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From Jan Lehnardt <...@apache.org>
Subject Re: scaling dimensions in reduce
Date Sun, 13 Dec 2009 16:52:27 GMT
Hi Matteo,

On 10 Dec 2009, at 11:53, Matteo Caprari wrote:

> Interesting.
> 
> Let's say I'd like to implement that feature. Where would you start?
> Is there a document like "start hacking couchdb"?

That's awesome! There are some docs on the wiki:

  http://wiki.apache.org/couchdb/Development

They should do for an intro. If you get stuck, the #couchdb channel
on irc.freenode.net is a good place to get help. You should also
subscribe to the dev@ mailing list, if you haven't already, to
discuss the direction of your patch.

Please write if you have any more questions.

Cheers
Jan
--


> 
> -teo
> 
> On Thu, Dec 10, 2009 at 7:44 PM, Chris Anderson <jchris@apache.org> wrote:
>> On Tue, Dec 8, 2009 at 1:11 PM, Matteo Caprari <matteo.caprari@gmail.com> wrote:
>>> Hi Kosta.
>>> 
>>> I'm trying to output an svg chart using a _list function, so no client
>>> is consuming the view directly.
>>> 
>>> I could find the max and scale the data inside the list, but that
>>> would consume quite a lot of memory for big datasets,
>>> unless it was possibe to reset the iterator...
>>> 
>> 
>> There are a few use cases which could benefit from the ability to
>> specify an array of view queries in the POST body. By querying the
>> reduce, and then the non-reduce, you could do this in a list. But
>> first we need that feature. It would look like a more generalized form
>> of this:
>> 
>> http://issues.apache.org/jira/browse/COUCHDB-523
>> 
>>> -teo
>>> 
>>> On Tue, Dec 8, 2009 at 9:03 PM,  <kosta@fillibach.de> wrote:
>>>> Hi!
>>>> 
>>>>> To scale the values I'need to know the maximum point,  and I think
>>>>> it'not possible to do that with map/reduce.
>>>> 
>>>> You can find the maximum point using map/reduce. The division of all point
>>>> must then be done manually given that point, e.g. in a view. Of course,
>>>> doing it this way has problems with atomicity.
>>>> 
>>>> HTH,
>>>> Kosta
>>>> 
>>>> 
>>>> 
>>> 
>>> 
>>> 
>>> --
>>> :Matteo Caprari
>>> matteo.caprari@gmail.com
>>> 
>> 
>> 
>> 
>> --
>> Chris Anderson
>> http://jchrisa.net
>> http://couch.io
>> 
> 
> 
> 
> -- 
> :Matteo Caprari
> matteo.caprari@gmail.com
> 


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