Things I tend to forget

Amazon’s Elastic MapReduce Ruby client allows you to specify which of the supported Hadoop distributions to use, currently either Amazon’s Apache 1.0.3-based distribution or MapR’s M3 and M5 editions.

I found the CLI’s option documented at <http://docs.aws.amazon.com/ElasticMapReduce/latest/DeveloperGuide/emr-mapr.html>:

To launch an Amazon EMR job flow with MapR using the CLI

Set the –with-supported-products parameter to either mapr-m3 or mapr-m5 to run your job flow on the corresponding version of the MapR Hadoop distribution.

The following example launches a job flow running with the M3 Edition of MapR.

elastic-mapreduce –create –alive \
–instance-type m1.xlarge –num-instances 5 \
–with-supported-products mapr-m3

For additional information about launching job flows using the CLI, see the instructions for each job flow type in Create a Job Flow.