docs/history/changelog-3.1.rst
.. _changelog-3.1:
This document contains change notes for bugfix releases in the 3.1.x series
(Cipater), please see :ref:whatsnew-3.1 for an overview of what's
new in Celery 3.1.
.. _version-3.1.26:
:release-date: 2018-23-03 16:00 PM IST :release-by: Omer Katz
.. _version-3.1.25:
:release-date: 2016-10-10 12:00 PM PDT :release-by: Ask Solem
Requirements
Kombu 3.0.37 <kombu:version-3.0.37>Fixed problem with chords in group introduced in 3.1.24 (Issue #3504).
.. _version-3.1.24:
:release-date: 2016-09-30 04:21 PM PDT :release-by: Ask Solem
Requirements
Kombu 3.0.36 <kombu:version-3.0.36>.Now supports Task protocol 2 from the future 4.0 release.
Workers running 3.1.24 are now able to process messages
sent using the new task message protocol_ to be introduced
in Celery 4.0.
Users upgrading to Celery 4.0 when this is released are encouraged to upgrade to this version as an intermediate step, as this means workers not yet upgraded will be able to process messages from clients/workers running 4.0.
.. _new task message protocol:
https://docs.celeryq.dev/en/master/internals/protocol.html#version-2
Task.send_events can now be set to disable sending of events
for that task only.
Example when defining the task:
.. code-block:: python
@app.task(send_events=False)
def add(x, y):
return x + y
Utils: Fixed compatibility with recent :pypi:psutil versions
(Issue #3262).
Canvas: Chord now forwards partial arguments to its subtasks.
Fix contributed by Tayfun Sen.
App: Arguments to app such as backend, broker, etc
are now pickled and sent to the child processes on Windows.
Fix contributed by Jeremy Zafran.
Deployment: Generic init scripts now supports being symlinked in runlevel directories (Issue #3208).
Deployment: Updated CentOS scripts to work with CentOS 7.
Contributed by Joe Sanford.
Events: The curses monitor no longer crashes when the result of a task is empty.
Fix contributed by Dongweiming.
Worker: repr(worker) would crash when called early
in the startup process (Issue #2514).
Tasks: GroupResult now defines bool and nonzero.
This is to fix an issue where a ResultSet or GroupResult with an empty result list are not properly tupled with the as_tuple() method when it is a parent result. This is due to the as_tuple() method performing a logical and operation on the ResultSet.
Fix contributed by Colin McIntosh.
Worker: Fixed wrong values in autoscale related logging message.
Fix contributed by @raducc.
Documentation improvements by
@dessant.. _version-3.1.23:
:release-date: 2016-03-09 06:00 P.M PST :release-by: Ask Solem
Programs: Last release broke support for the --hostnmame argument
to :program:celery multi and :program:celery worker --detach
(Issue #3103).
Results: MongoDB result backend could crash the worker at startup if not configured using an URL.
.. _version-3.1.22:
:release-date: 2016-03-07 01:30 P.M PST :release-by: Ask Solem
Programs: The worker would crash immediately on startup on
backend.as_uri() when using some result backends (Issue #3094).
Programs: :program:celery multi/:program:celery worker --detach
would create an extraneous logfile including literal formats (e.g. %I)
in the filename (Issue #3096).
.. _version-3.1.21:
:release-date: 2016-03-04 11:16 a.m. PST :release-by: Ask Solem
Requirements
Now depends on :ref:Kombu 3.0.34 <kombu:version-3.0.34>.
Now depends on :mod:billiard 3.3.0.23.
Prefork pool: Fixes 100% CPU loop on Linux :manpage:epoll
(Issue #1845).
Also potential fix for: Issue #2142, Issue #2606
Prefork pool: Fixes memory leak related to processes exiting (Issue #2927).
Worker: Fixes crash at start-up when trying to censor passwords in MongoDB and Cache result backend URLs (Issue #3079, Issue #3045, Issue #3049, Issue #3068, Issue #3073).
Fix contributed by Maxime Verger.
Task: An exception is now raised if countdown/expires is less than -2147483648 (Issue #3078).
Programs: :program:celery shell --ipython now compatible with newer
:pypi:IPython versions.
Programs: The DuplicateNodeName warning emitted by inspect/control now includes a list of the node names returned.
Contributed by Sebastian Kalinowski.
Utils: The .discard(item) method of
:class:~celery.utils.collections.LimitedSet didn't actually remove the item
(Issue #3087).
Fix contributed by Dave Smith.
Worker: Node name formatting now emits less confusing error message for unmatched format keys (Issue #3016).
Results: RPC/AMQP backends: Fixed deserialization of JSON exceptions (Issue #2518).
Fix contributed by Allard Hoeve.
Prefork pool: The process inqueue damaged error message now includes
the original exception raised.
Documentation: Includes improvements by:
.. _version-3.1.20:
:release-date: 2016-01-22 06:50 p.m. UTC :release-by: Ask Solem
Requirements
Now depends on :ref:Kombu 3.0.33 <kombu:version-3.0.33>.
Now depends on :mod:billiard 3.3.0.22.
Includes binary wheels for Microsoft Windows x86 and x86_64!
Task: Error emails now uses utf-8 character set by default
(Issue #2737).
Task: Retry now forwards original message headers (Issue #3017).
Worker: Bootsteps can now hook into on_node_join/leave/lost.
See :ref:extending-consumer-attributes for an example.
Events: Fixed handling of DST timezones (Issue #2983).
Results: Redis backend stopped respecting certain settings.
Contributed by Jeremy Llewellyn.
Results: Database backend now properly supports JSON exceptions (Issue #2441).
Results: Redis new_join didn't properly call task errbacks on chord
error (Issue #2796).
