Comment by ivanprado

Hi avibryant, According to our initial benchmark (http://pangool.net/benchmark.html), secondary sorting in Cascading is slow (http://bit.ly/wTKOxo), showing a 243% performance overhead compared to an efficient implementation in MapReduce. The implementation in MapReduce has a lot of lines (http://bit.ly/yYGnGe) whereas Pangool's implementation is quite simple (http://bit.ly/x9U7Yj). A common application of secondary sort is calculating moving averages, for instance.