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.. _changelog:
================
Change history
================
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-3.1.24:
3.1.24
======
:release-date: 2016-09-30 04:21 PM PDT
:release-by: Ask Solem
- **Requirements**
- Now depends on :ref:`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`:
http://docs.celeryproject.org/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
* Alexandru Chirila
* Michael Aquilina
* Mikko Ekström
* Mitchel Humpherys
* Thomas A. Neil
* Tiago Moreira Vieira
* Yuriy Syrovetskiy
* ``@dessant``
.. _version-3.1.23:
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:
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:
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 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 startup 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
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.datastructures.LimitedSet` did not 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**: amqp/rpc 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:
- Jeff Widman.
.. _version-3.1.20:
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`` charset 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-gossip` 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`` did not properly call task errbacks on chord
error (Issue #2796).
- **Results**: Restores Redis compatibility with redis-py < 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`` does not 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 does not 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 supervisord example.
Contributed by George Tantiras.
- **Documentation**: Includes improvements by:
- Bryson
- Caleb Mingle
- Christopher Martin
- Dieter Adriaenssens
- Jason Veatch
- Jeremy Cline
- Juan Rossi
- Kevin Harvey
- Kevin McCarthy
- Kirill Pavlov
- Marco Buttu
- Mayflower
- Mher Movsisyan
- Michael Floering
- michael-k
- Nathaniel Varona
- Rudy Attias
- Ryan Luckie
- Steven Parker
- squfrans
- Tadej Janež
- TakesxiSximada
- Tom S
.. _version-3.1.19:
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.
E.g. ``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 did not 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
jerry
Jocelyn Delalande
Josh Kupershmidt
Juan Rossi
kanemra
Paul Pearce
Pavel Savchenko
Sean Wang
Seungha Kim
Zhaorong Ma
.. _version-3.1.18:
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 celerybeat generic init script now uses
``/bin/sh`` instead of 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 ``--executable`` argument that can
be used with ``--detach``.
Contributed by Bert Vanderbauwhede.
- **Canvas**: Fixed crash in chord unlock fallback task (Issue #2404).
- **Worker**: Fixed rare crash occurring with ``--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:
3.1.17
======
:release-date: 2014-11-19 03:30 P.M UTC
:release-by: Ask Solem
.. admonition:: Do not enable the :setting:`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 was not called properly if ``link`` was a list of
signatures (Issuse #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 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 was not 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 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 Py2.6.2 so for
compatibility this format is now excluded when using earlier versions
(Issue #1644).
.. _version-3.1.16:
3.1.16
======
:release-date: 2014-10-03 06:00 P.M UTC
:release-by: Ask Solem
- **Worker**: 3.1.15 broke ``-Ofair`` 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()`` did not 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:
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 finally call leading to
AMQP result backend queues not being properly cleaned up (Issue #2245).
.. _version-3.1.14:
3.1.14
======
:release-date: 2014-09-08 03:00 P.M UTC
:release-by: Ask Solem
- **Requirements**
- Now depends on :ref:`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**: `--umask` argument can be now specified in both octal (if starting
with 0) or decimal.
.. _version-3.1.13:
3.1.13
======
Security Fixes
--------------
* [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`:
http://github.com/celery/celery/tree/master/docs/sec/CELERYSA-0002.txt
News
----
- **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 requeue 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 will not move
1ms after every invocation.
- Documentation fixes
Contributed by Yuval Greenfield, Lucas Wiman, nicholsonjf
- **Worker**: Removed an outdated assert statement that could lead to errors
being masked (Issue #2086).
.. _version-3.1.12:
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 were not 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 did not 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)`` did not 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 did not 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` did not 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 were not 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 did not quote
:envvar:`CELERY_CHDIR`.
Fix contributed by ffeast.
.. _version-3.1.11:
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:`--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:
3.1.10
======
:release-date: 2014-03-22 09:40 P.M UTC
:release-by: Ask Solem
- **Requirements**:
- Now depends on :ref:`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 is 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 will not 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:
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. :option:`-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 ``UnicodeEncodeError`` occuring when worker is started
by `supervisord`.
Fix contributed by Codeb Fan.