In general DocValues were built to support large scale random access use cases such as faceting and sorting. They have similar performance characteristics as the FieldCache. But unlike the FieldCache you can trade off memory and performance by selecting different DocValues formats.
Joel Bernstein http://joelsolr.blogspot.com/ On Mon, Jun 22, 2015 at 10:41 AM, Ishan Chattopadhyaya < ichattopadhy...@gmail.com> wrote: > Hi all, > I am looking to try out _version_ as a docvalue (SOLR-6337) as a precursor > to SOLR-5944. Towards that, I want the _version_ field to be > stored=indexed=false, docValues=true. > > Does someone know about the performance implications of retrieving the > _version_ as a docvalue, e.g. accessing docvalue vs. a stored field? Is > there any known inefficiency when using a docvalue (as opposed to a stored > field) due to random disk seeks, for example? > Regards, > Ishan >
