FileOutputCommitter throws wrong type of exception when calling abortTask() to 
handle a directory without permission
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                 Key: MAPREDUCE-3047
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3047
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
    Affects Versions: 0.24.0
            Reporter: JiangKai
            Priority: Trivial
             Fix For: 0.24.0


When FileOutputCommitter calls abortTask() to create a temp directory, if the 
user has no permission to access the directory, or a file with the same name 
has existed, of course it will fail, however the system will output the error 
information into the log file instead of throwing an exception.As a result, 
when the temp directory is needed later, since the temp directory hasn't been 
created yet, system will throw an exception to tell user that the temp 
directory doesn't exist.In my opinion, the exception is not exact and the error 
infomation will confuse users.

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