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0e29f3617d
Running orphaned task cleanup within its own scheduled task via celery-beat causes a race-y lock contention between the cleanup task and the task scheduler. Unfortunately, the scheduler and the cleanup task both run at similar intervals, so this race condition is fairly easy to hit. At best, it results in situations where the scheduler is regularly delayed 20s; depending on timing, this can cause situations where task execution is needlessly delayed a minute+. At worst, it can result in situations where the scheduler is never able to schedule tasks. This change implements the cleanup as a periodic block of code in the scheduler itself that tracks its "last run" time in memcached (by default, it performs a cleanup every 60 seconds) see: #6534