Results: Restores Redis compatibility with Python :pypi:redis < 2.10.0
(Issue #2903).
Results: Fixed rare issue with chord error handling (Issue #2409).
Tasks: Using queue-name values in :setting:CELERY_ROUTES now works
again (Issue #2987).
General: Result backend password now sanitized in report output (Issue #2812, Issue #2004).
Configuration: Now gives helpful error message when the result backend configuration points to a module, and not a class (Issue #2945).
Results: Exceptions sent by JSON serialized workers are now properly handled by pickle configured workers.
Programs: celery control autoscale now works (Issue #2950).
Programs: celery beat --detached now runs after fork callbacks.
General: Fix for LRU cache implementation on Python 3.5 (Issue #2897).
Contributed by Dennis Brakhane.
Python 3.5's OrderedDict doesn't allow mutation while it is being
iterated over. This breaks "update" if it is called with a dict
larger than the maximum size.
This commit changes the code to a version that doesn't iterate over the dict, and should also be a little bit faster.
Init-scripts: The beat init-script now properly reports service as down when no pid file can be found.
Eric Zarowny
Beat: Added cleaning of corrupted scheduler files for some storage backend errors (Issue #2985).
Fix contributed by Aleksandr Kuznetsov.
Beat: Now syncs the schedule even if the schedule is empty.
Fix contributed by Colin McIntosh.
Supervisord: Set higher process priority in the :pypi:supervisord
example.
Contributed by George Tantiras.
Documentation: Includes improvements by:
:github_user:Bryson
Caleb Mingle
Christopher Martin
Dieter Adriaenssens
Jason Veatch
Jeremy Cline
Juan Rossi
Kevin Harvey
Kevin McCarthy
Kirill Pavlov
Marco Buttu
:github_user:Mayflower
Mher Movsisyan
Michael Floering
:github_user:michael-k
Nathaniel Varona
Rudy Attias
Ryan Luckie
Steven Parker
:github_user:squfrans
Tadej Janež
TakesxiSximada
Tom S
.. _version-3.1.19:
:release-date: 2015-10-26 01:00 p.m. UTC :release-by: Ask Solem
Requirements
Now depends on :ref:Kombu 3.0.29 <kombu:version-3.0.29>.
Now depends on :mod:billiard 3.3.0.21.
Results: Fixed MongoDB result backend URL parsing problem (Issue celery/kombu#375).
Worker: Task request now properly sets priority in delivery_info.
Fix contributed by Gerald Manipon.
Beat: PyPy shelve may raise KeyError when setting keys
(Issue #2862).
Programs: :program:celery beat --deatched now working on PyPy.
Fix contributed by Krzysztof Bujniewicz.
Results: Redis result backend now ensures all pipelines are cleaned up.
Contributed by Justin Patrin.
Results: Redis result backend now allows for timeout to be set in the query portion of the result backend URL.
For example CELERY_RESULT_BACKEND = 'redis://?timeout=10'
Contributed by Justin Patrin.
Results: result.get now properly handles failures where the
exception value is set to :const:None (Issue #2560).
Prefork pool: Fixed attribute error proc.dead.
Worker: Fixed worker hanging when gossip/heartbeat disabled (Issue #1847).
Fix contributed by Aaron Webber and Bryan Helmig.
Results: MongoDB result backend now supports pymongo 3.x (Issue #2744).
Fix contributed by Sukrit Khera.
Results: RPC/AMQP backends didn't deserialize exceptions properly (Issue #2691).
Fix contributed by Sukrit Khera.
Programs: Fixed problem with :program:celery amqp's
basic_publish (Issue #2013).
Worker: Embedded beat now properly sets app for thread/process (Issue #2594).
Documentation: Many improvements and typos fixed.
Contributions by:
Carlos Garcia-Dubus
D. Yu
:github_user:`jerry`
Jocelyn Delalande
Josh Kupershmidt
Juan Rossi
:github_user:`kanemra`
Paul Pearce
Pavel Savchenko
Sean Wang
Seungha Kim
Zhaorong Ma
.. _version-3.1.18:
:release-date: 2015-04-22 05:30 p.m. UTC :release-by: Ask Solem
Requirements
Now depends on :ref:Kombu 3.0.25 <kombu:version-3.0.25>.
Now depends on :mod:billiard 3.3.0.20.
Django: Now supports Django 1.8 (Issue #2536).
Fix contributed by Bence Tamas and Mickaël Penhard.
Results: MongoDB result backend now compatible with pymongo 3.0.
Fix contributed by Fatih Sucu.
Tasks: Fixed bug only happening when a task has multiple callbacks (Issue #2515).
Fix contributed by NotSqrt.
Commands: Preload options now support --arg value syntax.
Fix contributed by John Anderson.
Compat: A typo caused celery.log.setup_logging_subsystem to be
undefined.
Fix contributed by Gunnlaugur Thor Briem.
init-scripts: The beat generic init-script now uses
:file:/bin/sh instead of :command:bash (Issue #2496).
Fix contributed by Jelle Verstraaten.
Django: Fixed a :exc:TypeError sometimes occurring in logging
when validating models.
Fix contributed by Alexander.
Commands: Worker now supports new
:option:--executable <celery worker --executable> argument that can
be used with :option:celery worker --detach.
Contributed by Bert Vanderbauwhede.
Canvas: Fixed crash in chord unlock fallback task (Issue #2404).
Worker: Fixed rare crash occurring with
:option:--autoscale <celery worker --autoscale> enabled (Issue #2411).
Django: Properly recycle worker Django database connections when the
Django CONN_MAX_AGE setting is enabled (Issue #2453).
Fix contributed by Luke Burden.
