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scheduler: remove error param from doSchedule func

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doSchedule currently accepts err values from previous invocation delegating
error handling in a location different from the caller which can be hard
to debug and is not a good practice.

We still maintain the same invariants after the refactoring. If an err
happened in a previous invocation to Register, the returned task object
was nil causing task.AcceptedOffer() to return false.

By not invoking doSchedule in case of an error we can eliminate the
first `err == nil` check in doScheduler.
This commit is contained in:
Sergiusz Urbaniak 2015-10-20 14:24:20 -07:00
parent 9bbfc35fa9
commit 0ad0c1f2b1
1 changed files with 10 additions and 4 deletions
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14
contrib/mesos/pkg/scheduler/plugin.go
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@ -278,7 +278,11 @@ func (k *kubeScheduler) Schedule(pod *api.Pod, unused algorithm.NodeLister) (str
log.Infof("aborting Schedule, pod has been deleted %+v", pod)
return "", noSuchPodErr
}
return k.doSchedule(k.api.tasks().Register(k.api.createPodTask(ctx, pod)))
task, err := k.api.tasks().Register(k.api.createPodTask(ctx, pod))
if err != nil {
return "", err
}
return k.doSchedule(task)
//TODO(jdef) it's possible that the pod state has diverged from what
//we knew previously, we should probably update the task.Pod state here
@ -294,7 +298,7 @@ func (k *kubeScheduler) Schedule(pod *api.Pod, unused algorithm.NodeLister) (str
// but we're going to let someone else handle it, probably the mesos task error handler
return "", fmt.Errorf("task %s has already been launched, aborting schedule", task.ID)
} else {
return k.doSchedule(task, nil)
return k.doSchedule(task)
}
default:
@ -303,8 +307,10 @@ func (k *kubeScheduler) Schedule(pod *api.Pod, unused algorithm.NodeLister) (str
}
// Call ScheduleFunc and subtract some resources, returning the name of the machine the task is scheduled on
func (k *kubeScheduler) doSchedule(task *podtask.T, err error) (string, error) {
func (k *kubeScheduler) doSchedule(task *podtask.T) (string, error) {
var offer offers.Perishable
var err error
if task.HasAcceptedOffer() {
// verify that the offer is still on the table
offerId := task.GetOfferId()
@ -319,7 +325,7 @@ func (k *kubeScheduler) doSchedule(task *podtask.T, err error) (string, error) {
}
}
}
if err == nil && offer == nil {
if offer == nil {
offer, err = k.api.algorithm().SchedulePod(k.api.offers(), k.api, task)
}
if err != nil {