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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-18) Under load the shuffle sometimes gets incorrect data
Date Thu, 09 Jul 2009 18:24:14 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-18?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12729367#action_12729367

Owen O'Malley commented on MAPREDUCE-18:

It was trunk after 0.20, but based on my understanding of the likely cause, it would also
affect 0.20.0

> Under load the shuffle sometimes gets incorrect data
> ----------------------------------------------------
>                 Key: MAPREDUCE-18
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-18
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Owen O'Malley
>            Assignee: Ravi Gummadi
>            Priority: Blocker
> While testing HADOOP-5223 under load, we found reduces receiving completely incorrect
data. It was often random, but sometimes was the output of the wrong map for the wrong map.
It appears to either be a Jetty or JVM bug, but it is clearly happening on the server side.
In the HADOOP-5223 code, I added information about the map and reduce that were included and
we should add similar protection to 0.20 and trunk.

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