.. _version-3.1.17:
:release-date: 2014-11-19 03:30 p.m. UTC :release-by: Ask Solem
.. admonition:: Don't enable the CELERYD_FORCE_EXECV setting!
Please review your configuration and disable this option if you're using the
RabbitMQ or Redis transport.
Keeping this option enabled after 3.1 means the async based prefork pool will
be disabled, which can easily cause instability.
Requirements
Now depends on :ref:Kombu 3.0.24 <kombu:version-3.0.24>.
Includes the new Qpid transport coming in Celery 3.2, backported to support those who may still require Python 2.6 compatibility.
Now depends on :mod:billiard 3.3.0.19.
celery[librabbitmq] now depends on librabbitmq 1.6.1.
Task: The timing of ETA/countdown tasks were off after the example LocalTimezone
implementation in the Python documentation no longer works in Python 3.4.
(Issue #2306).
Task: Raising :exc:~celery.exceptions.Ignore no longer sends
task-failed event (Issue #2365).
Redis result backend: Fixed unbound local errors.
Fix contributed by Thomas French.
Task: Callbacks wasn't called properly if link was a list of
signatures (Issue #2350).
Canvas: chain and group now handles json serialized signatures (Issue #2076).
Results: .join_native() would accidentally treat the STARTED
state as being ready (Issue #2326).
This could lead to the chord callback being called with invalid arguments
when using chords with the :setting:CELERY_TRACK_STARTED setting
enabled.
Canvas: The chord_size attribute is now set for all canvas primitives,
making sure more combinations will work with the new_join optimization
for Redis (Issue #2339).
Task: Fixed problem with app not being properly propagated to
trace_task in all cases.
Fix contributed by :github_user:kristaps.
Worker: Expires from task message now associated with a timezone.
Fix contributed by Albert Wang.
Cassandra result backend: Fixed problems when using detailed mode.
When using the Cassandra backend in detailed mode, a regression caused errors when attempting to retrieve results.
Fix contributed by Gino Ledesma.
Mongodb Result backend: Pickling the backend instance will now include the original URL (Issue #2347).
Fix contributed by Sukrit Khera.
Task: Exception info wasn't properly set for tasks raising
:exc:~celery.exceptions.Reject (Issue #2043).
Worker: Duplicates are now removed when loading the set of revoked tasks from the worker state database (Issue #2336).
celery.contrib.rdb: Fixed problems with rdb.set_trace calling stop
from the wrong frame.
Fix contributed by :github_user:llllllllll.
Canvas: chain and chord can now be immutable.
Canvas: chord.apply_async will now keep partial args set in
self.args (Issue #2299).
Results: Small refactoring so that results are decoded the same way in all result backends.
Logging: The processName format was introduced in Python 2.6.2 so for
compatibility this format is now excluded when using earlier versions
(Issue #1644).
.. _version-3.1.16:
:release-date: 2014-10-03 06:00 p.m. UTC :release-by: Ask Solem
Worker: 3.1.15 broke :option:-Ofair <celery worker -O>
behavior (Issue #2286).
This regression could result in all tasks executing
in a single child process if -Ofair was enabled.
Canvas: celery.signature now properly forwards app argument
in all cases.
Task: .retry() didn't raise the exception correctly
when called without a current exception.
Fix contributed by Andrea Rabbaglietti.
Worker: The enable_events remote control command
disabled worker-related events by mistake (Issue #2272).
Fix contributed by Konstantinos Koukopoulos.
Django: Adds support for Django 1.7 class names in INSTALLED_APPS
when using app.autodiscover_tasks() (Issue #2248).
Sphinx: celery.contrib.sphinx now uses getfullargspec
on Python 3 (Issue #2302).
Redis/Cache Backends: Chords will now run at most once if one or more tasks in the chord are executed multiple times for some reason.
.. _version-3.1.15:
:release-date: 2014-09-14 11:00 p.m. UTC :release-by: Ask Solem
Django: Now makes sure django.setup() is called
before importing any task modules (Django 1.7 compatibility, Issue #2227)
Results: result.get() was misbehaving by calling
backend.get_task_meta in a :keyword:finally call leading to
AMQP result backend queues not being properly cleaned up (Issue #2245).
.. _version-3.1.14:
:release-date: 2014-09-08 03:00 p.m. UTC :release-by: Ask Solem
Requirements
Kombu 3.0.22 <kombu:version-3.0.22>.Init-scripts: The generic worker init-scripts status command
now gets an accurate pidfile list (Issue #1942).
Init-scripts: The generic beat script now implements the status
command.
Contributed by John Whitlock.
Commands: Multi now writes informational output to stdout instead of stderr.
Worker: Now ignores not implemented error for pool.restart
(Issue #2153).
Task: Retry no longer raises retry exception when executed in eager mode (Issue #2164).
AMQP Result backend: Now ensured on_interval is called at least
every second for blocking calls to properly propagate parent errors.
Django: Compatibility with Django 1.7 on Windows (Issue #2126).
Programs: :option:!--umask argument can now be
specified in both octal (if starting with 0) or decimal.
.. _version-3.1.13:
[Security: CELERYSA-0002_] Insecure default umask.
The built-in utility used to daemonize the Celery worker service sets an insecure umask by default (umask 0).
This means that any files or directories created by the worker will end up having world-writable permissions.
Special thanks to Red Hat for originally discovering and reporting the issue!
This version will no longer set a default umask by default, so if unset the umask of the parent process will be used.
.. _CELERYSA-0002:
https://github.com/celery/celery/tree/master/docs/sec/CELERYSA-0002.txt
Requirements
Now depends on :ref:Kombu 3.0.21 <kombu:version-3.0.21>.
Now depends on :mod:billiard 3.3.0.18.
App: backend argument now also sets the :setting:CELERY_RESULT_BACKEND
setting.
Task: signature_from_request now propagates reply_to so that
the RPC backend works with retried tasks (Issue #2113).
Task: retry will no longer attempt to re-queue the task if sending
the retry message fails.
Unrelated exceptions being raised could cause a message loop, so it was better to remove this behavior.
Beat: Accounts for standard 1ms drift by always waking up 0.010s earlier.
This will adjust the latency so that the periodic tasks won't move 1ms after every invocation.
Documentation fixes
Contributed by Yuval Greenfield, Lucas Wiman, :github_user:nicholsonjf.
Worker: Removed an outdated assert statement that could lead to errors being masked (Issue #2086).
.. _version-3.1.12:
:release-date: 2014-06-09 10:12 p.m. UTC :release-by: Ask Solem
Requirements
Now depends on :ref:Kombu 3.0.19 <kombu:version-3.0.19>.
App: Connections weren't being closed after fork due to an error in the after fork handler (Issue #2055).
This could manifest itself by causing framing errors when using RabbitMQ.
(Unexpected frame).
Django: django.setup() was being called too late when
using Django 1.7 (Issue #1802).
Django: Fixed problems with event timezones when using Django
(Substantial drift).
Celery didn't take into account that Django modifies the
time.timeone attributes and friends.
Canvas: Signature.link now works when the link option is a scalar
value (Issue #2019).
Prefork pool: Fixed race conditions for when file descriptors are removed from the event loop.
Fix contributed by Roger Hu.
Prefork pool: Improved solution for dividing tasks between child processes.
This change should improve performance when there are many child processes, and also decrease the chance that two subsequent tasks are written to the same child process.
Worker: Now ignores unknown event types, instead of crashing.
Fix contributed by Illes Solt.
Programs: :program:celery worker --detach no longer closes open file
descriptors when :envvar:C_FAKEFORK is used so that the workers output
can be seen.
Programs: The default working directory for :program:celery worker --detach is now the current working directory, not /.
Canvas: signature(s, app=app) didn't upgrade serialized signatures
to their original class (subtask_type) when the app keyword argument
was used.
Control: The duplicate nodename warning emitted by control commands
now shows the duplicate node name.
Tasks: Can now call ResultSet.get() on a result set without members.
Fix contributed by Alexey Kotlyarov.
App: Fixed strange traceback mangling issue for
app.connection_or_acquire.
Programs: The :program:celery multi stopwait command is now documented
in usage.
Other: Fixed cleanup problem with PromiseProxy when an error is
raised while trying to evaluate the promise.
Other: The utility used to censor configuration values now handles non-string keys.
Fix contributed by Luke Pomfrey.
Other: The inspect conf command didn't handle non-string keys well.
Fix contributed by Jay Farrimond.
Programs: Fixed argument handling problem in
:program:celery worker --detach.
Fix contributed by Dmitry Malinovsky.
Programs: :program:celery worker --detach didn't forward working
directory option (Issue #2003).
Programs: :program:celery inspect registered no longer includes
the list of built-in tasks.
Worker: The requires attribute for boot steps weren't being handled
correctly (Issue #2002).
Eventlet: The eventlet pool now supports the pool_grow and
pool_shrink remote control commands.
Contributed by Mher Movsisyan.
Eventlet: The eventlet pool now implements statistics for
:program:celery inspect stats.
Contributed by Mher Movsisyan.
Documentation: Clarified Task.rate_limit behavior.
Contributed by Jonas Haag.
Documentation: AbortableTask examples now updated to use the new
API (Issue #1993).
Documentation: The security documentation examples used an out of date import.
Fix contributed by Ian Dees.
Init-scripts: The CentOS init-scripts didn't quote
:envvar:CELERY_CHDIR.
Fix contributed by :github_user:ffeast.
.. _version-3.1.11:
:release-date: 2014-04-16 11:00 p.m. UTC :release-by: Ask Solem
Now compatible with RabbitMQ 3.3.0
You need to run Celery 3.1.11 or later when using RabbitMQ 3.3,
and if you use the librabbitmq module you also have to upgrade
to librabbitmq 1.5.0:
.. code-block:: bash
$ pip install -U librabbitmq
Requirements:
Now depends on :ref:Kombu 3.0.15 <kombu:version-3.0.15>.
Now depends on billiard 3.3.0.17_.
Bundle celery[librabbitmq] now depends on :mod:librabbitmq 1.5.0.
.. _billiard 3.3.0.17:
https://github.com/celery/billiard/blob/master/CHANGES.txt
Tasks: The :setting:CELERY_DEFAULT_DELIVERY_MODE setting was being
ignored (Issue #1953).
Worker: New :option:celery worker --heartbeat-interval can be used
to change the time (in seconds) between sending event heartbeats.
Contributed by Matthew Duggan and Craig Northway.
App: Fixed memory leaks occurring when creating lots of temporary app instances (Issue #1949).
MongoDB: SSL configuration with non-MongoDB transport breaks MongoDB results backend (Issue #1973).
Fix contributed by Brian Bouterse.
Logging: The color formatter accidentally modified record.msg
(Issue #1939).
Results: Fixed problem with task trails being stored multiple times,
causing result.collect() to hang (Issue #1936, Issue #1943).
Results: ResultSet now implements a .backend attribute for
compatibility with AsyncResult.
Results: .forget() now also clears the local cache.
Results: Fixed problem with multiple calls to result._set_cache
(Issue #1940).
Results: join_native populated result cache even if disabled.
Results: The YAML result serializer should now be able to handle storing exceptions.
Worker: No longer sends task error emails for expected errors (in
@task(throws=(..., ))).
Canvas: Fixed problem with exception deserialization when using the JSON serializer (Issue #1987).
Eventlet: Fixes crash when celery.contrib.batches attempted to
cancel a non-existing timer (Issue #1984).
Can now import celery.version_info_t, and celery.five (Issue #1968).
.. _version-3.1.10:
:release-date: 2014-03-22 09:40 p.m. UTC :release-by: Ask Solem
Requirements:
Kombu 3.0.14 <kombu:version-3.0.14>.Results:
Reliability improvements to the SQLAlchemy database backend. Previously the connection from the MainProcess was improperly shared with the workers. (Issue #1786)
Redis: Important note about events (Issue #1882).
There's a new transport option for Redis that enables monitors to filter out unwanted events. Enabling this option in the workers will increase performance considerably:
.. code-block:: python
BROKER_TRANSPORT_OPTIONS = {'fanout_patterns': True}
Enabling this option means that your workers won't be able to see workers with the option disabled (or is running an older version of Celery), so if you do enable it then make sure you do so on all nodes.
See :ref:redis-caveats.
This will be the default in Celery 3.2.
Results: The :class:@AsyncResult object now keeps a local cache
of the final state of the task.
This means that the global result cache can finally be disabled,
and you can do so by setting :setting:CELERY_MAX_CACHED_RESULTS to
:const:-1. The lifetime of the cache will then be bound to the
lifetime of the result object, which will be the default behavior
in Celery 3.2.
Events: The "Substantial drift" warning message is now logged once per node name only (Issue #1802).
Worker: Ability to use one log file per child process when using the prefork pool.
This can be enabled by using the new %i and %I format specifiers
for the log file name. See :ref:worker-files-process-index.
Redis: New experimental chord join implementation.
This is an optimization for chords when using the Redis result backend, where the join operation is now considerably faster and using less resources than the previous strategy.
The new option can be set in the result backend URL:
.. code-block:: python
CELERY_RESULT_BACKEND = 'redis://localhost?new_join=1'
This must be enabled manually as it's incompatible with workers and clients not using it, so be sure to enable the option in all clients and workers if you decide to use it.
Multi: With -opt:index (e.g., -c:1) the index now always refers
to the position of a node in the argument list.
This means that referring to a number will work when specifying a list of node names and not just for a number range:
.. code-block:: bash
celery multi start A B C D -c:1 4 -c:2-4 8
In this example 1 refers to node A (as it's the first node in the
list).
Signals: The sender argument to Signal.connect can now be a proxy
object, which means that it can be used with the task decorator
(Issue #1873).
Task: A regression caused the queue argument to Task.retry to be
ignored (Issue #1892).
App: Fixed error message for :meth:[email protected]_from_envvar.
Fix contributed by Dmitry Malinovsky.
Canvas: Chords can now contain a group of other chords (Issue #1921).
Canvas: Chords can now be combined when using the amqp result backend (a chord where the callback is also a chord).
Canvas: Calling result.get() for a chain task will now complete
even if one of the tasks in the chain is ignore_result=True
(Issue #1905).
Canvas: Worker now also logs chord errors.
Canvas: A chord task raising an exception will now result in
any errbacks (link_error) to the chord callback to also be called.
Results: Reliability improvements to the SQLAlchemy database backend (Issue #1786).
Previously the connection from the MainProcess was improperly
inherited by child processes.
Fix contributed by Ionel Cristian Mărieș.
Task: Task callbacks and errbacks are now called using the group primitive.
Task: Task.apply now properly sets request.headers
(Issue #1874).
Worker: Fixed :exc:UnicodeEncodeError occurring when worker is started
by :pypi:supervisor.
Fix contributed by Codeb Fan.
Beat: No longer attempts to upgrade a newly created database file (Issue #1923).
Beat: New setting :setting:CELERYBEAT_SYNC_EVERY can be used
to control file sync by specifying the number of tasks to send between
each sync.
Contributed by Chris Clark.
Commands: :program:celery inspect memdump no longer crashes
if the :mod:psutil module isn't installed (Issue #1914).
Worker: Remote control commands now always accepts json serialized messages (Issue #1870).
Worker: Gossip will now drop any task related events it receives by mistake (Issue #1882).
.. _version-3.1.9:
:release-date: 2014-02-10 06:43 p.m. UTC :release-by: Ask Solem
Requirements:
Kombu 3.0.12 <kombu:version-3.0.12>.Prefork pool: Better handling of exiting child processes.
Fix contributed by Ionel Cristian Mărieș.
Prefork pool: Now makes sure all file descriptors are removed from the hub when a process is cleaned up.
Fix contributed by Ionel Cristian Mărieș.
New Sphinx extension: for autodoc documentation of tasks:
:mod:celery.contrib.spinx (Issue #1833).
Django: Now works with Django 1.7a1.
Task: Task.backend is now a property that forwards to app.backend
if no custom backend has been specified for the task (Issue #1821).
Generic init-scripts: Fixed bug in stop command.
Fix contributed by Rinat Shigapov.
Generic init-scripts: Fixed compatibility with GNU :manpage:stat.
Fix contributed by Paul Kilgo.
Generic init-scripts: Fixed compatibility with the minimal
:program:dash shell (Issue #1815).
Commands: The :program:celery amqp basic.publish command wasn't
working properly.
Fix contributed by Andrey Voronov.
Commands: Did no longer emit an error message if the pidfile exists and the process is still alive (Issue #1855).
Commands: Better error message for missing arguments to preload options (Issue #1860).
Commands: :program:celery -h didn't work because of a bug in the
argument parser (Issue #1849).
Worker: Improved error message for message decoding errors.
