Milind the map-side sort uses the partiion as the primary key. So, you still sort.
See MR-1639 for more details. On Oct 19, 2011, at 3:22 PM, <[email protected]> wrote: > How is that different from specifying a comparator that always returns > that k1 and k2 are equal regardless of k1 and k2 ? So, you will get only > partitioning, and not sorting. > > - Milind > > > On 10/19/11 2:42 PM, "Zheng Shao" <[email protected]> wrote: > >> Google's Tenzing paper mentioned that they modified MR to make sorting in >> reducer optional: >> http://static.googleusercontent.com/external_content/untrusted_dlcp/resear >> ch.google.com/en/us/pubs/archive/37200.pdf >> >> Is there any plan to support that in MR 2.0? >> >> Zheng >
