Mike, Check out this wiki http://code.google.com/p/hadoop-clusternet/wiki/DebuggingJobsUsingEclipse
It shows how if your running in stand alone mode you can run a job in debug mode so that you can then start a remote debugging session with Eclipse. You can then step through your code. I've found it to be quite helpful. J On Thu, 2011-04-28 at 14:59 -0400, Mike Spreitzer wrote: > So I wrote my first org.apache.hadoop.madpreduce.Job > (not ...mapred.Job). Oddly enough, when the reducer is invoked, the > "Iterable values" parameter actually iterates over just one value, not > all the corresponding values that were output by my map tasks. I know > this from adding calls to System.out.println to my map and reduce > code. I also know that my combiner was not invoked (also from println > debugging). So now I am trying to determine why things are not being > wired up correctly. What is the right way to debug situations like > this? > > Thanks, > Mike Spreitzer > SMTP: mspre...@us.ibm.com, Lotus Notes: Mike Spreitzer/Watson/IBM > Office phone: +1-914-784-6424 (IBM T/L 863-) > AOL Instant Messaging: M1k3Sprtzr
