Can I suggest unit testing with MRUnit: https://cwiki.apache.org/confluence/display/MRUNIT/Index https://cwiki.apache.org/confluence/display/MRUNIT/MRUnit+Tutorial
Brock On Thu, Mar 29, 2012 at 10:33 AM, Pedro Costa <psdc1...@gmail.com> wrote: > Hi, > > I'm trying to debug map and reduce tasks for a quite long time, and it seems > that it's impossible. MR are launched in new process and there's no way to > debug them. Even with IsolationRunner class it's impossible. This isn't good > because I really need to debug the class, to understand some changes that I > made to the code. > > I wonder how MapReduce programmers could debug the code that they > implemented? > > -- > Best regards, > -- Apache MRUnit - Unit testing MapReduce - http://incubator.apache.org/mrunit/
