I normally find the intermediate stage of copying data to the reducers from the mappers to be a significant step - but that's not over the best quality switches...
The mappers and reducers work on the same boxes, close to the data. On Wed, 2008-10-01 at 10:59 -0700, Alex Loddengaard wrote: > > It really depends on your job I think. Often reduce steps can be the > bottleneck if you want a single output file (one reducer). > > Hope this helps. > > Alex
