Hi Pedro, I know its sub-optimal but you should be able to put in as many System.out.println / log messages as you want and you should be able to see them in stdout, and syslog files. Which version of hadoop are you using?
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, > >
