This is interesting. Is the reduce trivial here? (if so, then and shuffling isn't the problem and you may have demonstrated this with your no output version)
WHat happens if you increase the number of maps to 5x the number of nodes? On Sat, Jul 18, 2009 at 11:11 AM, Deneche A. Hakim (JIRA) <j...@apache.org>wrote: > It looks like building a single tree in a sequential manner is 2x faster > than building the same tree with the cluster !!! I don't have a lot of > experience with clusters, is it normal ??? may be 10 instances is just too > small to get a good speedup, or may be there is a bug hiding somewhere (I > can hear it walking in the code when the moon...) > -- Ted Dunning, CTO DeepDyve
