Sometimes its network issue, reducers are not able to find hostnames or IPs of the other machines. Make sure your /etc/hosts entries and hostnames are correct.
Regards, Praveenesh On Tue, Nov 20, 2012 at 10:46 PM, Harsh J <[email protected]> wrote: > Your mappers are failing (possibly a user-side error or an > environmental one) and are being reattempted by the framework (default > behavior, attempts 4 times to avoid transient failure scenario). > > Visit your job's logs in the JobTracker web UI, to find more > information on why your tasks fail. > > On Tue, Nov 20, 2012 at 10:22 PM, jamal sasha <[email protected]> > wrote: > > > > > > > > I am not sure whats happening, but I wrote a simple mapper and reducer > > script. > > > > > > > > And I am testing it against a small dataset (like few lines long). > > > > > > > > For some reason reducer is just not starting.. and mapper is executing > again > > and again? > > > > > > > > 12/11/20 09:21:18 INFO streaming.StreamJob: map 0% reduce 0% > > > > 12/11/20 09:22:05 INFO streaming.StreamJob: map 50% reduce 0% > > > > 12/11/20 09:22:10 INFO streaming.StreamJob: map 100% reduce 0% > > > > 12/11/20 09:32:05 INFO streaming.StreamJob: map 50% reduce 0% > > > > 12/11/20 09:32:11 INFO streaming.StreamJob: map 0% reduce 0% > > > > 12/11/20 09:32:20 INFO streaming.StreamJob: map 50% reduce 0% > > > > 12/11/20 09:32:31 INFO streaming.StreamJob: map 100% reduce 0% > > > > 12/11/20 09:42:20 INFO streaming.StreamJob: map 50% reduce 0% > > > > 12/11/20 09:42:31 INFO streaming.StreamJob: map 0% reduce 0% > > > > 12/11/20 09:42:32 INFO streaming.StreamJob: map 50% reduce 0% > > > > 12/11/20 09:42:50 INFO streaming.StreamJob: map 100% reduce 0% > > > > > > > > > > > > Let me know if you want the code also. > > > > Any clues of where I am going wrong? > > > > Thanks > > > > > > > > > > > > > > > > -- > Harsh J >
