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From Brian Candler <B.Cand...@pobox.com>
Subject Re: Reduce limitations
Date Thu, 28 May 2009 19:37:29 GMT
On Tue, May 26, 2009 at 12:21:10PM +0100, Michael Stillwell wrote:
> On Sat, Apr 25, 2009 at 10:39 PM, Brian Candler <B.Candler@pobox.com> wrote:
> > Has anyone found a clear definition of the limitations of reduce functions,
> > in terms of how large the reduced data may be?
> 
> In http://mail-archives.apache.org/mod_mbox/couchdb-user/200808.mbox/%3cEC4EAF59-78BA-4238-9827-B3561E3DC183@apache.org%3e,
> Damian says:
> 
> "the size of the reduce value can be logarithmic with respect to the rows"

Which doesn't give any guidance as to the absolute maximum size of the
reduce value, only how big it can get in relation to the number of rows,
e.g.

   max_reduce_object_size = k . ln(number of rows reduced)

for some unknown k. Or is it ln(total size of rows reduced)?

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