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Date: Fri, 27 Jul 2012 12:42:35 +0000 (UTC)
From: "Hudson (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-4423) Potential infinite fetching of
 map output
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-4423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423842#comment-13423842 ] 

Hudson commented on MAPREDUCE-4423:
-----------------------------------

Integrated in Hadoop-Hdfs-0.23-Build #326 (See [https://builds.apache.org/job/Hadoop-Hdfs-0.23-Build/326/])
    MAPREDUCE-4423. Potential infinite fetching of map output (Robert Evans via tgraves) (Revision 1366263)

     Result = SUCCESS
tgraves : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1366263
Files : 
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/task/reduce/Fetcher.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/test/java/org/apache/hadoop/mapreduce/task/reduce/TestFetcher.java

                
> 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-branch-0.23.txt, MR-4423-trunk.txt, MR-4423-trunk.txt, 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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