JobConf needs better javadoc
----------------------------

                 Key: HADOOP-742
                 URL: http://issues.apache.org/jira/browse/HADOOP-742
             Project: Hadoop
          Issue Type: Bug
    Affects Versions: 0.8.0
            Reporter: Nigel Daley
            Priority: Minor


The org.apache.hadoop.mapred.JobConf class needs better javadoc comments.  

In general terms, these guidelines should be followed:
  - http://java.sun.com/j2se/javadoc/writingdoccomments/#styleguide
      - document the unchecked exceptions that the caller might reasonably want 
to catch
      - use <code> font appropriately (detailed in link above)
  - document default values and appropriate configuration file properties
  - comments, tags, links, etc used consistently across API

In particular, the javadoc for this class should at least answer these 
questions:
  - all constructors: what happens if the supplied class, file path, or 
configuration doesn't exist or is null?
  - JobConf() constructor: where are default values loaded from?
  - JobConf(Configuration) constructor: indicate that this is effectively a 
copy constructor
  - JobConf(String) constructor: are there any format requirements on the 
string?  local and dfs paths allowed?
  - setter methods that take a path: what happens if the path doesn't exist?
  - getter methods returning objects: if value has not been set, is null 
returned or something else?
  - are JobConf objects immutable?  If not, why not?
  - setNum*Tasks: is this per TaskTracker? or something else?
  - methods that take a Path: what if the path is relative?
  - setWorkingDirectory: is this deleted at the end of a job?  should it be 
local or dfs?
  - *KeepFailedTaskFiles: if they are kept, where can they be found?
  - *KeepTaskFilesPattern: what does "the files" mean? if they are kept, where 
can they be found?
  - deleteLocalFiles: undoubtedly a risky operation.  Need a good spec.  Is it 
a recursive delete?
  - which configuration entries are mandatory (i.e. must be set before 
submitting the job)?


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