Disclaimer: I have not google'd this yet! I wanted to jot down what I know as of now.
Before going into differences, I can not stop by think about similarities between : both offer parellel processing.
While Abinitio was doing massive parallel processing long before Hadoop came into existence, it was 1) costly to buy licenses and 2) it was running on enterprise-grade hardware.
Hadoop made massively parallel processing available to masses. It did this by 1) being open source and 2) being able to run on commodity hardware. Since commodity hardware is not very reliable, Hadoop solved this problem by providing built-in fault tolerance
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