Cascading 2.5 supports both Hadoop 1.x and 2.x by providing two Java dependencies, cascading-hadoop.jar and cascading-hadoop2-mr1.jar. These dependencies can be interchanged but the hadoop2-mr1.jar introduces new and deprecates older API calls where appropriate. It should be pointed out 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.