I think an short and explicit discussion of using sequential GETs would be good to add to the docs in [1]. It'll be helpful to put the alternate option in the reader's head so they can evaluate as they're going through the article.
Cheers Matt On 9 April 2013 02:02, Jeremiah Peschka <jeremiah.pesc...@gmail.com> wrote: > I want to follow up on the recent "Map phase timeout" thread [2]. In part > out of curiosity and in part as a documentation clean up... Should the > documentation at [1] be changed? Specifically, the docs say MR should be > used: > > - *When you know the set of objects you want to MapReduce over (the > bucket-key pairs) *(emphasis added) > - When you want to return actual objects or pieces of the object – not > just the keys, as do Search & Secondary Indexes > - When you need utmost flexibility in querying your data. MapReduce > gives you full access to your object and lets you pick it apart any way you > want. > > It seems to me that a lot of discussions around MR in Riak come down to > "You're close but this isn't the best use case of MapReduce in Riak." Would > it be better, for the purposes of a general discussion, to say that > MapReduce is the appropriate paradigm when you want to: > > - manipulate a large amount of data inside the Riak cluster in bulk - > e.g. read all of my sales orders and where the version is 1, perform the > changes necessary to update the order format to version 2. > - burn a lot of I/O and make your admin sad > - move data from one bucket to another > - re-write an entire bucket so all data is indexed for 2i, search, etc > - Anything where the query can be resumed with no knowledge of state > at the time the last run of the query failed. > > Are there other use cases when MR is the better approach? > > [1]: > http://docs.basho.com/riak/latest/tutorials/querying/MapReduce/#When-to-Use-MapReduce > [2]: > http://riak.markmail.org/search/?q=#query:+page:1+mid:4o27v64qf55ejzwc+state:results > > --- > Jeremiah Peschka - Founder, Brent Ozar Unlimited > MCITP: SQL Server 2008, MVP > Cloudera Certified Developer for Apache Hadoop > > _______________________________________________ > riak-users mailing list > riak-users@lists.basho.com > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com > >
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