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https://issues.apache.org/jira/browse/MAPREDUCE-3344?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brock Noland updated MAPREDUCE-3344:
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Target Version/s: 0.21.0, 0.22.0, 0.23.0, 0.24.0, 0.23.1 (was: 0.23.1,
0.24.0, 0.23.0, 0.22.0, 0.21.0)
Status: Patch Available (was: Open)
Patch is ready for review.
> 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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