What is the difference between Partitioner, Combiner, Shuffle and sort phase in Map Reduce. What is the order of execution

[#1]

May I ask why you care? Any specific curiosity or performance problem or just curiosity?

[#2]

@ Benjamin Leonhardi Why sorting is written before shuffling? I think sorting always happen after the shuffling. As there is already combiner to combine(sort) the output on single node. I think when all intermediated data collected using shuffling then sorting is use to make one single input file, which will use by reducer.