com> wrote: > We fetch a large number of documents -- 1000+ -- for each search. Each > request fetches only the uniqueKey or the uniqueKey plus one secondary > integer key. Despite this, we find that we spent a sizable amount of time > in SolrIndexSearcher#doc(int docId, Set<String> fields). Time is spent > fetching the two stored fields, LZ4 decoding, etc. > > I would love to be able to tell Solr to always fetch these two fields from > memory. We have them both in the fieldCache so we're already spending the > RAM. I've seen this asked previously [1], so it seems like a fairly common > need, especially for distributed search. Any ideas? > > A few possible ideas I had: > > --Check FieldCache.html#getCacheEntries() before going to stored fields. > --Give the documentCache config a list of fields it should load from the > fieldCache > > > Having an in-memory mapping from docId->uniqueKey has come up for us > before. We've used a custom SolrCache maintaining that mapping to quickly > filter over personalized collections. Maybe the uniqueKey should be more > optimized out of the box? Perhaps a custom "uniqueKey" codec that also > maintained the docId->uniqueKey mapping in memory? > > --Gregg > > [1] http://search-lucene.com/m/oCUKJ1heHUU1
