[jira] [Updated] (MAPREDUCE-3344) o.a.h.mapreduce.Reducer since 0.21 blindly casts to ReduceContext.ValueIterator

["Brock Noland (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3344?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Brock Noland updated MAPREDUCE-3344:
------------------------------------

    Attachment: MAPREDUCE-3344-1.patch

Attached is a patch which wraps the cast in an instanceof thereby avoiding a possible cast class exception.
                
> 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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