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Driver Kill() does not block Stats() #1454

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merged 1 commit into from
Jul 23, 2016
Merged

Driver Kill() does not block Stats() #1454

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40 changes: 21 additions & 19 deletions client/alloc_runner.go
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Original file line number Diff line number Diff line change
Expand Up @@ -164,10 +164,9 @@ func (r *AllocRunner) SaveState() error {
}

// Save state for each task
r.taskLock.RLock()
defer r.taskLock.RUnlock()
runners := r.getTaskRunners()
var mErr multierror.Error
for _, tr := range r.tasks {
for _, tr := range runners {
if err := r.saveTaskRunnerState(tr); err != nil {
mErr.Errors = append(mErr.Errors, err)
}
Expand Down Expand Up @@ -431,29 +430,25 @@ OUTER:
}

// Update the task groups
r.taskLock.RLock()
for _, task := range tg.Tasks {
tr := r.tasks[task.Name]
runners := r.getTaskRunners()
for _, tr := range runners {
tr.Update(update)
}
r.taskLock.RUnlock()

case <-r.destroyCh:
break OUTER
}
}

// Destroy each sub-task
r.taskLock.Lock()
for _, tr := range r.tasks {
runners := r.getTaskRunners()
for _, tr := range runners {
tr.Destroy()
}

// Wait for termination of the task runners
for _, tr := range r.tasks {
for _, tr := range runners {
<-tr.WaitCh()
}
r.taskLock.Unlock()

// Final state sync
r.syncStatus()
Expand Down Expand Up @@ -494,6 +489,19 @@ func (r *AllocRunner) StatsReporter() AllocStatsReporter {
return r
}

// getTaskRunners is a helper that returns a copy of the task runners list using
// the taskLock.
func (r *AllocRunner) getTaskRunners() []*TaskRunner {
// Get the task runners
r.taskLock.RLock()
defer r.taskLock.RUnlock()
runners := make([]*TaskRunner, 0, len(r.tasks))
for _, tr := range r.tasks {
runners = append(runners, tr)
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Since we know how many task runners we are going to return and not filtering them

runners := make([]*TaskRunner,len(r.tasks))
for i, tr := range r.tasks {
  runners[i] = tr
}

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r.tasks is a map

}
return runners
}

// LatestAllocStats returns the latest allocation stats. If the optional taskFilter is set
// the allocation stats will only include the given task.
func (r *AllocRunner) LatestAllocStats(taskFilter string) (*cstructs.AllocResourceUsage, error) {
Expand All @@ -517,13 +525,7 @@ func (r *AllocRunner) LatestAllocStats(taskFilter string) (*cstructs.AllocResour
}
} else {
// Get the task runners
r.taskLock.RLock()
runners := make([]*TaskRunner, 0, len(r.tasks))
for _, tr := range r.tasks {
runners = append(runners, tr)
}
r.taskLock.RUnlock()

runners := r.getTaskRunners()
for _, tr := range runners {
l := tr.LatestResourceUsage()
if l != nil {
Expand Down