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[SE-4860] cherry-pick configuration/pull/6586 - #185
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Other squashed commit messages: fix: celery 5.0+ does not support --app as a worker flag refactor: remove duplicated app declaration fix: --config flag is global since Celery 5.0+ fix: replace single-beat with an updated version fix: add missing comma fix: replace maxtasksperchild worker flag refactor: address PR review comments refactor: remove celery<5 adjustments fix: set single-beat autorestart Signed-off-by: Gabor Boros <gabor.brs@gmail.com>
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Description
Cherry-pick of openedx-unsupported#6586
This PR allows setting separate users for single-beat and celery brokers, allows authentication, and setting the single-beat identifier for future fine-grained access control using Redis ACLs.
Also, we are replacing the source url of the package, hence the original code became outdated and
akachanov:masteris ahead of the original repo by fixing issues and removing incompatible code.Supporting information
Some months ago edX platform was not capable of doing periodic scheduling of celery tasks. Therefore we added celerybeat to the platform. The only issue with celerybeat is that it cannot run more than once. If multiple celerybeat schedulers are running at the same time, the same task can be scheduled multiple times resulting in unwanted behaviours. Here comes
single-beatinto picture that ensures (using redis) that no more than one celerybeat processes are running.Akachanov removed Tornadis that was published in 2018 for the last time and broke with the newest Celery. Using Akachanov's fork ensures that single-beat is still working with the newest Celery and he also seems to fixed some reconnect issues -- I assume hence the celerybeat process restarts, since I cannot see any errors and periodically scheduled tasks are processed as expected.