See this .. hope this answers your question . http://developer.yahoo.com/hadoop/tutorial/module4.html#tips
On Sun, Jun 28, 2009 at 5:28 PM, bonito <bonito.pe...@gmail.com> wrote: > > Hello! > I am a new hadoop user and my question may sound naive.. > However, I would like to ask if there is a way to combine the results of > two > mpa tasks that may "run" simultaneously. > I use the MultipleInput class and thus I have two different mappers. > I want the result/output of the one map (associated with one input file) to > be used in the process of the second map (associated with the second input > file). > I have thought of storing the map1 output in the hdfs and retrieving it > using the map2. > However, I have no clue whether this is possible. I mean...what about > time-executing issues? map2 has to wait until map1 is completed... > > The thought of executing them in a serial manner is not the one I really > want... > > Any suggestion would be appreciated. > Thank you in advance :) > > -- > View this message in context: > http://www.nabble.com/combine-two-map-tasks-tp24240928p24240928.html > Sent from the Hadoop core-user mailing list archive at Nabble.com. > >
