On Sat, Sep 10, 2011 at 12:33 PM, Meng Mao <[EMAIL PROTECTED]> wrote:
> Is there a way to collate the possibly large number of map output files,
You can make fewer mappers by setting the mapred.min.split.size to define
the smallest input that will be given to a mapper.
There isn't currently a way of getting a collated, but unsorted list of
key/value pairs. For most applications, the in memory sort is fairly cheap
relative to the shuffle and other parts of the processing.