Oops! I'm so careless that haven't noticed it. This is really a rookie question. Thanks for your answer.
2009/8/28 Jothi Padmanabhan <[email protected]> > Reduce Task creates a ReduceCopier object and invokes fetchOutput method on > this object to start the fetch process. > > fetchOutputs internally launches several MapOutputCopier threads to do the > fetching and each of these thread do the copyOutput. > > Jothi > > > On 8/28/09 9:06 AM, "Inifok Song" <[email protected]> wrote: > > > Hello all, > > > > In class ReduceTask, there are a lot of methods to deal with fetching > > intermediate output. And I think copyOutput() and fetchOutputs() are the > > most important. However, they are invoked by different methods. I wonder > > know whether they deal with the same thing? What's the difference between > > them? > > > > Thank you. > > > > Inifok > >
