lucene-solr-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Aman Tandon <amantandon...@gmail.com>
Subject Re: DocValues: Which format is better Default or Memory?
Date Thu, 02 Jul 2015 16:43:56 GMT
So should I use Memory format?

With Regards
Aman Tandon

On Thu, Jul 2, 2015 at 9:20 PM, Toke Eskildsen <te@statsbiblioteket.dk>
wrote:

> Alessandro Benedetti <benedetti.alex85@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
>

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message