I would have suspected that an MR job where you supply a Bucket, Key pair would be just as fast as a Get request. Shows what I know. --- Jeremiah Peschka Founder, Brent Ozar PLF, LLC
On Jul 29, 2011, at 1:37 AM, Antonio Rohman Fernandez wrote: > MapReduce ( or a simply Map ) gets really slow when database has a > significant amount of data ( or distributed over several servers ). Get > instead is always faster as Riak doesn't have to search for the key ( you > tell Riak exactly where to GET the data in your url ) > > Rohman > > On Thu, 28 Jul 2011 23:43:06 +0400, [email protected] wrote: > >> Hi, >> >> (I looked at various places for the information, however I could not >> find anything that would answer the question. It's not completely ruled >> out that not all places were checked though :)) >> >> I use PB erlang interface to access the database. Given a bucket name >> and a key, the value can easily be extracted using: >> >> {ok, Object} = riakc_pb_socket:get(Conn, Bucket, Key), >> Value = riakc_obj:get_value(Object) >> >> Alternatively, a mapred (actually, just map) request could be issued: >> >> {ok, [{_, Value}]} = riakc_pb_socket:mapred(Conn, [ >> {Bucket, Key} >> ], [ >> {map, {modfun, riak_kv, map_object_value}, none, true} >> ]) >> >> I would expect that the result is the same while in the second case, the >> amount of data transferred to the client is smaller (which might be good >> for certain situations). >> >> So the [open] question is: are there any reasons for using the first >> approach over the second? >> >> -- >> Misha >> > -- > > Antonio Rohman Fernandez > CEO, Founder & Lead Engineer > [email protected] Projects > MaruBatsu.es > PupCloud.com > Wedding Album > _______________________________________________ > riak-users mailing list > [email protected] > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com _______________________________________________ riak-users mailing list [email protected] http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
