Counting the number of items in a bucket

Stephen Bennett steve at bennettweb.org
Tue Nov 22 08:48:28 EST 2011


Thanks for that. I've tried to run this across my cluster but it just
returns an error message. Do I need to include a key filter as well?

  An error occurred parsing the "inputs" field.
  Key filter expression missing filter list.


On 22 November 2011 08:42, Fyodor Yarochkin <fyodor.y at armorize.com> wrote:

> You can try to limit input by particular subset of ranges, if that
> helps. Here's my count m-r snippet:
>
> {
>   "inputs":{
>       "bucket":"data",
>       "index":"numero_int",
>       "start":0,
>       "end":1212
>   },
>   "query":[
>    {"map":
> {"language":"erlang","module":"riak_kv_mapreduce","function":"map_object_value","arg":"filter_notfound"}
>    },
>       {"reduce": {"language":"erlang",
>
> "module":"riak_kv_mapreduce","function":"reduce_count_inputs","arg":"filter_notfound"}}
>
>    ], "timeout": 9000
> }
>
> hope it helps,
> -fyodor
>
>
>
> On Tue, Nov 22, 2011 at 3:26 AM, Stephen Bennett <steve at bennettweb.org>
> wrote:
> > I have a bucket which contains images refernced by a key which is made up
> > from a guid. I have a number of servers in my cluster and my bucket is
> set
> > up to store 3 versions of every item in the bucket across the servers in
> the
> > cluster. I'd like to understand a little bit more about how my cluster is
> > performing in terms of data storage. I can find out how much space each
> > bitcask is currently taking up on each server, but I'd like to compare
> > reference this against the number of unique keys that are being stored in
> > the system.
> >
> > I've tried to use map-reduce methods using the erlang methods defined in
> the
> > riak_kv_mapreduce, calling them against the HTTP interface but my queries
> > are timing out. I've tried to extend the timeout, but it's still timing
> out.
> >
> > What's the most efficient way to find out how many keys exist in a
> > particular bucket?
> > _______________________________________________
> > riak-users mailing list
> > riak-users at lists.basho.com
> > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
> >
> >
>
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