You are running a job in an EMR cluster, and the job is running for a long period of time. You want to add additional horsepower to your cluster, and at the same time you want to make sure it is cost-effective. What is the best way of solving this problem?

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You are running a job in an EMR cluster, and the job is running for a long period of time. You want to add additional horsepower to your cluster, and at the same time you want to make sure it is cost-effective. What is the best way of solving this problem?