Option (1) isn't the way that things normally work. Besides, mappers are called many times for each construction of a mapper.
On Mon, Feb 7, 2011 at 3:38 PM, maha <m...@umail.ucsb.edu> wrote: > Hi, > > I would appreciate it if you could give me your thoughts if there is > affect on efficiency if: > > 1) Mappers were per line in a document > > or > > 2) Mappers were per block of lines in a document. > > > I know the obvious difference I can see is that (1) has more mappers. Does > that mean (1) will be slower because of scheduling time ? > > Thank you, > Maha >
