Use MapReduce :) If map output: (key, value) Then reduce input becomes: (key, [iterator of values across all maps with (key, value)])
I believe this is very similar to the wordcount example, but minus the summing. For a given key, you get all the values that carry that key in the reducer. Have you tried to run a simple program to achieve this before asking? Or is something specifically not working? On Wed, Aug 3, 2011 at 9:20 AM, Jianxin Wang <wangjx...@gmail.com> wrote: > HI, > I hava many <key,value> pairs now, and want to get all different values > for each key, which way is efficient for this work. > > such as input : <1,2> <1,3> <1,4> <1,3> <2,1> <2,2> > output: <1,2/3/4> <2,1/2> > > Thanks! > > walter > -- Harsh J
