Cascading.jruby is a small DSL above Cascading (http://www.cascading.org/). It requires Hadoop (>= 0.19) and Cascading (>=1.0.1) to be set via the environment variables: HADOOP_HOME and CASCASDING_HOME. In order to use the extensions for Cascading.hbase and Cascading.jdbc, the following variables should be set as well: CASCADING_HBASE_HOME and CASCADING_JDBC_HOME. Copyright 2009, Grégoire Marabout.