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From "Brock Noland (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-3344) o.a.h.mapreduce.Reducer since 0.21 blindly casts to ReduceContext.ValueIterator
Date Fri, 04 Nov 2011 02:03:33 GMT
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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