I have 6 reducers, Nick, still no luck.. 2009/3/2 Nick Cen <cenyo...@gmail.com>
> how many reducer do you have? You should make this value larger then 1 to > make mapper and reducer run concurrently. You can set this value from > JobConf.*setNumReduceTasks*(). > > > 2009/3/2 Rasit OZDAS <rasitoz...@gmail.com> > > > Hi! > > > > Whatever code I run on hadoop, reduce starts a few seconds after map > > finishes. > > And worse, when I run 10 jobs parallely (using threads and sending one > > after > > another) > > all maps finish sequentially, then after 8-10 seconds reduces start. > > I use reducer also as combiner, my cluster has 6 machines, namenode and > > jobtracker run also as slaves. > > There were 44 maps and 6 reduces in the last example, I never tried a > > bigger > > job. > > > > What can the problem be? I've read somewhere that this is not the normal > > behaviour. > > Replication factor is 3. > > Thank you in advance for any pointers. > > > > Rasit > > > > > > -- > http://daily.appspot.com/food/ > -- M. Raşit ÖZDAŞ
