InstanceFleet
Describes an instance fleet, which is a group of Amazon EC2 instances that host a particular node type (master, core, or task) in an Amazon EMR cluster. Instance fleets can consist of a mix of instance types and On-Demand and Spot Instances, which are provisioned to meet a defined target capacity.
Note
The instance fleet configuration is available only in Amazon EMR releases 4.8.0 and later, excluding 5.0.x versions.
Contents
- Context
-
Reserved.
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
- Id
-
The unique identifier of the instance fleet.
Type: String
Required: No
- InstanceFleetType
-
The node type that the instance fleet hosts. Valid values are MASTER, CORE, or TASK.
Type: String
Valid Values:
MASTER | CORE | TASKRequired: No
- InstanceTypeSpecifications
-
An array of specifications for the instance types that comprise an instance fleet.
Type: Array of InstanceTypeSpecification objects
Required: No
- LaunchSpecifications
-
Describes the launch specification for an instance fleet.
Type: InstanceFleetProvisioningSpecifications object
Required: No
- Name
-
A friendly name for the instance fleet.
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
- ProvisionedOnDemandCapacity
-
The number of On-Demand units that have been provisioned for the instance fleet to fulfill
TargetOnDemandCapacity. This provisioned capacity might be less than or greater thanTargetOnDemandCapacity.Type: Integer
Valid Range: Minimum value of 0.
Required: No
- ProvisionedSpotCapacity
-
The number of Spot units that have been provisioned for this instance fleet to fulfill
TargetSpotCapacity. This provisioned capacity might be less than or greater thanTargetSpotCapacity.Type: Integer
Valid Range: Minimum value of 0.
Required: No
- ResizeSpecifications
-
The resize specification for the instance fleet.
Type: InstanceFleetResizingSpecifications object
Required: No
- Status
-
The current status of the instance fleet.
Type: InstanceFleetStatus object
Required: No
- TargetOnDemandCapacity
-
The target capacity of On-Demand units for the instance fleet, which determines how many On-Demand Instances to provision. When the instance fleet launches, Amazon EMR tries to provision On-Demand Instances as specified by InstanceTypeConfig. Each instance configuration has a specified
WeightedCapacity. When an On-Demand Instance is provisioned, theWeightedCapacityunits count toward the target capacity. Amazon EMR provisions instances until the target capacity is totally fulfilled, even if this results in an overage. For example, if there are 2 units remaining to fulfill capacity, and Amazon EMR can only provision an instance with aWeightedCapacityof 5 units, the instance is provisioned, and the target capacity is exceeded by 3 units. You can use InstanceFleet:ProvisionedOnDemandCapacity to determine the Spot capacity units that have been provisioned for the instance fleet.Note
If not specified or set to 0, only Spot Instances are provisioned for the instance fleet using
TargetSpotCapacity. At least one ofTargetSpotCapacityandTargetOnDemandCapacityshould be greater than 0. For a master instance fleet, only one ofTargetSpotCapacityandTargetOnDemandCapacitycan be specified, and its value must be 1.Type: Integer
Valid Range: Minimum value of 0.
Required: No
- TargetSpotCapacity
-
The target capacity of Spot units for the instance fleet, which determines how many Spot Instances to provision. When the instance fleet launches, Amazon EMR tries to provision Spot Instances as specified by InstanceTypeConfig. Each instance configuration has a specified
WeightedCapacity. When a Spot instance is provisioned, theWeightedCapacityunits count toward the target capacity. Amazon EMR provisions instances until the target capacity is totally fulfilled, even if this results in an overage. For example, if there are 2 units remaining to fulfill capacity, and Amazon EMR can only provision an instance with aWeightedCapacityof 5 units, the instance is provisioned, and the target capacity is exceeded by 3 units. You can use InstanceFleet:ProvisionedSpotCapacity to determine the Spot capacity units that have been provisioned for the instance fleet.Note
If not specified or set to 0, only On-Demand Instances are provisioned for the instance fleet. At least one of
TargetSpotCapacityandTargetOnDemandCapacityshould be greater than 0. For a master instance fleet, only one ofTargetSpotCapacityandTargetOnDemandCapacitycan be specified, and its value must be 1.Type: Integer
Valid Range: Minimum value of 0.
Required: No
See Also
For more information about using this API in one of the language-specific AWS SDKs, see the following:
