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MapReduce, mail # dev - Question on "mapred." vs "mapreduce." settings for Hadoop trunk and 2.x

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Question on "mapred." vs "mapreduce." settings for Hadoop trunk and 2.x
German Florez-Larrahondo 2013-07-18, 18:38


By looking at the code in trunk and release 2.0.5 I noticed that while most
settings related to MapReduce now have the mapreduce prefix (as in
"mapreduce.job.dir") there are still a few that have the mapred prefix, as
in "mapred.input.format.class", "mapred.mapper.class",  and others.


Is there a reason for this?  Or is this just legacy code?






PS: A related discussion on this topic is here:



German Florez-Larrahondo, Ph.D.

Distributed Computing & Storage SW Engineer

SARC Architecture


Samsung Austin R&D Center (SARC)

7300 RR 2222 Austin, TX 78730

Office: 512-425-3365

Mobile: 205-441-0266