Time: Now properly parses the Z timezone specifier in ISO 8601 date
strings.
Fix contributed by Martin Davidsson.
Worker: Now uses the negotiated heartbeat value to calculate how often to run the heartbeat checks.
Beat: Fixed problem with beat hanging after the first schedule iteration (Issue #1822).
Fix contributed by Roger Hu.
Signals: The header argument to :signal:before_task_publish is now
always a dictionary instance so that signal handlers can add headers.
Worker: A list of message headers is now included in message related errors.
.. _version-3.1.8:
:release-date: 2014-01-17 10:45 p.m. UTC :release-by: Ask Solem
Requirements:
Now depends on :ref:Kombu 3.0.10 <kombu:version-3.0.10>.
Now depends on billiard 3.3.0.14_.
.. _billiard 3.3.0.14:
https://github.com/celery/billiard/blob/master/CHANGES.txt
Worker: The event loop wasn't properly reinitialized at consumer restart
which would force the worker to continue with a closed epoll instance on
Linux, resulting in a crash.
Events: Fixed issue with both heartbeats and task events that could result in the data not being kept in sorted order.
As a result this would force the worker to log "heartbeat missed" events even though the remote node was sending heartbeats in a timely manner.
Results: The pickle serializer no longer converts group results to tuples, and will keep the original type (Issue #1750).
Results: ResultSet.iterate is now pending deprecation.
The method will be deprecated in version 3.2 and removed in version 3.3.
Use result.get(callback=) (or result.iter_native() where available)
instead.
Worker|eventlet/gevent: A regression caused :kbd:Control-c to be
ineffective for shutdown.
Redis result backend: Now using a pipeline to store state changes for improved performance.
Contributed by Pepijn de Vos.
Redis result backend: Will now retry storing the result if disconnected.
Worker|gossip: Fixed attribute error occurring when another node leaves.
Fix contributed by Brodie Rao.
Generic init-scripts: Now runs a check at start-up to verify that any configuration scripts are owned by root and that they aren't world/group writable.
The init-script configuration is a shell script executed by root, so this is a preventive measure to ensure that users don't leave this file vulnerable to changes by unprivileged users.
.. note::
Note that upgrading Celery won't update the init-scripts,
instead you need to manually copy the improved versions from the
source distribution:
https://github.com/celery/celery/tree/3.1/extra/generic-init.d
Commands: The :program:celery purge command now warns that the operation
will delete all tasks and prompts the user for confirmation.
A new :option:-f <celery purge -f> was added that can be used to disable
interactive mode.
Task: .retry() didn't raise the value provided in the exc argument
when called outside of an error context (Issue #1755).
Commands: The :program:celery multi command didn't forward command
line configuration to the target workers.
The change means that multi will forward the special -- argument and
configuration content at the end of the arguments line to the specified
workers.
Example using command-line configuration to set a broker heartbeat
from :program:celery multi:
.. code-block:: bash
$ celery multi start 1 -c3 -- broker.heartbeat=30
Fix contributed by Antoine Legrand.
Canvas: chain.apply_async() now properly forwards execution options.
Fix contributed by Konstantin Podshumok.
Redis result backend: Now takes connection_pool argument that can be
used to change the connection pool class/constructor.
Worker: Now truncates very long arguments and keyword arguments logged by the pool at debug severity.
Worker: The worker now closes all open files on :sig:SIGHUP (regression)
(Issue #1768).
Fix contributed by Brodie Rao
Worker: Will no longer accept remote control commands while the worker start-up phase is incomplete (Issue #1741).
Commands: The output of the event dump utility
(:program:celery events -d) can now be piped into other commands.
Documentation: The RabbitMQ installation instructions for macOS was updated to use modern Homebrew practices.
Contributed by Jon Chen.
Commands: The :program:celery inspect conf utility now works.
Commands: The :option:--no-color <celery --no-color> argument was
not respected by all commands (Issue #1799).
App: Fixed rare bug with autodiscover_tasks() (Issue #1797).
Distribution: The sphinx docs will now always add the parent directory to path so that the current Celery source code is used as a basis for API documentation (Issue #1782).
Documentation: :pypi:supervisor examples contained an
extraneous '-' in a :option:--logfile <celery worker --logfile> argument
example.
Fix contributed by Mohammad Almeer.
.. _version-3.1.7:
:release-date: 2013-12-17 06:00 p.m. UTC :release-by: Ask Solem
.. _v317-important:
Where the generic init-scripts (for celeryd, and celerybeat) before
delegated the responsibility of dropping privileges to the target application,
it will now use su instead, so that the Python program isn't trusted
with superuser privileges.
This isn't in reaction to any known exploit, but it will limit the possibility of a privilege escalation bug being abused in the future.
You have to upgrade the init-scripts manually from this directory: https://github.com/celery/celery/tree/3.1/extra/generic-init.d
AMQP result backend
The 3.1 release accidentally left the amqp backend configured to be
non-persistent by default.
Upgrading from 3.0 would give a "not equivalent" error when attempting to
set or retrieve results for a task. That's unless you manually set the
persistence setting::
CELERY_RESULT_PERSISTENT = True
This version restores the previous value so if you already forced
the upgrade by removing the existing exchange you must either
keep the configuration by setting ``CELERY_RESULT_PERSISTENT = False``
or delete the ``celeryresults`` exchange again.
Synchronous subtasks
Tasks waiting for the result of a subtask will now emit
a :exc:RuntimeWarning warning when using the prefork pool,
and in 3.2 this will result in an exception being raised.
It's not legal for tasks to block by waiting for subtasks
as this is likely to lead to resource starvation and eventually
deadlock when using the prefork pool (see also :ref:task-synchronous-subtasks).
