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guideline for application logging

Question asked by newuser999 on Jan 4, 2013
Latest reply on Jan 4, 2013 by keysbotzum
How is application logging generally done in Hadoop processing? I certainly don't want to check all the logs on distributed servers if that's where to find mapper logs. Do I have to pass logging data generated in mappers to reducer?
A pointer to a tutorial or example code would also be appreciated.

TIA.

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