Running R script on AWS EMS

• Install Amazon EMR Command Line Interface

1. Install Ruby (1.8 up)
2. Download and unzip CLI (http://aws.amazon.com/developertools/2264)
3. Configure credential.json

                     {
                        "access_id": "AWS Access Key ID",
                        "private_key":"AWS Secret Access Key",
                        "keypair": "EC2 keypair name",
                        "key-pair-file":"pem location",
                        "log_uri":"s3n://log-location",
                        "region":"us-east-1"
                      }

• Job Flow Essentials

1. Creating a Job Flow  (./elastic-mapreduce --create --alive)
2. Listing all Job Flow (./elastic-mapreduce  --list
3. Retrieving information about a specific Job Flow (./elastic-mapreduce --describe --jobflow ID)
4. Adding a step using default parameter values to a Job Flow (./elastic-mapreduce -j ID --stream)
5. Terminating a Job Flow (./elastic-mapreduce --terminate ID)
6. Listing all active Job Flows (./elastic-mapreduce --list --active)

• Streaming Job Flow

                ./elastic-mapreduce --create --stream \

                                     --mapper s3n://[mapper-location]

                                     --input s3n://[input-location]

                                     --output s3n://[output-location]

                                     --reducer s3n://[reducer-location]