Yes, you should look at JobInProgress class, and search for 'speculative'. JobTracker already has logic to launch speculative copies for tasks which are progressing at a degraded rate relative to other tasks.
HTH, +Vinod Kumar Vavilapalli Hortonworks Inc. http://hortonworks.com/ On Nov 25, 2012, at 2:18 PM, Samaneh Shokuhi wrote: > Hi , > > I need to detect the straggler map tasks specifically the last one to do > some experiments .As i undestood job tracker is aware of all map tasks ,so > is there any way to know the current running map task is the > last(straggler) one ? > > > Samaneh
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