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  1. Preface
  2. Workflows
  3. Workflow Variables
  4. Workflow Parameters
  5. Cluster Tasks
  6. Command Task
  7. Human Task
  8. Mapping Task
  9. Notification Task
  10. Gateways
  11. Workflow Recovery
  12. Workflow Administration

Developer Workflow Guide

Developer Workflow Guide

Core Instance Group Options

Core Instance Group Options

The following table describes core instance group options that you can set for an EMR cluster:
Property
Description
Core Instance Type
Core node EC2 instance type.
You can specify any available EC2 instance type.
Default is m4.4xlarge.
Core Instance Count
Number of core EC2 instances to create in the cluster.
Default is 2.
Core Instance Maximum Spot Price
Maximum spot price for core nodes. Setting this property changes the purchasing option of the core instance group to Spot instead of On-demand.
Core Auto-Scaling Policy
Optional. Auto-scaling policy for core instances. Type the policy JSON statement here, or provide a path to a file that contains a JSON statement.
Format:
file:\\<path_to_policy_config_file>

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