o.a.h.mapreduce.Reducer since 0.21 blindly casts to ReduceContext.ValueIterator
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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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