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Posted to common-user@hadoop.apache.org by rk...@charter.net on 2013/04/26 23:32:29 UTC

Warnings?

I am running a simple WordCount m/r job and I get output but I get three 
warnings that I am not sure if I should pay attention to:

13/04/26 16:24:50 WARN util.NativeCodeLoader: Unable to load 
native-hadoop library for your platform... using builtin-java classes 
where applicable

13/04/26 16:24:50 WARN conf.Configuration: session.id is deprecated. 
Instead, use dfs.metrics.session-id

13/04/26 16:24:50 WARN mapred.JobClient: Use GenericOptionsParser for 
parsing the arguments. Applications should implement Tool for the same.

Any ideas on what these mean? The only one that I can see in the code is 
the last one. I am using GenericOptionsParser as it is part of an 
example that I copied. But I don't know why this is considered bad.

Thank you.