So should I use Memory format? With Regards Aman Tandon
On Thu, Jul 2, 2015 at 9:20 PM, Toke Eskildsen <t...@statsbiblioteket.dk> wrote: > Alessandro Benedetti <benedetti.ale...@gmail.com> wrote: > > DocValues is a strategy to store on the disk ( or in memory) the > > Un-inverted index for the field of interests. > > True. > > > This has been done to SPEED UP the faceting calculus using the "fc" > > algorithm, and improve the memory usage. > > Part of the reason was to speed up the _startup_ time for faceting. > > This is not the first time I read about people getting poorer > query-performance with DocValues. It does make sense: DocValues in the > index means that they compete with other files for disk caching and even > when they are fully cached, the UnInverted structure has a speed edge due > to being directly accessible as standard on-heap memory structures. > > The difference is likely to vary a great deal depending on concrete corpus > & hardware. > > - Toke Eskildsen >
