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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1385) MD5Hash has a bad hash function
Date Thu, 17 May 2007 23:36:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12496727
] 

Hadoop QA commented on HADOOP-1385:
-----------------------------------

+1

http://issues.apache.org/jira/secure/attachment/12357585/1385.patch applied and successfully
tested against trunk revision r539135.

Test results:   http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/156/testReport/
Console output: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/156/console

> 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
>
>         Attachments: 1385.patch
>
>
> 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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