Appengine Runs Failed Tasks Twice Even If Task_retry_limit=0

I'm seeing a buggy behaviour in taskqueue API. When a task fails, appengine always runs it once again, even if I tell it not to. This is the relevant code: NO_RETRY = TaskRetryOpti

Solution 1:

As mentioned in the documentation App Engine will sometimes run a task twice. You should write your tasks to ensure that this will not be harmful.

Solution 2:

I just found a way to avoid the undesired retry:

taskqueue.add(
    url='/blah',
    queue_name='myq',
    retry_options=TaskRetryOptions(task_retry_limit=0, task_age_limit=1),
    countdown=1,
)

This combination of of retry_limit, age_limit and countdown is the magical incantation that does the trick.

It's still suboptimal though, so I'll leave this without a green answer until google fixes this bug.

Solution 3:

Check your queue.yaml file and make sure it is correctly configured.

queue:-name:defaultretry_parameters:task_retry_limit:0