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Amazon Elastic MapReduce
API Reference (API Version 2009-03-31)

InstanceGroupConfig

Configuration defining a new instance group.

Contents

AutoScalingPolicy

An automatic scaling policy for a core instance group or task instance group in an Amazon EMR cluster. The automatic scaling policy defines how an instance group dynamically adds and terminates EC2 instances in response to the value of a CloudWatch metric. See PutAutoScalingPolicy.

Type: AutoScalingPolicy object

Required: No

BidPrice

The maximum Spot price your are willing to pay for EC2 instances.

If BidPrice is specified, Amazon EMR uses Spot Instances for the instance group. Specified in USD. Alternatively, a value of OnDemandPrice indicates that the maximum Spot price is set equal to the On-Demand price.

Type: String

Length Constraints: Minimum length of 0. Maximum length of 256.

Pattern: [\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*

Required: No

Configurations

Note

Amazon EMR releases 4.x or later.

The list of configurations supplied for an EMR cluster instance group. You can specify a separate configuration for each instance group (master, core, and task).

Type: Array of Configuration objects

Required: No

EbsConfiguration

EBS configurations that will be attached to each EC2 instance in the instance group.

Type: EbsConfiguration object

Required: No

InstanceCount

Target number of instances for the instance group.

Type: Integer

Required: Yes

InstanceRole

The role of the instance group in the cluster.

Type: String

Valid Values: MASTER | CORE | TASK

Required: Yes

InstanceType

The EC2 instance type for all instances in the instance group.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 256.

Pattern: [\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*

Required: Yes

Market

Market type of the EC2 instances used to create a cluster node.

Type: String

Valid Values: ON_DEMAND | SPOT

Required: No

Name

Friendly name given to the instance group.

Type: String

Length Constraints: Minimum length of 0. Maximum length of 256.

Pattern: [\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*

Required: No

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following:

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