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Pangool - Tuple MapReduce for Hadoop and MapReduce made easy
Pangool is a framework on top of Hadoop that implements Tuple MapReduce. It supports secondary sorting, Built-in reduce-side joining capabilities, Built-in serialization support for Thrift and ProtoStuff and lot more.
PigPen is map-reduce for Clojure, or distributed Clojure. It compiles to Apache Pig or Cascading but you don't need to know much about either of them to use it. It provides the ability to write map-reduce queries as programs, not as scripts.