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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-1385) MD5Hash has a bad hash function
Date Thu, 17 May 2007 21:51:16 GMT
MD5Hash has a bad hash function
-------------------------------

                 Key: HADOOP-1385
                 URL: https://issues.apache.org/jira/browse/HADOOP-1385
             Project: Hadoop
          Issue Type: Bug
          Components: io
    Affects Versions: 0.12.3
            Reporter: Owen O'Malley
         Assigned To: Owen O'Malley
             Fix For: 0.13.0


The MD5Hash class has a really bad hash function, that will cause most most md5s to hash to
0xFFFFFFxx leaving only the low order byte as meaningful. The problem comes from the automatic
sign extension when promoting from byte to int.

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