Documentation & classification of various configuration knobs
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                 Key: HADOOP-1307
                 URL: https://issues.apache.org/jira/browse/HADOOP-1307
             Project: Hadoop
          Issue Type: Wish
          Components: documentation
            Reporter: Arun C Murthy


Given the ever-increasing number of configuration knobs for both dfs and 
mapred, it would be very useful in the long run to start and maintain 
up-to-date information (on the hadoop-wiki?) for these. While we are at it, it 
could be well worth the time to classify each as USER (must be overridden by 
user e.g. mapred.input/output.dir), BEGINNER, INTERMEDIATE, EXPERT (see 
HADOOP-1304) so as to clearly demarcate them.

Thoughts?

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