[jira] Created: (HADOOP-1971) Constructing a JobConf without a class leads to a very misleading error message.

[Ted Dunning (JIRA)]

Constructing a JobConf without a class leads to a very misleading error message.
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                 Key: HADOOP-1971
                 URL: https://issues.apache.org/jira/browse/HADOOP-1971
             Project: Hadoop
          Issue Type: Bug
          Components: mapred
    Affects Versions: 0.13.1
         Environment: Centos, java 1.5
            Reporter: Ted Dunning
            Priority: Minor


If this line from a typical map/reduce program

        JobConf conf = new JobConf(Flatten.class);

has the argument deleted then I get a message that the input format that I 
specify cannot be found.  That message leads a naive user on a rat chase.  I 
only corrected this by bisecting against a working program.



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