map reduce on multiple buckets

Alex Moore amoore at
Thu Jan 28 11:29:46 EST 2016

Hi Eugene,

MR is limited to one bucket for inputs, and the Solr inputs to a map phase
have this restriction too.

How many buckets are you trying to MR across, and also what type of MR
operation are you trying to do? There may be another way to get around this


On Thu, Jan 28, 2016 at 8:10 AM, Eugene Shubin <ev.shuba at> wrote:

> Is it possible to run mapreduce job on two or more buckets?
> I see from documentation that it might be possible if I specify inputs as
> list of {bucket, key} pairs,
> although list of secondary index inputs causes an error:
> riakc_pb_socket:mapred(P, [
>     {index, Bucket1, Index1, From, To},
>     {index, Bucket2, Index2, From, To}
>   ], ...
>  {error,<<"{inputs,{\"Inputs target tuples must be {B,K} or
> {{B,K},KeyData}:\",\n
> Is it possible using Solr (riak search) indexes?
> Evgenii Shubin
> _______________________________________________
> riak-users mailing list
> riak-users at
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