package awscdkbatchalpha


// Determines how this compute environment chooses instances to spawn.
//
// Example:
//   var vpc iVpc
//
//
//   computeEnv := batch.NewManagedEc2EcsComputeEnvironment(this, jsii.String("myEc2ComputeEnv"), &ManagedEc2EcsComputeEnvironmentProps{
//   	Vpc: Vpc,
//   	AllocationStrategy: batch.AllocationStrategy_BEST_FIT,
//   })
//
// See: https://aws.amazon.com/blogs/compute/optimizing-for-cost-availability-and-throughput-by-selecting-your-aws-batch-allocation-strategy/
//
// Experimental.
type AllocationStrategy string

const (
	// Batch chooses the lowest-cost instance type that fits all the jobs in the queue.
	//
	// If instances of that type are not available, the queue will not choose a new type;
	// instead, it will wait for the instance to become available.
	// This can stall your `Queue`, with your compute environment only using part of its max capacity
	// (or none at all) until the `BEST_FIT` instance becomes available.
	// This allocation strategy keeps costs lower but can limit scaling.
	// `BEST_FIT` isn't supported when updating compute environments.
	// Experimental.
	AllocationStrategy_BEST_FIT AllocationStrategy = "BEST_FIT"
	// This is the default Allocation Strategy if `spot` is `false` or unspecified.
	//
	// This strategy will examine the Jobs in the queue and choose whichever instance type meets the requirements
	// of the jobs in the queue and with the lowest cost per vCPU, just as `BEST_FIT`.
	// However, if not all of the capacity can be filled with this instance type,
	// it will choose a new next-best instance type to run any jobs that couldn’t fit into the `BEST_FIT` capacity.
	// To make the most use of this allocation strategy,
	// it is recommended to use as many instance classes as is feasible for your workload.
	// Experimental.
	AllocationStrategy_BEST_FIT_PROGRESSIVE AllocationStrategy = "BEST_FIT_PROGRESSIVE"
	// If your workflow tolerates interruptions, you should enable `spot` on your `ComputeEnvironment` and use `SPOT_CAPACITY_OPTIMIZED` (this is the default if `spot` is enabled).
	//
	// This will tell Batch to choose the instance types from the ones you’ve specified that have
	// the most spot capacity available to minimize the chance of interruption.
	// To get the most benefit from your spot instances,
	// you should allow Batch to choose from as many different instance types as possible.
	// Experimental.
	AllocationStrategy_SPOT_CAPACITY_OPTIMIZED AllocationStrategy = "SPOT_CAPACITY_OPTIMIZED"
)