(Correct me if I'm wrong), but I think you can tell though the Hadoop Web UI -- it'll show a count of which map tasks are data-local. You can then click on that to see a list of all the tasks there, and drill down to see which nodes those tasks ran on.
On Tue, Jun 23, 2009 at 6:37 PM, Suratna Budalakoti<sura...@yahoo-inc.com> wrote: > Hi all, > > Is there any way to tell, from logs, or by reading/setting a counter, whether > a particular mapper was data local, i.e., it ran on the same node as its > input data? > > Thanks, > Suratna >
