> On Nov 4, 2020, at 6:43 AM, uyilmaz <uyil...@vivaldi.net.INVALID> wrote: > > Hi, > > I heavily use streaming expressions and facets, or export large amounts of > data from Solr to Spark to make analyses. > > Please correct me if I know wrong: > > + requesting a non-docValues field in a response causes whole document to be > decompressed and read from disk
non-docValues fields don’t work at all for many stream spources, IIRC only the Topic Stream will work with stored values. The read/decompress/extract cycle would be unacceptable performance-wise for large data sets otherwise. > + streaming expressions and export handler requires every field read to have > docValues Pretty muche. > > - docValues increases index size, therefore memory requirement, stored only > uses disk space Yes. > - stored preserves order of multivalued fields Yes. > > It seems stored is only useful when I have a multivalued field that I care > about the index-time order of things, and since I will be using the export > handler, it will use docValues anyways and lose the order. Yes. > > So is there any case that I need stored=true? Not for export outside of the Topic Stream as above. stored=true is there for things like showing the user the original input and highlighting. > > Best, > ufuk > > -- > uyilmaz <uyil...@vivaldi.net>
