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From Robert Newson <rnew...@apache.org>
Subject Re: HTTP request with CouchDB
Date Wed, 13 Nov 2013 15:59:05 GMT
Benoit, the code that makes an http call then uses the result in an
emit() call, which only makes sense as part of a map function.

B.


On 13 November 2013 15:57, Benoit Chesneau <bchesneau@gmail.com> wrote:
> On Wed, Nov 13, 2013 at 4:50 PM, Robert Newson <rnewson@apache.org> wrote:
>
>> what Jens said. We prevent this deliberately. Crowbar it back in at
>> your own risk.
>>
>> B.
>>
>
> The code pasted in the initial mail isn't about map/reduce but a show. Imo
> if the user want to take more risk I don't see why not if it's feasible
> technically without introducing any changes to the defaults ;) Especially
> in shows and list. There are a lot of good reason to do that. we could even
> provides some limitation on what could be cal there if i red the action.js
> from 2008 well.
>
> - benoit
>
>
>
>>
>>
>> On 13 November 2013 15:45, Jens Alfke <jens@couchbase.com> wrote:
>> >
>> > On Nov 13, 2013, at 4:48 AM, Hank Knight <hknight555@gmail.com> wrote:
>> >
>> >> function(doc, req) {
>> >>    var http = new XMLHttpRequest();
>> >>    http.open( "GET", "http://www.w3schools.com/xml/note.xml", false );
>> >>    http.send( null );
>> >>    emit("xyz",http.responseText);
>> >> }
>> >
>> > Wait, is that supposed to be a map function? Whether or not this is
>> technically feasible, it’s an incorrect use of map/reduce.
>> >
>> > It’s critical that a map function be a ‘pure' function with no access to
>> outside state. That is, every time the function is called with the same
>> input, it must produce the same output. Otherwise you won’t get a
>> self-consistent index.
>> >
>> > —Jens
>>

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