Hi Nick - While your reducers may be running concurrently with your mappers, they will not begin the "sort" and "reduce" steps until all map tasks have completed. Once they actually begin the reduce stage, they will have received all values for a given key.
cheers, -jw On Mon, Feb 23, 2009 at 1:00 AM, Nick Cen <[email protected]> wrote: > Hi all, > > If i have a bunch of value that have the same key, and i have more then one > reducer running, which guarantee both mapper and reducer are running > concurently. Will all these value be send to the reducer at the same time? > Thx > > -- > http://daily.appspot.com/food/ >
