i face the same issue but after sumtime when i balanced the cluster the jobs started running fine,
On Wed, Jan 25, 2012 at 3:34 PM, praveenesh kumar <praveen...@gmail.com>wrote: > Hey, > > Can anyone explain me what is reduce > copy phase in the reducer section ? > The (K,List(V)), is passed to the reducer. Is reduce > copy representing > copying of K,List(V) on the reducer from all mappers ? > > I am monitoring my jobs on the cluster, using Jobtracker url. > I am seeing for most of my reducing jobs, something like this : > > task_201201250352_0001_r_000000 31.05% reduce > copy (395 of 424 at 0.00 > MB/s) > 25-Jan-2012 03:54:06 > > task_201201250352_0001_r_000001 30.73% reduce > copy (391 of 424 at 0.00 > MB/s) > 25-Jan-2012 03:54:06 > > task_201201250352_0001_r_000002 30.89% reduce > copy (393 of 424 at 0.00 > MB/s) > 25-Jan-2012 03:54:06 > > > ............................ > > Can anyone explain me why the speed is 0.00 MB/s. Job is running fine. > Is it because this reduce > copy is happening on the same machine. > > Thanks, > Praveenesh >
