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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3344) o.a.h.mapreduce.Reducer since 0.21 blindly casts to ReduceContext.ValueIterator
Date Tue, 08 Nov 2011 08:20:52 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13146156#comment-13146156
] 

Hudson commented on MAPREDUCE-3344:
-----------------------------------

Integrated in Hadoop-Mapreduce-0.23-Build #84 (See [https://builds.apache.org/job/Hadoop-Mapreduce-0.23-Build/84/])
    Merge -r 1198909:1198910 from trunk to branch-0.23. Fixes: MAPREDUCE-3344.

tomwhite : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1198914
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/Reducer.java

                
> o.a.h.mapreduce.Reducer since 0.21 blindly casts to ReduceContext.ValueIterator
> -------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3344
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3344
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 0.21.0, 0.22.0, 0.23.0, 0.24.0, 0.23.1
>            Reporter: Brock Noland
>            Assignee: Brock Noland
>             Fix For: 0.24.0, 0.23.1
>
>         Attachments: MAPREDUCE-3344-1.patch
>
>
> 0.21 mapreduce.Reducer introduced a blind cast to ReduceContext.ValueIterator. There
should an instanceof check around this block to ensure we don't throw a CastClassException:
> {code}
>        // If a back up store is used, reset it
>       ((ReduceContext.ValueIterator)
>           (context.getValues().iterator())).resetBackupStore();
> {code}

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