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> mostly what you need to beat Hadoop is to make something practical, which lets developers be expressive rather than wrestle with overdesigned nonsense.

It would be difficult for an article to convey this. Having used both Hadoop and Spark, practicality and expressiveness are precisely what made me fall in love with Spark. You can do so much with so little code. Don't take anyones word for it, see for yourself. Download the code and run the interactive shell, takes 2 minutes. It was totally mind-blowing for me.