incubator-couchdb-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Randall Leeds <randall.le...@gmail.com>
Subject Re: distributed map-reduce queries
Date Tue, 21 Sep 2010 17:23:33 GMT
On Tue, Sep 21, 2010 at 18:19, Christopher Bare
<cbare@systemsbiology.org> wrote:
>
> I only vaguely understand the incremental indexing aspect of Couch,
> and welcome any comments about other differences between Couch's
> map-reduce and other forms; biting or not. There's lots of cool
> engineering to explore.

This means that the index is persistent. A view is only calculated
once even if you query it multiple times. When new documents are added
those are added to the index without recalculating the entire M/R.

This also means that your M/R code must be deterministic and cannot
involve query-time user variables.

-Randall

Mime
View raw message