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Posted to mapreduce-dev@hadoop.apache.org by "Tamas Sarlos (JIRA)" <ji...@apache.org> on 2010/03/11 23:36:27 UTC

[jira] Created: (MAPREDUCE-1593) [Rumen] Improvements to random seed generation

[Rumen] Improvements to random seed generation 
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                 Key: MAPREDUCE-1593
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1593
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
    Affects Versions: 0.21.0, 0.22.0
            Reporter: Tamas Sarlos
            Priority: Trivial
             Fix For: 0.21.0, 0.22.0


RandomSeedGenerator introduced in MAPREDUCE-1306 could be more efficient by reusing the MD5 object across calls. Wrapping the MD5 in a ThreadLocal makes the call thread safe as well. Neither of these is an issue with the current client, the mumak simulator, but the changes are small and make the code more useful in the future. Thanks to Chris Douglas for the suggestion.

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