And it's a bit ironic that having data spread over more servers results in slower performance. Usually more servers = greater performance. ...black is white, up is down... *
<http://www.loomlearning.com/> Jonathan Langevin Systems Administrator Loom Inc. Wilmington, NC: (910) 241-0433 - jlange...@loomlearning.com - www.loomlearning.com - Skype: intel352 * On Fri, Jul 29, 2011 at 10:27 AM, Jeremiah Peschka < jeremiah.pesc...@gmail.com> wrote: > 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, m...@mawhrin.net 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 > > roh...@mahalostudio.com Projects > > MaruBatsu.es > > PupCloud.com > > Wedding Album > > _______________________________________________ > > riak-users mailing list > > riak-users@lists.basho.com > > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com > > > _______________________________________________ > riak-users mailing list > riak-users@lists.basho.com > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com >
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