Just FYI, you don't need to stop the job, update the host, and retry. Just update the host while the job is running and it should retry and restart.
I had a similar issue with one of my node where the hosts file were not updated. After the updated it has automatically resume the work... JM 2012/11/21, praveenesh kumar <[email protected]>: > 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 >> >
