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Jading is the build and execution tool for cascading.jruby. It isn't required for running cascading.jruby scripts in Cascading local mode on your local machine. But if you want to run a job on a remote Hadoop cluster, you'll need it to package the jar you submit to Hadoop.
The primary entry point to Jading is the script "jade." This script operates in two modes, build and execution. The first allows you to produce jade jars, which contain everything you need to run a cascading.jruby job on a Hadoop cluster. The second is a convenience wrapper for hadoop jar that selects the correct "runner" code from Jading's library to run your job remotely.
For more details, see Getting Started.