46 lines
1.4 KiB
Go
46 lines
1.4 KiB
Go
package schedulers
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import (
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mesos "github.com/mesos/mesos-go/api/v0/mesosproto"
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sched "github.com/mesos/mesos-go/api/v0/scheduler"
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"math/rand"
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)
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type SchedPolicyContext interface {
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// Change the state of scheduling.
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SwitchSchedPol(s SchedPolicyState)
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}
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type SchedPolicyState interface {
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// Define the particular scheduling policy's methodology of resource offer consumption.
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ConsumeOffers(SchedPolicyContext, sched.SchedulerDriver, []*mesos.Offer)
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}
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type baseSchedPolicyState struct {
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SchedPolicyState
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// Keep track of the number of tasks that have been scheduled.
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numTasksScheduled int
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}
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func (bsps *baseSchedPolicyState) switchIfNecessary(spc SchedPolicyContext) {
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baseSchedRef := spc.(*BaseScheduler)
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// Switch scheduling policy only if feature enabled from CLI
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if baseSchedRef.schedPolSwitchEnabled {
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// Need to recompute size of the scheduling window for the next offer cycle.
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// The next scheduling policy will schedule at max schedWindowSize number of tasks.
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baseSchedRef.schedWindowSize, baseSchedRef.numTasksInSchedWindow =
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baseSchedRef.schedWindowResStrategy.Apply(func() interface{} { return baseSchedRef.tasks })
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// Switching to a random scheduling policy.
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// TODO: Switch based on some criteria.
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index := rand.Intn(len(SchedPolicies))
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for _, v := range SchedPolicies {
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if index == 0 {
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spc.SwitchSchedPol(v)
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// Resetting the number of tasks scheduled.
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bsps.numTasksScheduled = 0
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break
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}
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index--
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}
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}
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}
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