Thanks for the info. As a note, I found that the javascript function was
having trouble return binary values.
I followed your suggestion and am now using the following function. (Here
for others.)
-module(multiget).
-export([key_value/3]).
key_value({error, notfound}, _KD, _) ->
none;
key_value(RiakObject, _KD, _) ->
[riak_object:bucket(RiakObject),riak_object:key(RiakObject),
riak_object:get_value(RiakObject)].
Thanks again for your help. I haven't done performance tests yet but am
hoping that this is more performant than 20 individual gets.
I must say that I'm still quite surprised that a key value store of Riak's
caliber doesn't have a native binary multiget within the core pbc api.
Jacques
On Thu, Jun 16, 2011 at 5:03 AM, Russell Brown <[email protected]> wrote:
> Hi Jaques,
> Sorry for the slow reply. I think this one just slipped by me.
>
> Ok. answers inline below:
>
> On 14 Jun 2011, at 18:26, Jacques wrote:
>
> Does anybody have any insight on my questions below?
>
> Thanks,
> Jacques
>
>
> On Tue, Jun 7, 2011 at 6:12 PM, Jacques <[email protected]> wrote:
>
>> I've been working on this. I have it working with an anonymous javascript
>> function. I was hoping to move it to using the "map_object_value" built-in
>> erlang function. However, when I attempt to use this function, I get
>> failures if any of my keys don't exist. Is there a way to construct my map
>> phase so that it gracefully handles not founds and just returns what it
>> finds?
>
>
> Yes. riak_kv_mapreduce:map_object_value accepts an arg value of
> either "filter_notfound", "include_notfound" or "include_keydata", so your
> not found values can be omitted by passing "filter_notfound" as the arg
> value for the map phase (instead of ATOM_NONE in your construction.)
>
>
>> Also, using this function, is there a way to return the bucket and key
>> names?
>>
>
> No not using riak_kv_mapreduce:map_object_value, you could use
> riak_kv_mapreduce:map_identity to get the whole riak object (meta data, key
> and value) or just write your own map reduce function that returns the data
> you want (and can filter out the not founds just like map_object_value)
>
> Or can one assume the response order is identical to the order of inputs?
>>
>
> No.
>
> deletia
>
>
> Cheers
>
> Russell
>
>
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