If you really know what you're doing you can avoid the warning (and the future exception being raised) by moving the operation in a white-list block:
.. code-block:: python
from celery.result import allow_join_result
@app.task
def misbehaving():
result = other_task.delay()
with allow_join_result():
result.get()
Note also that if you wait for the result of a subtask in any form
when using the prefork pool you must also disable the pool prefetching
behavior with the worker :ref:-Ofair option <optimizing-prefetch-limit>.
.. _v317-fixes:
Now depends on :ref:Kombu 3.0.8 <kombu:version-3.0.8>.
Now depends on :mod:billiard 3.3.0.13
Events: Fixed compatibility with non-standard json libraries
that sends float as :class:decimal.Decimal (Issue #1731)
Events: State worker objects now always defines attributes:
active, processed, loadavg, sw_ident, sw_ver
and sw_sys.
Worker: Now keeps count of the total number of tasks processed,
not just by type (all_active_count).
Init-scripts: Fixed problem with reading configuration file
when the init-script is symlinked to a runlevel (e.g., S02celeryd).
(Issue #1740).
This also removed a rarely used feature where you can symlink the script
to provide alternative configurations. You instead copy the script
and give it a new name, but perhaps a better solution is to provide
arguments to CELERYD_OPTS to separate them:
.. code-block:: bash
CELERYD_NODES="X1 X2 Y1 Y2"
CELERYD_OPTS="-A:X1 x -A:X2 x -A:Y1 y -A:Y2 y"
Fallback chord unlock task is now always called after the chord header (Issue #1700).
This means that the unlock task won't be started if there's an error sending the header.
Celery command: Fixed problem with arguments for some control commands.
Fix contributed by Konstantin Podshumok.
Fixed bug in utcoffset where the offset when in DST would be
completely wrong (Issue #1743).
Worker: Errors occurring while attempting to serialize the result of a
task will now cause the task to be marked with failure and a
:class:kombu.exceptions.EncodingError error.
Fix contributed by Ionel Cristian Mărieș.
Worker with :option:-B <celery worker -B> argument didn't properly
shut down the beat instance.
Worker: The %n and %h formats are now also supported by the
:option:--logfile <celery worker --logfile>,
:option:--pidfile <celery worker --pidfile> and
:option:--statedb <celery worker --statedb> arguments.
Example:
.. code-block:: bash
$ celery -A proj worker -n foo@%h --logfile=%n.log --statedb=%n.db
Redis/Cache result backends: Will now timeout if keys evicted while trying to join a chord.
The fallback unlock chord task now raises :exc:Retry so that the
retry even is properly logged by the worker.
Multi: Will no longer apply Eventlet/gevent monkey patches (Issue #1717).
Redis result backend: Now supports UNIX sockets.
Like the Redis broker transport the result backend now also supports
using redis+socket:///tmp/redis.sock URLs.
Contributed by Alcides Viamontes Esquivel.
Events: Events sent by clients was mistaken for worker related events (Issue #1714).
For events.State the tasks now have a Task.client attribute
that's set when a task-sent event is being received.
Also, a clients logical clock isn't in sync with the cluster so they live in a "time bubble." So for this reason monitors will no longer attempt to merge with the clock of an event sent by a client, instead it will fake the value by using the current clock with a skew of -1.
Prefork pool: The method used to find terminated processes was flawed
in that it didn't also take into account missing popen objects.
Canvas: group and chord now works with anon signatures as long
as the group/chord object is associated with an app instance (Issue #1744).
You can pass the app by using group(..., app=app).
.. _version-3.1.6:
:release-date: 2013-12-02 06:00 p.m. UTC :release-by: Ask Solem
Now depends on :mod:billiard 3.3.0.10.
Now depends on :ref:Kombu 3.0.7 <kombu:version-3.0.7>.
Fixed problem where Mingle caused the worker to hang at start-up (Issue #1686).
Beat: Would attempt to drop privileges twice (Issue #1708).
Windows: Fixed error with geteuid not being available (Issue #1676).
Tasks can now provide a list of expected error classes (Issue #1682).
The list should only include errors that the task is expected to raise during normal operation::
@task(throws=(KeyError, HttpNotFound))
What happens when an exceptions is raised depends on the type of error:
Expected errors (included in Task.throws)
Will be logged using severity INFO, and traceback is excluded.
Unexpected errors
Will be logged using severity ERROR, with traceback included.
Cache result backend now compatible with Python 3 (Issue #1697).
CentOS init-script: Now compatible with SysV style init symlinks.
Fix contributed by Jonathan Jordan.
Events: Fixed problem when task name isn't defined (Issue #1710).
Fix contributed by Mher Movsisyan.
Task: Fixed unbound local errors (Issue #1684).
Fix contributed by Markus Ullmann.
Canvas: Now unrolls groups with only one task (optimization) (Issue #1656).
Task: Fixed problem with ETA and timezones.
Fix contributed by Alexander Koval.
Django: Worker now performs model validation (Issue #1681).
Task decorator now emits less confusing errors when used with incorrect arguments (Issue #1692).
Task: New method Task.send_event can be used to send custom events
to Flower and other monitors.
Fixed a compatibility issue with non-abstract task classes
Events from clients now uses new node name format (gen<pid>@<hostname>).
Fixed rare bug with Callable not being defined at interpreter shutdown (Issue #1678).
Fix contributed by Nick Johnson.
Fixed Python 2.6 compatibility (Issue #1679).
.. _version-3.1.5:
:release-date: 2013-11-21 06:20 p.m. UTC :release-by: Ask Solem
Now depends on :ref:Kombu 3.0.6 <kombu:version-3.0.6>.
