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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3992) Reduce fetcher doesn't verify HTTP status code of response
Date Tue, 20 Mar 2012 21:13:41 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13233764#comment-13233764

Hudson commented on MAPREDUCE-3992:

Integrated in Hadoop-Mapreduce-0.23-Build #231 (See [https://builds.apache.org/job/Hadoop-Mapreduce-0.23-Build/231/])
    MAPREDUCE-3992. Reduce fetcher doesn't verify HTTP status code of response. Contributed
by Todd Lipcon. (Revision 1302755)

     Result = FAILURE
todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1302755
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

> Reduce fetcher doesn't verify HTTP status code of response
> ----------------------------------------------------------
>                 Key: MAPREDUCE-3992
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3992
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv1
>    Affects Versions: 0.23.1, 0.24.0, 1.0.1
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 0.24.0, 0.23.3
>         Attachments: mr-3992-branch-1.txt, mr-3992.txt
> Currently, the reduce fetch code doesn't check the HTTP status code of the response.
This can lead to the following situation:
> - the map output servlet gets an IOException after setting the headers but before the
first call to flush()
> - this causes it to send a response with a non-OK result code, including the exception
text as the response body (response.sendError() does this if the response isn't committed)
> - it will still include the response headers indicating it's a valid response
> In the case of a merge-to-memory, the compression codec might then try to interpret the
HTML response as compressed data, resulting in either a huge allocation (OOME) or some other
nasty error. This bug seems to be present in MR1, but haven't checked trunk/MR2 yet.

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