InstanceGroup - Amazon EMR
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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 Amazon EC2 instances in response to the value of a CloudWatch metric. See PutAutoScalingPolicy.

Type: AutoScalingPolicyDescription object

Required: No

BidPrice

If specified, indicates that the instance group uses Spot Instances. This is the maximum price you are willing to pay for Spot Instances. Specify OnDemandPrice to set the amount equal to the On-Demand price, or specify an amount in USD.

Type: String

Required: No

Configurations
Note

Amazon EMR releases 4.x or later.

The list of configurations supplied for an Amazon 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

ConfigurationsVersion

The version number of the requested configuration specification for this instance group.

Type: Long

Required: No

CustomAmiId

The custom AMI ID to use for the provisioned 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

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 Amazon 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

LastSuccessfullyAppliedConfigurations

A list of configurations that were successfully applied for an instance group last time.

Type: Array of Configuration objects

Required: No

LastSuccessfullyAppliedConfigurationsVersion

The version number of a configuration specification that was successfully applied for an instance group last time.

Type: Long

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 Amazon SDKs, see the following: