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Date: Wed, 21 Oct 2009 12:55:59 +0000 (UTC)
From: "Ed Kohlwey (JIRA)" <jira@apache.org>
To: mapreduce-dev@hadoop.apache.org
Subject: [jira] Created: (MAPREDUCE-1128) MRUnit Allows Iteration Twice
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MRUnit Allows Iteration Twice
-----------------------------

                 Key: MAPREDUCE-1128
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1128
             Project: Hadoop Map/Reduce
          Issue Type: Bug
    Affects Versions: 0.20.1
         Environment: Java 1.6, Hadoop 0.21.1+133 (cloudera distribution for hadoop)
            Reporter: Ed Kohlwey
            Priority: Minor


MRUnit allows one to iterate over a collection of values twice (ie.

reduce(Key key, Iterable<Value> values, Context context){
   for(Value : values ) /* iterate once */;
   for(Value : values ) /* iterate again */;
}

Hadoop will allow this as well, however the second iterator will be empty. MRUnit should either match hadoop's behavior or warn the user that their code is likely flawed.

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