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

InstanceGroup

This entity represents an instance group, which is a group of instances that have common purpose. For example, CORE instance group is used for HDFS.

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: AutoScalingPolicyDescription 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

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

EbsBlockDevices

The EBS block devices that are mapped to this instance group.

Type: Array of EbsBlockDevice objects

Required: No

EbsOptimized

If the instance group is EBS-optimized. An Amazon EBS-optimized instance uses an optimized configuration stack and provides additional, dedicated capacity for Amazon EBS I/O.

Type: Boolean

Required: No

Id

The identifier of the instance group.

Type: String

Required: No

InstanceGroupType

The type of the instance group. Valid values are MASTER, CORE or TASK.

Type: String

Valid Values: MASTER | CORE | TASK

Required: No

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: No

Market

The marketplace to provision instances for this group. Valid values are ON_DEMAND or SPOT.

Type: String

Valid Values: ON_DEMAND | SPOT

Required: No

Name

The name of the instance group.

Type: String

Required: No

RequestedInstanceCount

The target number of instances for the instance group.

Type: Integer

Required: No

RunningInstanceCount

The number of instances currently running in this instance group.

Type: Integer

Required: No

ShrinkPolicy

Policy for customizing shrink operations.

Type: ShrinkPolicy object

Required: No

Status

The current status of the instance group.

Type: InstanceGroupStatus object

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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