Answer B sounds pathologically bad to me. A or C are the only viable options.
Neither B nor D work. B fails because it would be extremely hard to get the right records to the right components and because it pollutes data input with configuration data. D fails because statics don't work in parallel programs. On Fri, Dec 28, 2012 at 12:17 AM, Kshiva Kps <kshiva...@gmail.com> wrote: > > Which one is current .. > > > What is the preferred way to pass a small number of configuration > parameters to a mapper or reducer? > > > > > > *A. *As key-value pairs in the jobconf object. > > * * > > *B. *As a custom input key-value pair passed to each mapper or reducer. > > * * > > *C. *Using a plain text file via the Distributedcache, which each mapper > or reducer reads. > > * * > > *D. *Through a static variable in the MapReduce driver class (i.e., the > class that submits the MapReduce job). > > > > *Answer: B* > > >
