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Remove collisions on PrepareRun stage #546

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merged 3 commits into from
Jun 8, 2018
Merged

Remove collisions on PrepareRun stage #546

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087acb8
remove collisions on prepareTask stage
strangeman Jun 7, 2018
a817d2d
add requested changes, add some logging
strangeman Jun 8, 2018
b60213a
remove task from queue if it failed (on prepare step)
strangeman Jun 8, 2018
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35 changes: 23 additions & 12 deletions api/tasks/pool.go
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Original file line number Diff line number Diff line change
Expand Up @@ -77,25 +77,36 @@ func (p *taskPool) run() {
case task := <-p.register:
p.queue = append(p.queue, task)
log.Debug(task)
task.log("Task " + strconv.Itoa(task.task.ID) + " added to queue")
msg := "Task " + strconv.Itoa(task.task.ID) + " added to queue"
task.log(msg)
log.Info(msg)
case <-ticker.C:
if len(p.queue) == 0 {
continue
} else if t := p.queue[0]; t.task.Status != taskFailStatus && p.blocks(t) {
p.queue = append(p.queue[1:], t)
continue
}

if t := p.queue[0]; t.task.Status != taskFailStatus {
log.Info("Set resourse locker with task " + strconv.Itoa(t.task.ID))
resourceLocker <- &resourceLock{lock: true, holder: t}
if !t.prepared {
go t.prepareRun()
continue
}
go t.run()
//get task from top of queue
t := p.queue[0]
if t.task.Status == taskFailStatus {
//delete failed task from queue
p.queue = p.queue[1:]
log.Info("Task " + strconv.Itoa(t.task.ID) + " removed from queue")
continue
}
if p.blocks(t) {
//move blocked task to end of queue
p.queue = append(p.queue[1:], t)
continue
}
log.Info("Set resourse locker with task " + strconv.Itoa(t.task.ID))
resourceLocker <- &resourceLock{lock: true, holder: t}
if !t.prepared {
go t.prepareRun()
continue
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why do we continue here and not just directly run the task after we prepare it? The next tick will just run the task anyway right?

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nope, without continue it trying to run a task at the same tick with prepare because it checking the lock before this branch

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I should have had a coffee before reviewing this pr 😆
approved

}
go t.run()
p.queue = p.queue[1:]
log.Info("Task " + strconv.Itoa(t.task.ID) + " removed from queue")
}
}
}
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