Hi, I would like to debug the shuffle phase from a Reducer, but I can't because the Reducer starts as a new process. I've tried all the options that some pages says, but it doesn't work in the way that I want.
I've tried the IsolationRunner class and the LocaJobRunner, but I couldn't put them to work properly. I've also tried these classes with the option <property> <name>mapred.job.tracker</name> <value>local</value> </property> but the tasktracker won't run, because it says that local is not in the format of host and port. I've also tried with a downloaded class called SingleProcessHadoop, but I also can't debug the Reducer because the Reduce Task runs as a new process. Can anyone give me a fully working example that can allow me to put debug point in the ReduceTask? Thanks, -- PSC
