Use a reduce phase instead, which doesn't force loading of the objects. A
simple identity reduce should do what you want: function(values,arg){ return
values; }
Sean Cribbs <[email protected]>
Developer Advocate
Basho Technologies, Inc.
http://basho.com/
On Jan 24, 2011, at 7:43 PM, Gordon Tillman wrote:
> Greetings All,
>
> I have a use case for our app where I need to fetch a list of keys that match
> some pattern and was hoping to be able to use key filters for that.
>
> In my test I defined a key filter for the input phase of mapred and then
> defined just a single map phase that returns the object key. But there is
> considerable overhead with that map phase because (I'm assuming this part)
> Riak is having to load each object to provide the necessary inputs to the map
> function.
>
> Is there a way to do this without Riak having to actually load the objects?
>
> Many thanks,
>
> --gordon
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