So you are processing a graph looking for a specific node with a given value. The special key is about all I can think of or if you don't need the rest of the graph you can look at just outputting the nodes that you care about. If you are doing graph processing you might want to look at http://incubator.apache.org/giraph/ Even if you don't use their tool they might be able to answer your question a lot better then I can.
--Bobby Evans On 11/6/11 10:21 AM, "Yaron Gonen" <yaron.go...@gmail.com> wrote: Hi, Suppose I have chained M/R jobs that traverse a graph and look for nodes with a specific value. Every time a Map encounters that value, I'd like to keep that node in the final result. I can of course save it with a special key and use a condition in the Reducer, but is there a more formal or elegant way? thanks, Yaron
