Hi, I'm working on an application where I am storing an erlang external term format in riak. The entire structure gets updated at once, but I'd like to see what is changing, so I have something like this (in pseudo code).
NewObject = construct_new(...), OldObject = riak_pb_socket:get(...), ok = riak_pb_socket:put (.., NewObject), compare (OldObject, NewObject), The idea being that I am updating the object everytime, but I would like to have a general idea what has changed. So I was wondering if there are any options for put to return the previous value? That would allow me to remove the call to get and simply do something like. NewObject = construct_new(...), OldObject = riak_pb_socket:put (.., NewObject), compare (OldObject, NewObject), Now I assume what I get back would depend a lot on what the w value is, but in most cases, I tend to use the defaults. Also, I would think the old values could be returned as a list in some cases where there was disagreement. Anyway, would something like this be hard to implement in riak itself (it's sort of a specialized use case, but I could see it being useful in cases like mine where you always want a put to succeed, but you might want to check what changed for tracking reasons, and I do understand that you won't be absolutely accurate all the time, but I mostly am looking for something scalable and mostly accurate). -Anthony -- ------------------------------------------------------------------------ Anthony Molinaro <antho...@alumni.caltech.edu> _______________________________________________ riak-users mailing list riak-users@lists.basho.com http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
