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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-3.1.17:
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 disable this option if you're using the RabbitMQ or Redis
transport.
Keeping this option enabled after 3.1 means the async based worker will
be disabled, which is more likely to lead to trouble than doing good.
- **Requirements**
- Now depends on :ref:`Kombu 3.0.24 <kombu:version-3.0.24>`.
Includes new Qpid transport backported from the future 3.2 version
for 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:`~@Celery.config_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.
- **Beat**: No longer attempts to upgrade a newly created database file
(Issue #1923).
- **Beat**: New setting :setting:``CELERYBEAT_SYNC_EVERY`` can be 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 is not 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:
3.1.9
=====
:release-date: 2014-02-10 06:43 P.M UTC
:release-by: Ask Solem
- **Requirements**:
- Now depends on :ref:`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 was not
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` did not 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:
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 was not 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 ``Ctrl+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 startup to verify
that any configuration scripts are owned by root and that they
are not world/group writeable.
The init script configuration is a shell script executed by root,
so this is a preventive measure to ensure that users do not
leave this file vulnerable to changes by unprivileged users.
.. note::
Note that upgrading celery will not 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` was added that can be used to disable
interactive mode.
- **Task**: ``.retry()`` did not raise the value provided in the ``exc`` argument
when called outside of an error context (*Issue #1755*).
- **Commands:** The :program:`celery multi` command did not 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 startup 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 OS X 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` 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:** Supervisord examples contained an extraneous '-' in a
`--logfile` argument example.
Fix contributed by Mohammad Almeer.
.. _version-3.1.7:
3.1.7
=====
:release-date: 2013-12-17 06:00 P.M UTC
:release-by: Ask Solem
.. _v317-important:
Important Notes
---------------
Init script security improvements
---------------------------------
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 is not trusted
with superuser privileges.
This is not 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 is 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 are doing you can avoid the warning (and
the future exception being raised) by moving the operation in a whitelist
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 <prefork-pool-prefetch>`.
.. _v317-fixes:
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 will not 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 ``-B`` argument did not properly shut down the beat instance.
- Worker: The ``%n`` and ``%h`` formats are now also supported by the
:option:`--logfile`, :option:`--pidfile` and :option:`--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 fallbock 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 is set when a ``task-sent`` event is being received.
Also, a clients logical clock is not 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 did not 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:
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 startup
(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``)