Input key and value to combiner and reducer should be reused
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Key: HADOOP-2399
URL: https://issues.apache.org/jira/browse/HADOOP-2399
Project: Hadoop
Issue Type: Bug
Components: mapred
Affects Versions: 0.15.1
Reporter: Owen O'Malley
Assignee: Owen O'Malley
Fix For: 0.16.0
Currently, the input key and value are recreated on every iteration for input
to the combiner and reducer. It would speed up the system substantially if we
reused the keys and values. The down side of doing it, is that it may break
applications that count on holding references to previous keys and values, but
I think it is worth doing.
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