IFairshareSchedulingPolicy

class aws_cdk.aws_batch.IFairshareSchedulingPolicy(*args, **kwargs)

Bases: ISchedulingPolicy, Protocol

Represents a Fairshare Scheduling Policy. Instructs the scheduler to allocate ComputeEnvironment vCPUs based on Job shareIdentifiers.

The Faireshare Scheduling Policy ensures that each share gets a certain amount of vCPUs. It does this by deciding how many Jobs of each share to schedule relative to how many jobs of each share are currently being executed by the ComputeEnvironment. The weight factors associated with each share determine the ratio of vCPUs allocated; see the readme for a more in-depth discussion of fairshare policies.

Methods

apply_removal_policy(policy)

Apply the given removal policy to this resource.

The Removal Policy controls what happens to this resource when it stops being managed by CloudFormation, either because you’ve removed it from the CDK application or because you’ve made a change that requires the resource to be replaced.

The resource can be deleted (RemovalPolicy.DESTROY), or left in your AWS account for data recovery and cleanup later (RemovalPolicy.RETAIN).

Parameters:

policy (RemovalPolicy) –

Return type:

None

Attributes

compute_reservation

Used to calculate the percentage of the maximum available vCPU to reserve for share identifiers not present in the Queue.

The percentage reserved is defined by the Scheduler as: (computeReservation/100)^ActiveFairShares where ActiveFairShares is the number of active fair share identifiers.

For example, a computeReservation value of 50 indicates that AWS Batch reserves 50% of the maximum available vCPU if there’s only one fair share identifier. It reserves 25% if there are two fair share identifiers. It reserves 12.5% if there are three fair share identifiers.

A computeReservation value of 25 indicates that AWS Batch should reserve 25% of the maximum available vCPU if there’s only one fair share identifier, 6.25% if there are two fair share identifiers, and 1.56% if there are three fair share identifiers.

Default:

no vCPU is reserved

env

The environment this resource belongs to.

For resources that are created and managed by the CDK (generally, those created by creating new class instances like Role, Bucket, etc.), this is always the same as the environment of the stack they belong to; however, for imported resources (those obtained from static methods like fromRoleArn, fromBucketName, etc.), that might be different than the stack they were imported into.

node: The tree node.

scheduling_policy_arn

The arn of this scheduling policy.

Attribute:: true

scheduling_policy_name

The name of this scheduling policy.

Attribute:: true

share_decay

The amount of time to use to measure the usage of each job.

The usage is used to calculate a fair share percentage for each fair share identifier currently in the Queue. A value of zero (0) indicates that only current usage is measured. The decay is linear and gives preference to newer jobs.

The maximum supported value is 604800 seconds (1 week).

Default:

0: only the current job usage is considered

shares

The shares that this Scheduling Policy applies to.

Note: It is possible to submit Jobs to the queue with Share Identifiers that are not recognized by the Scheduling Policy.

stack: The stack in which this resource is defined.