hadoop.mapred vs hadoop.mapreduce?

Why are there two separate packages map-reduce package in Apache's hadoop package tree:

org.apache.hadoop.mapred

http://javasourcecode.org/html/open-source/hadoop/hadoop-1.0.3/org/apache/hadoop/mapred/

org.apache.hadoop.mapreduce

http://javasourcecode.org/html/open-source/hadoop/hadoop-1.0.3/org/apache/hadoop/mapreduce/

Why are they separated out? Is there documentation that clarifies this?

Copyright Notice：Content Author:「bartonm」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/16269922/hadoop-mapred-vs-hadoop-mapreduce

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