def get_master(self, handle):
"""Return Job object for master or None if no valid jobs found."""
master = None
# Find jobs with the same handle but with no master,
# these are candidate master jobs. Lock these rows
# so we can ensure they don't get deleted until
# we have a chance to touch it and refcount the selected
# master below
candidates = (Job.objects.select_for_update().filter(
status__in=[Job.NEW, Job.QUEUED, Job.RUNNING, Job.COMPLETE],
handle=handle,
master=None).order_by('created'))
if candidates:
master_jobs = Task.validate_jobs(jobs=candidates, delete=True)
master = master_jobs[0] if master_jobs else None
return master
def get_master(self, handle):
"""Return Job object for master or None if no valid jobs found."""
master = None
# Find jobs with the same handle but with no master,
# these are candidate master jobs. Lock these rows
# so we can ensure they don't get deleted until
# we have a chance to touch it and refcount the selected
# master below
candidates = (Job.objects
.select_for_update()
.filter(status__in=[Job.NEW,
Job.QUEUED,
Job.RUNNING,
Job.COMPLETE],
handle=handle,
master=None)
.order_by('created'))
if candidates:
master_jobs = Task.validate_jobs(jobs=candidates, delete=True)
master = master_jobs[0] if master_jobs else None
return master
