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This document contains change notes for bugfix & new features in the 5.0.x series, please see :ref:`whatsnew-5.0` for an overview of what's new in Celery 5.0.

5.0.5

release-date:2020-12-16 5.35 P.M UTC+2:00
release-by:Omer Katz
  • Ensure keys are strings when deleting results from S3 (#6537).
  • Fix a regression breaking celery --help and celery events (#6543).

5.0.4

release-date:2020-12-08 2.40 P.M UTC+2:00
release-by:Omer Katz

  • DummyClient of cache+memory:// backend now shares state between threads (#6524).

    This fixes a problem when using our pytest integration with the in memory result backend. Because the state wasn't shared between threads, #6416 results in test suites hanging on result.get().

5.0.3

release-date:2020-12-03 6.30 P.M UTC+2:00
release-by:Omer Katz
  • Make --workdir eager for early handling (#6457).
  • When using the MongoDB backend, don't cleanup if result_expires is 0 or None (#6462).
  • Fix passing queues into purge command (#6469).
  • Restore app.start() and app.worker_main() (#6481).
  • Detaching no longer creates an extra log file (#6426).
  • Result backend instances are now thread local to ensure thread safety (#6416).
  • Don't upgrade click to 8.x since click-repl doesn't support it yet.
  • Restore preload options (#6516).

5.0.2

release-date:2020-11-02 8.00 P.M UTC+2:00
release-by:Omer Katz

  • Fix _autodiscover_tasks_from_fixups (#6424).

  • Flush worker prints, notably the banner (#6432).

  • Breaking Change: Remove ha_policy from queue definition. (#6440)

    This argument has no effect since RabbitMQ 3.0. Therefore, We feel comfortable dropping it in a patch release.

  • Python 3.9 support (#6418).

  • Regression: When using the prefork pool, pick the fair scheduling strategy by default (#6447).

  • Preserve callbacks when replacing a task with a chain (#6189).

  • Fix max_retries override on self.retry() (#6436).

  • Raise proper error when replacing with an empty chain (#6452)

5.0.1

release-date:2020-10-18 1.00 P.M UTC+3:00
release-by:Omer Katz
  • Specify UTF-8 as the encoding for log files (#6357).
  • Custom headers now propagate when using the protocol 1 hybrid messages (#6374).
  • Retry creating the database schema for the database results backend in case of a race condition (#6298).
  • When using the Redis results backend, awaiting for a chord no longer hangs when setting :setting:`result_expires` to 0 (#6373).
  • When a user tries to specify the app as an option for the subcommand, a custom error message is displayed (#6363).
  • Fix the --without-gossip, --without-mingle, and --without-heartbeat options which now work as expected. (#6365)
  • Provide a clearer error message when the application cannot be loaded.
  • Avoid printing deprecation warnings for settings when they are loaded from Django settings (#6385).
  • Allow lowercase log levels for the --loglevel option (#6388).
  • Detaching now works as expected (#6401).
  • Restore broadcasting messages from celery control (#6400).
  • Pass back real result for single task chains (#6411).
  • Ensure group tasks a deeply serialized (#6342).
  • Fix chord element counting (#6354).
  • Restore the celery shell command (#6421).

5.0.0

release-date:2020-09-24 6.00 P.M UTC+3:00
release-by:Omer Katz
  • Breaking Change Remove AMQP result backend (#6360).
  • Warn when deprecated settings are used (#6353).
  • Expose retry_policy for Redis result backend (#6330).
  • Prepare Celery to support the yet to be released Python 3.9 (#6328).

5.0.0rc3

release-date:2020-09-07 4.00 P.M UTC+3:00
release-by:Omer Katz
  • More cleanups of leftover Python 2 support (#6338).

5.0.0rc2

release-date:2020-09-01 6.30 P.M UTC+3:00
release-by:Omer Katz
  • Bump minimum required eventlet version to 0.26.1.
  • Update Couchbase Result backend to use SDK V3.
  • Restore monkeypatching when gevent or eventlet are used.

5.0.0rc1

release-date:2020-08-24 9.00 P.M UTC+3:00
release-by:Omer Katz
  • Allow to opt out of ordered group results when using the Redis result backend (#6290).
  • Breaking Change Remove the deprecated celery.utils.encoding module.

5.0.0b1

release-date:2020-08-19 8.30 P.M UTC+3:00
release-by:Omer Katz
  • Breaking Change Drop support for the Riak result backend (#5686).
  • Breaking Change pytest plugin is no longer enabled by default (#6288). Install pytest-celery to enable it.
  • Breaking Change Brand new CLI based on Click (#5718).

5.0.0a2

release-date:2020-08-05 7.15 P.M UTC+3:00
release-by:Omer Katz
  • Bump Kombu version to 5.0 (#5686).

5.0.0a1

release-date:2020-08-02 9.30 P.M UTC+3:00
release-by:Omer Katz
  • Removed most of the compatibility code that supports Python 2 (#5686).
  • Modernized code to work on Python 3.6 and above (#5686).