Keith Turner created MAPREDUCE-7318:
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Summary: Possible Integer Overflow in MapTask.java
Key: MAPREDUCE-7318
URL: https://issues.apache.org/jira/browse/MAPREDUCE-7318
Project: Hadoop Map/Reduce
Issue Type: Bug
Affects Versions: 3.2.2, 3.1.4, 3.3.0
Reporter: Keith Turner
The following code may overflow when the number of reduce task is large and the
MR sortmb setting is close to 2G. In the expression kvbuffer.length,
partitions, , and APPROX_HEADER_LENGTH are all integers. The expression
assigns to a long, but the conversion to long would occur after the expression
was evaluated and integer overflow may have occurred.
https://github.com/apache/hadoop/blob/1e877761e8dadd71effef30e592368f7fe66a61b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/MapTask.java#L1713
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