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I have investigated that I can create an EMR cluster using different instance types for slave and master nodes via Java, i.e. 

 RunJobFlowRequest request = new RunJobFlowRequest()
 .withMasterInstanceType("m3.large")
.withSlaveInstanceType("m3.xlarge")

But it is not possible to do this via AWS Console. There I can choose only one instance type for both slave nodes and master node. I wonder why Amazon has disabled this option in AWS Console and will I face any issues if I will choose different types of instances, i.e m3.xlarge for the master node and m3.large for the slave nodes?

Screenshot from my AWS Console

John Doe
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1 Answers1

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Yes, you can specify a different instance type for master and core nodes via the AWS Console. You need to click on "Go to advanced options" when creating a cluster

Dave Whittingham
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