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Amazon refers to the process of standing up an EMR cluster as creating a "job flow." You can do this from the command line, using a technique we'll detail later, but you can also do it from your browser. Just navigate to the EMR home page in the AWS console at https://console.aws.amazon.com/elasticmapreduce, and click the Create New Job Flow button at the top left. Doing so will bring up the Create a New Job Flow dialog box (a wizard, essentially), the first screen of which is shown here.
An EMR cluster can use Amazon's own distribution of Hadoop, or MapR's M3 or M5 distrubution instead. M5 carries a premium billing rate as it not MapR's open source distro.