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From "Matt Foley (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2980) Fetch failures and other related issues in Jetty 6.1.26
Date Thu, 06 Oct 2011 22:33:30 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13122365#comment-13122365
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Matt Foley commented on MAPREDUCE-2980:
---------------------------------------

I'm afraid I don't see a qualitative difference between the "risk" of transitioning from 6.1.14
-> 6.1.26 vs the risk of transitioning from 6.1.26 -> 7.x.  In fact, if we transition
to a version of 7.x that is currently viewed as being *stable* (what a concept!) then it might
be less risky than transitioning to 6.1.27, which does not have any claim of being stable.
                
> Fetch failures and other related issues in Jetty 6.1.26
> -------------------------------------------------------
>
>                 Key: MAPREDUCE-2980
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2980
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>    Affects Versions: 0.20.205.0, 0.23.0
>            Reporter: Todd Lipcon
>            Priority: Critical
>
> Since upgrading Jetty from 6.1.14 to 6.1.26 we've had a ton of HTTP-related issues, including:
> - Much higher incidence of fetch failures
> - A few strange file-descriptor related bugs (eg MAPREDUCE-2389)
> - A few unexplained issues where long "fsck"s on the NameNode drop out halfway through
with a ClosedChannelException
> Stress tests with 10000Map x 10000Reduce sleep jobs reliably reproduce fetch failures
at a rate of about 1 per million on a 25 node test cluster. These problems are all new since
the upgrade from 6.1.14.

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