Cascading 2.5 supports both Hadoop 1.x and 2.x by providing two
cascading-hadoop2-mr1.jar. These dependencies can
be interchanged but the
new and deprecates older API calls where appropriate. It should be
hadoop1-mr1.jar only supports MapReduce
1 API conventions. With this naming scheme new API conventions can be
introduced without risk of naming collisions on dependencies.
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