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From "Robert Joseph Evans (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-4423) Potential infinite fetching of map output
Date Wed, 25 Jul 2012 21:06:35 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4423?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Joseph Evans updated MAPREDUCE-4423:
-------------------------------------------

    Attachment: MR-4423.txt

I determined what the problem was.  It was not that this patch is flawed, but it was exposing
another transient issue that was committed recently MAPREDUCE-4384.

I did find a few minor issue with the previous patch that I have fixed in this one.
                
> Potential infinite fetching of map output
> -----------------------------------------
>
>                 Key: MAPREDUCE-4423
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4423
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.3, 2.1.0-alpha, 3.0.0
>            Reporter: Robert Joseph Evans
>            Assignee: Robert Joseph Evans
>            Priority: Critical
>             Fix For: 0.23.3, 3.0.0, 2.2.0-alpha
>
>         Attachments: MR-4423.txt, MR-4423.txt, MR-4423.txt
>
>
> Inside Fetcher.java there are a few cases where an error can happen and the corresponding
map task is not marked as a fetch failure.  One of these is if the Shuffle server returns
a malformed result.
> MAPREDUCE-3992 makes this case a lot less common, but it is still possible.  IF the shuffle
handler always returns a malformed result, but a OK response the Fetcher will never stop trying
to fetch those results. 

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