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From Pedro Costa <psdc1...@gmail.com>
Subject How to debug ReduceTask?
Date Sun, 29 Aug 2010 01:24:18 GMT
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

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


 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?


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