func (sched *ExampleScheduler) StatusUpdate(driver sched.SchedulerDriver, status *mesos.TaskStatus) {
log.Infoln("Status update: task", status.TaskId.GetValue(), " is in state ", status.State.Enum().String())
if status.GetState() == mesos.TaskState_TASK_FINISHED {
sched.tasksFinished++
}
if sched.tasksFinished >= sched.totalTasks {
log.Infoln("Total tasks completed, stopping framework.")
driver.Stop(false)
}
if status.GetState() == mesos.TaskState_TASK_LOST ||
status.GetState() == mesos.TaskState_TASK_KILLED ||
status.GetState() == mesos.TaskState_TASK_FAILED ||
status.GetState() == mesos.TaskState_TASK_ERROR {
log.Infoln(
"Aborting because task", status.TaskId.GetValue(),
"is in unexpected state", status.State.String(),
"with message", status.GetMessage(),
)
driver.Abort()
}
}
func (sched *ExampleScheduler) ResourceOffers(driver sched.SchedulerDriver, offers []*mesos.Offer) {
if sched.tasksLaunched >= sched.totalTasks {
log.Info("decline all of the offers since all of our tasks are already launched")
ids := make([]*mesos.OfferID, len(offers))
for i, offer := range offers {
ids[i] = offer.Id
}
driver.LaunchTasks(ids, []*mesos.TaskInfo{}, &mesos.Filters{RefuseSeconds: proto.Float64(120)})
return
}
for _, offer := range offers {
cpuResources := util.FilterResources(offer.Resources, func(res *mesos.Resource) bool {
return res.GetName() == "cpus"
})
cpus := 0.0
for _, res := range cpuResources {
cpus += res.GetScalar().GetValue()
}
memResources := util.FilterResources(offer.Resources, func(res *mesos.Resource) bool {
return res.GetName() == "mem"
})
mems := 0.0
for _, res := range memResources {
mems += res.GetScalar().GetValue()
}
log.Infoln("Received Offer <", offer.Id.GetValue(), "> with cpus=", cpus, " mem=", mems)
remainingCpus := cpus
remainingMems := mems
var tasks []*mesos.TaskInfo
for sched.tasksLaunched < sched.totalTasks &&
CPUS_PER_TASK <= remainingCpus &&
MEM_PER_TASK <= remainingMems {
sched.tasksLaunched++
taskId := &mesos.TaskID{
Value: proto.String(strconv.Itoa(sched.tasksLaunched)),
}
task := &mesos.TaskInfo{
Name: proto.String("go-task-" + taskId.GetValue()),
TaskId: taskId,
SlaveId: offer.SlaveId,
Executor: sched.executor,
Resources: []*mesos.Resource{
util.NewScalarResource("cpus", CPUS_PER_TASK),
util.NewScalarResource("mem", MEM_PER_TASK),
},
}
log.Infof("Prepared task: %s with offer %s for launch\n", task.GetName(), offer.Id.GetValue())
tasks = append(tasks, task)
remainingCpus -= CPUS_PER_TASK
remainingMems -= MEM_PER_TASK
}
log.Infoln("Launching ", len(tasks), "tasks for offer", offer.Id.GetValue())
driver.LaunchTasks([]*mesos.OfferID{offer.Id}, tasks, &mesos.Filters{RefuseSeconds: proto.Float64(5)})
}
}