MRUnit Allows Iteration Twice
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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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