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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1593) [Rumen] Improvements to random seed generation
Date Fri, 19 Mar 2010 17:08:27 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12847443#action_12847443

Hudson commented on MAPREDUCE-1593:

Integrated in Hadoop-Mapreduce-trunk #263 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-Mapreduce-trunk/263/])
    .  [Rumen] Improvements to random seed generation (tamas via mahadev)

> [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: 0.22.0
>         Attachments: MAPREDUCE-1593-20100311-dup.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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