[jira] Created: (HADOOP-1090) In SortValidator, the check for whether a file belongs to sort-input or sort-output dir is weak

[Devaraj Das (JIRA)]

In SortValidator, the check for whether a file belongs to sort-input or 
sort-output dir is weak
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                 Key: HADOOP-1090
                 URL: https://issues.apache.org/jira/browse/HADOOP-1090
             Project: Hadoop
          Issue Type: Bug
          Components: mapred
            Reporter: Devaraj Das
         Assigned To: Arun C Murthy


In SortValidator, Maps invoke the method called deduceInputFile in the 
configure method. The deduceInputFile is supposed to return whether the input 
file belongs to the sort-input directory or the sort-output directory. However, 
the check that deduceInputFile does - 
inputFile.toString().startsWith(inputPaths[0].toString()) - is not totally 
correct. The check will always returns true for inputPaths like 
/user/foo/smallInput/<filenames>, /user/foo/smallInput-sorted/<filenames>. This 
finally causes the SortValidator to declare the sort output as incorrect.

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