Best practices for updates

Dan Reverri dan at
Mon Nov 29 13:39:56 EST 2010

Hi Dan,

Sorry for not getting back to you sooner. There is no multi-set feature in
Riak; each object would need to be updated with a separate request.

While it is possible to modify Riak objects from within an Erlang map
function, the map/reduce functionality was not intended for this type of
operation. I don't see any reason a map phase couldn't be used for a
multi-set but this is not an area that has been tested or verified.

Thank you,

Daniel Reverri
Developer Advocate
Basho Technologies, Inc.
dan at

On Thu, Nov 18, 2010 at 1:34 PM, Daniel Langevin <
dan.langevin at> wrote:

> We are considering using Riak and I am looking for some advice on best
> practices for updating a large number of records.  Our problem is that we
> have a large number of unique sets of results, each of which represent a
> schedule for multiple people on a particular day or set of days.
> For example, we would have  a result set for Mondays from 11/01 - 11/28 and
> another for 11/29 and then a third on Mondays from 11/30 onwards if one
> person's schedule was edited for 11/29.
> So when a person's schedule changes, we need to update the related result
> sets.  The issue is that there are likely to be a large number of result
> sets that need to be updated for each change to a person's schedule and I
> would like to process them in parallel.  From what I have seen, the only way
> to do this is to write a MapReduce (or map really I guess) function in
> Erlang, though the forum thread I found seemed to discourage this approach.
> Is that correct or am I missing something?  This seems like a relatively
> common use-case for sharded data, so I am hoping that Riak offers a good
> solution for us.
> Thanks in advance,
> Dan Langevin
> _______________________________________________
> riak-users mailing list
> riak-users at
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <>

More information about the riak-users mailing list