Online resources exist, but they are sparse. There is of course a full JavaDoc online at http://docs.concurrentinc.com/cascading/<version>/javadoc/cascading-core/. Concurrent maintains a pretty full set of JavaDocs for each version. Currently 2.6 is the most recent, but 3.0 is coming soon!

There is also a user's guide online. This can be found at http://docs.cascading.org/cascading/<version>/userguide/html/. There is a six-part quick start tutorial that is located at http://docs.cascading.org/tutorials/etl-log/. There is a six-part tutorial that is also quite good called Cascading for the Impatient at http://docs.cascading.org/impatient/ and in general, a good location for other Cascading references and documentation is http://www.cascading.org/documentation/.

All code is available on GitHub and can be found at https://github.com/Cascading. Start here. There is a lot here that will help you. In fact, in some cases it is a good idea to simply download the...