On May 1, 2008, at 17:54, Krzysztof Kulewski wrote:
couch_query_servers.erl is working in such a way:
% send command and get a response.
prompt(Port, Json) ->
writeline(Port, cjson:encode(Json)),
read_json(Port).
so to obtain many tasks at once in this javascript (or whatever)
view server I have also to pass more than one request before actualy
reading the output. Then I can distribute the load in view server.
Am I right?
Yes you are. There are actually things that need to be changed
on CouchDB's side to let you do this. Sorry, if my statements
earlier were misleading :) Patches are welcome, too!
Cheers
Jan
--
Jan Lehnardt napisał(a):
Hello Krzysztof,
On May 1, 2008, at 00:52, Krzysztof Kulewski wrote:
Hello,
I have a question for which I couldn't find solution on docs
available online. Please help:
Lets suppose that I have one couchdb server storing text
documents. I want to do some map reduce on it. Map part take very
long time per one doc, so I want to distribute maps between 20
map servers (btw. maybe unreliable). And then somebody will do
the reduce part.
As I can see, "CouchDB delegates computation of Views to external
query servers." But I want to use 20 separate machines for doing
map part to obtain 20x speed-up.
How to distribute this map part? Is there any pretty solution out
of the box?
This is not yet possible out of the box. You could probably
achieve this by writing your own view server component
that distributes the map requests that CouchDB sends in. For a
reference view server see:
http://svn.apache.org/viewvc/incubator/couchdb/trunk/share/server/main.js?
revision=645661&view=markup You don't need to write it in
JavaScript (the couch.ini lets
you specify a daemon written in any language. The only
thing you need to make sure is that the interface to
CouchDB behaves the same as the original view server. Cheers
Jan
--
