Hi OJ! I'm just working through this myself at the moment as I'm trying to make the Java PB client behave the same way as the REST client .
On 28 Apr 2011, at 04:23, OJ Reeves wrote: > Hi everyone, > > I'm currently using Riak to store some user/account/oauth information and I > have a need to pull some data while link-walking using the Erlang PBC. > > I have read the post on the Basho blog about how to do link walking using the > REST API, and I can see that data for the individual nodes comes back as the > nodes are being walked (by specifying 1 at the end of the URI). > Unfortunately, after reading the docs, I can't see how to achieve the same > result using the PBC. The samples demonstrate how to get information from the > links using map/reduce, and I can see how I would use that information to hit > Riak again and ask for the content. > > So my question: Is this how link walking should work when using the PBC? Or > is there some way of getting the PBC to return the content at the same time > as doing the link walking? I asked yesterday and the answer I received was: no. > > In practice, what I have it a relationship between three entities (a, b and > c) that live in different buckets (A, B and C). a has a link to b, and b has > a link to c. What I want to do is walk from a to c while taking the following > information: > The value stored in a. > The key of b and, if b still exists in B, the value stored in b, otherwise > nothing/false/failure. > The key of c and an indication of whether c currently exists in C. > Currently I link walk and do each step manually and I was wondering if there > was a better or more optimal way of performing these actions. > At the moment the plan is running an initial m/r job for the link phases then making a second m/r job with all the intermediate results as inputs. So maximum 2 jobs is my target. I should think this is a common problem so if you come up with an optimal solution you'll make a few friends! How do you satisfy your requirement with the REST link walker? Specifically how do you get the value of *a* returned as part of the result? Cheers Russell > I hope I'm clear! > > Many thanks for any insights you may have. > Best regards > OJ > > -- > > OJ Reeves > http://buffered.io/ > _______________________________________________ > riak-users mailing list > riak-users@lists.basho.com > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
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