Add warning message for the overflow in reduce() of
org.apache.hadoop.mapreduce.lib.reduce.IntSumReducer
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Key: MAPREDUCE-3385
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3385
Project: Hadoop Map/Reduce
Issue Type: Improvement
Reporter: JiangKai
Priority: Minor
Fix For: 0.24.0
When we call the function reduce() of IntSumReducer,the result may overflow.
We should send a warning message to users if overflow occurs.
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