Right. Mutlivalued fields use fieldCache for faceting (as I remember) whereas single valued fields don't under some circumstances. See: http://wiki.apache.org/solr/SolrCaching#The_Lucene_FieldCache
Before your change, you were probably using the filterCache for what faceting you were doing. So yes, you're probably memory-constrained at this point. How much physical memory do you have anyway? Best Erick On Mon, Jan 30, 2012 at 12:10 PM, Milan Dobrota <mi...@milandobrota.com> wrote: > Hi, > > I have a Solr instance with 6M item index. It normally uses around 3G of > memory. I have suddenly started getting out of memory errors and increasing > the Xmx parameter to over 4G didn't fix the problem. It was just buying us > time. Inspecting the heap, I figured that 90% of memory is occupied by > FieldCache. Is this normal? We do very little sorting and no faceting. > > Is FieldCache ever supposed to get cleared? Can this be done through HTTP? > > Do we need more memory? If so, I don't understand why the minimal set of > changes we introduced (one multivalued field) would cause the memory to > drastically increase. > > The communication with the Solr instance is done via HTTP. > > Java version: > java version "1.6.0_17" > Java(TM) SE Runtime Environment (build 1.6.0_17-b04) > Java HotSpot(TM) 64-Bit Server VM (build 14.3-b01, mixed mode) > > Milan
