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From "Tom White (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3344) o.a.h.mapreduce.Reducer since 0.21 blindly casts to ReduceContext.ValueIterator
Date Fri, 04 Nov 2011 22:25:51 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13144412#comment-13144412
] 

Tom White commented on MAPREDUCE-3344:
--------------------------------------

+1
                
> 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
>         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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