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From "Jens Rabe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-6155) MapFiles are not always correctly detected by SequenceFileInputFormat
Date Tue, 11 Nov 2014 15:58:33 GMT
Jens Rabe created MAPREDUCE-6155:

             Summary: MapFiles are not always correctly detected by SequenceFileInputFormat
                 Key: MAPREDUCE-6155
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6155
             Project: Hadoop Map/Reduce
          Issue Type: Bug
    Affects Versions: 2.5.1
            Reporter: Jens Rabe

MapFiles are not correctly detected by SequenceFileInputFormat.

This is because the listStatus method only detects a MapFile correctly if the path it checks
is a directory - it then replaces it by the path of the data file.

This is likely to fail if the data file does not exist, i.e., if the input path is a directory,
but does not belong to a MapFile, or if recursion is turned on and the input format comes
across a file (not a directory) which is indeed part of a MapFile.

The listStatus method should be changed to detect these cases correctly:
* if the current candidate is a file and its name is "index" or "data", check if its corresponding
other file exists, and if the key types of both files match and if the value type of the index
file is LongWritable
* If the current candidate is a directory, it is only a MapFile if (and only if) an index
and a data file exist, they are both SequenceFiles and their key types match (and the index
value type is LongWritable)

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