DZone

Amazon EMR is a web service which allows developers to easily and efficiently process enormous amounts of data. It uses a hosted Hadoop framework running on the web-scale infrastructure of Amazon EC2 and Amazon S3.

Amazon EMR removes most of the cumbersome details of Hadoop, while taking care of provisioning Hadoop, running the job flow, terminating the job flow, moving the data between Amazon EC2 and Amazon S3, and optimizing Hadoop.

Source: DZone