Now depends on :mod:billiard 3.3.0.8
App: config_from_object is now lazy (Issue #1665).
App: autodiscover_tasks is now lazy.
Django users should now wrap access to the settings object in a lambda::
app.autodiscover_tasks(lambda: settings.INSTALLED_APPS)
this ensures that the settings object isn't prepared prematurely.
Fixed regression for :option:--app <celery --app> argument
experienced by some users (Issue #1653).
Worker: Now respects the :option:--uid <celery worker --uid> and
:option:--gid <celery worker --gid> arguments even if
:option:--detach <celery worker --detach> isn't enabled.
Beat: Now respects the :option:--uid <celery beat --uid> and
:option:--gid <celery beat --gid> arguments even if
:option:--detach <celery beat --detach> isn't enabled.
Python 3: Fixed unorderable error occurring with the worker
:option:-B <celery worker -B> argument enabled.
celery.VERSION is now a named tuple.
maybe_signature(list) is now applied recursively (Issue #1645).
celery shell command: Fixed IPython.frontend deprecation warning.
The default app no longer includes the built-in fix-ups.
This fixes a bug where celery multi would attempt
to load the Django settings module before entering
the target working directory.
The Django daemonization tutorial was changed.
Users no longer have to explicitly export DJANGO_SETTINGS_MODULE
in :file:/etc/default/celeryd when the new project layout is used.
Redis result backend: expiry value can now be 0 (Issue #1661).
Censoring settings now accounts for non-string keys (Issue #1663).
App: New autofinalize option.
Apps are automatically finalized when the task registry is accessed. You can now disable this behavior so that an exception is raised instead.
Example:
.. code-block:: python
app = Celery(autofinalize=False)
# raises RuntimeError
tasks = app.tasks
@app.task
def add(x, y):
return x + y
# raises RuntimeError
add.delay(2, 2)
app.finalize()
# no longer raises:
tasks = app.tasks
add.delay(2, 2)
The worker didn't send monitoring events during shutdown.
Worker: Mingle and gossip is now automatically disabled when used with an unsupported transport (Issue #1664).
celery command: Preload options now supports
the rare --opt value format (Issue #1668).
celery command: Accidentally removed options
appearing before the sub-command, these are now moved to the end
instead.
Worker now properly responds to inspect stats commands
even if received before start-up is complete (Issue #1659).
:signal:task_postrun is now sent within a :keyword:finally block,
to make sure the signal is always sent.
Beat: Fixed syntax error in string formatting.
Contributed by :github_user:nadad.
Fixed typos in the documentation.
Fixes contributed by Loic Bistuer, :github_user:sunfinite.
Nested chains now works properly when constructed using the
chain type instead of the | operator (Issue #1656).
.. _version-3.1.4:
:release-date: 2013-11-15 11:40 p.m. UTC :release-by: Ask Solem
Now depends on :ref:Kombu 3.0.5 <kombu:version-3.0.5>.
Now depends on :mod:billiard 3.3.0.7
Worker accidentally set a default socket timeout of 5 seconds.
Django: Fix-up now sets the default app so that threads will use
the same app instance (e.g., for :command:manage.py runserver).
Worker: Fixed Unicode error crash at start-up experienced by some users.
Calling .apply_async on an empty chain now works again (Issue #1650).
The celery multi show command now generates the same arguments
as the start command does.
The :option:--app <celery --app> argument could end up using a module
object instead of an app instance (with a resulting crash).
Fixed a syntax error problem in the beat init-script.
Fix contributed by Vsevolod.
Tests now passing on PyPy 2.1 and 2.2.
.. _version-3.1.3:
:release-date: 2013-11-13 00:55 a.m. UTC :release-by: Ask Solem
Fixed compatibility problem with Python 2.7.0 - 2.7.5 (Issue #1637)
unpack_from started supporting memoryview arguments
in Python 2.7.6.
Worker: :option:-B <celery worker -B> argument accidentally closed
files used for logging.
Task decorated tasks now keep their docstring (Issue #1636)
.. _version-3.1.2:
:release-date: 2013-11-12 08:00 p.m. UTC :release-by: Ask Solem
Now depends on :mod:billiard 3.3.0.6
No longer needs the billiard C extension to be installed.
The worker silently ignored task errors.
Django: Fixed ImproperlyConfigured error raised
when no database backend specified.
Fix contributed by :github_user:j0hnsmith.
Prefork pool: Now using _multiprocessing.read with memoryview
if available.
close_open_fds now uses os.closerange if available.
get_fdmax now takes value from sysconfig if possible.
.. _version-3.1.1:
:release-date: 2013-11-11 06:30 p.m. UTC :release-by: Ask Solem
Now depends on :mod:billiard 3.3.0.4.
Python 3: Fixed compatibility issues.
Windows: Accidentally showed warning that the billiard C extension wasn't installed (Issue #1630).
Django: Tutorial updated with a solution that sets a default
:envvar:DJANGO_SETTINGS_MODULE so that it doesn't have to be typed
in with the :program:celery command.
Also fixed typos in the tutorial, and added the settings required to use the Django database backend.
Thanks to Chris Ward, :github_user:orarbel.
Django: Fixed a problem when using the Django settings in Django 1.6.
Django: Fix-up shouldn't be applied if the django loader is active.
Worker: Fixed attribute error for human_write_stats when using the
compatibility prefork pool implementation.
Worker: Fixed compatibility with billiard without C extension.
Inspect.conf: Now supports a with_defaults argument.
Group.restore: The backend argument wasn't respected.
.. _version-3.1.0:
:release-date: 2013-11-09 11:00 p.m. UTC :release-by: Ask Solem
See :ref:whatsnew-3.1.