Mapreduce 0.20.* api has the support for both 0.19 api (which is
MapRed package in which your mapper should extend MRBase and implements
Mapper) and it has the new api as well (which is MapReduce packages where
you directly extend Mapper).
As there are significant changes in 20 api may be for backward
compatibility mapred package is still in existence.
There are few classes which exist in 19 api and those are not
supported in 0.20.* version.
On Mon, Jan 7, 2013 at 11:44 PM, Oleg Zhurakousky <
[EMAIL PROTECTED]> wrote:
> What is the differences between the two?
> It seems like MR job could be configured using one of the other (e.g,
> "extends MapReduceBase implements Mapper" of "extends Mapper")