Well... the limitation of DocValues is that it cannot handle more than one value per document (which UnInvertedField can).
Hopefully we can fix that at some point :) Mike McCandless http://blog.mikemccandless.com On Fri, Oct 21, 2011 at 7:50 AM, Simon Willnauer <simon.willna...@googlemail.com> wrote: > In trunk we have a feature called IndexDocValues which basically > creates the uninverted structure at index time. You can then simply > suck that into memory or even access it on disk directly > (RandomAccess). Even if I can't help you right now this is certainly > going to help you here. There is no need to uninvert at all anymore in > lucene 4.0 > > simon > > On Wed, Oct 19, 2011 at 8:05 PM, Michael Ryan <mr...@moreover.com> wrote: >> I was wondering if anyone has any ideas for making UnInvertedField.uninvert() >> faster, or other alternatives for generating facets quickly. >> >> The vast majority of the CPU time for our Solr instances is spent generating >> UnInvertedFields after each commit. Here's an example of one of our slower >> fields: >> >> [2011-10-19 17:46:01,055] INFO125974[pool-1-thread-1] - (SolrCore:440) - >> UnInverted multi-valued field >> {field=authorCS,memSize=38063628,tindexSize=422652, >> time=15610,phase1=15584,nTerms=1558514,bigTerms=0,termInstances=4510674,uses=0} >> >> That is from an index with approximately 8 million documents. After each >> commit, >> it takes on average about 90 seconds to uninvert all the fields that we >> facet on. >> >> Any ideas at all would be greatly appreciated. >> >> -Michael >> >
