The same mapper class will be used for all map tasks. Individual tasks could perhaps do something clever like recover their task ids and do something different based on task id modulo the number of distinct task types, but in general, the idea behind MapReduce is that all tasks should be applying the same process to all of your data.
A single MapReduce job is specifically not intended to be utilized as a pipeline of different types of workers. For that, you should use multiple MapReduce jobs in series. - Aaron 2009/10/6 María Helena Mejía Salazar <mhme...@gmail.com> > Hi, > > The same task can be done in different ways, i.e a sort task can be done > by merge sort, heap sort etc. > > Is possible in MapReduce assign different task to the workers? Can the > master assign a merge sort task to one worker and assign heap sort task to > another worker? > > Thanks, > > > Maria
