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From "Tamas Sarlos (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1593) [Rumen] Improvements to random seed generation
Date Tue, 16 Mar 2010 19:40:27 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1593?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Tamas Sarlos updated MAPREDUCE-1593:

    Attachment: MAPREDUCE-1593-20100311-dup.patch

Resubmitting the same patch as Hudson's link to the test report is a 404

> [Rumen] Improvements to random seed generation 
> -----------------------------------------------
>                 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
>            Assignee: Tamas Sarlos
>            Priority: Trivial
>             Fix For: 0.21.0, 0.22.0
>         Attachments: MAPREDUCE-1593-20100311-dup.patch, MAPREDUCE-1593-20100311.patch
> 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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