celery/Changelog

==============
Change history
==============

0.3.0 [2009-06-08 12:41 P.M CET] askh@opera.com
-----------------------------------------------
**NOTE** This is a development version, for the stable release, please
see versions 0.2.x.

**VERY IMPORTANT:** Pickle is now the encoder used for serializing task
arguments, so be sure to flush your task queue before you upgrade.

	* **IMPORTANT** TaskSet.run() now returns a celery.result.TaskSetResult
		instance, which lets you inspect the status and return values of a
		taskset as it was a single entity.

	* **IMPORTANT** Celery now depends on carrot >= 0.4.1.

	* The celery daemon now sends task errors to the registered admin e-mails.
		To turn off this feature, set ``SEND_CELERY_TASK_ERROR_EMAILS`` to
		``False`` in your ``settings.py``. Thanks to Grégoire Cachet.

	* You can now run the celery daemon by using ``manage.py``::
		
			$ python manage.py celeryd

		Thanks to Grégoire Cachet.

	* Added support for message priorities, topic exchanges, custom routing
		keys for tasks. This means we have introduced
		``celery.task.apply_async``, a new way of executing tasks.

		You can use ``celery.task.delay`` and ``celery.Task.delay`` like usual, but
		if you want greater control over the message sent, you want
		``celery.task.apply_async`` and ``celery.Task.apply_async``.

		This also means the AMQP configuration has changed. Some settings has
		been renamed, while others are new::

			CELERY_AMQP_EXCHANGE
			CELERY_AMQP_PUBLISHER_ROUTING_KEY
			CELERY_AMQP_CONSUMER_ROUTING_KEY
			CELERY_AMQP_CONSUMER_QUEUE
			CELERY_AMQP_EXCHANGE_TYPE

		See the entry `Can I send some tasks to only some servers?`_ in the
		`FAQ`_ for more information.

.. _`Can I send some tasks to only some servers?`:
		http://bit.ly/celery_AMQP_routing
.. _`FAQ`: http://ask.github.com/celery/faq.html

	* Task errors are now logged using loglevel ``ERROR`` instead of ``INFO``,
		and backtraces are dumped. Thanks to Grégoire Cachet.

	* Make every new worker process re-establish it's Django DB connection,
		this solving the "MySQL connection died?" exceptions.
		Thanks to Vitaly Babiy and Jirka Vejrazka.

	* **IMOPORTANT** Now using pickle to encode task arguments. This means you
		now can pass complex python objects to tasks as arguments.

	* Removed dependency on ``yadayada``.

	* Added a FAQ, see ``docs/faq.rst``.

	* Now converts any unicode keys in task ``kwargs`` to regular strings.
		Thanks Vitaly Babiy.

	* Renamed the ``TaskDaemon`` to ``WorkController``.

	* ``celery.datastructures.TaskProcessQueue`` is now renamed to
		``celery.pool.TaskPool``.

	* The pool algorithm has been refactored for greater performance and
		stability.

0.2.0 [2009-05-20 05:14 P.M CET] askh@opera.com
------------------------------------------------

	* Final release of 0.2.0

	* Compatible with carrot version 0.4.0.

	* Fixes some syntax errors related to fetching results
	  from the database backend.

0.2.0-pre3 [2009-05-20 05:14 P.M CET] askh@opera.com
----------------------------------------------------

	 * *Internal release*. Improved handling of unpickled exceptions,
	 	get_result() now tries to recreate something looking like the
	 	original exception.

0.2.0-pre2 [2009-05-20 01:56 P.M CET] askh@opera.com
----------------------------------------------------

	* Now handles unpickleable exceptions (like the dynimically generated
	  subclasses of ``django.core.exception.MultipleObjectsReturned``).

0.2.0-pre1 [2009-05-20 12:33 P.M CET] askh@opera.com
----------------------------------------------------

	* It's getting quite stable, with a lot of new features, so bump
	  version to 0.2. This is a pre-release.

	* ``celery.task.mark_as_read()`` and ``celery.task.mark_as_failure()`` has
	  been removed. Use ``celery.backends.default_backend.mark_as_read()``, 
	  and ``celery.backends.default_backend.mark_as_failure()`` instead.

0.1.15 [2009-05-19 04:13 P.M CET] askh@opera.com
------------------------------------------------

	* The celery daemon was leaking AMQP connections, this should be fixed,
	  if you have any problems with too many files open (like ``emfile``
	  errors in ``rabbit.log``, please contact us!

0.1.14 [2009-05-19 01:08 P.M CET] askh@opera.com
------------------------------------------------

	* Fixed a syntax error in the ``TaskSet`` class.  (No such variable
	  ``TimeOutError``).

0.1.13 [2009-05-19 12:36 P.M CET] askh@opera.com
------------------------------------------------

	* Forgot to add ``yadayada`` to install requirements.

	* Now deletes all expired task results, not just those marked as done.

	* Able to load the Tokyo Tyrant backend class without django
	  configuration, can specify tyrant settings directly in the class
	  constructor.

	* Improved API documentation

	* Now using the Sphinx documentation system, you can build
	  the html documentation by doing ::

			$ cd docs
			$ make html
	
	  and the result will be in ``docs/.build/html``.

0.1.12 [2009-05-18 04:38 P.M CET] askh@opera.com
------------------------------------------------

    * ``delay_task()`` etc. now returns ``celery.task.AsyncResult`` object,
      which lets you check the result and any failure that might have
      happened.  It kind of works like the ``multiprocessing.AsyncResult``
      class returned by ``multiprocessing.Pool.map_async``.

    * Added dmap() and dmap_async(). This works like the 
      ``multiprocessing.Pool`` versions except they are tasks
      distributed to the celery server. Example:

        >>> from celery.task import dmap
        >>> import operator
        >>> dmap(operator.add, [[2, 2], [4, 4], [8, 8]])
        >>> [4, 8, 16]
        
        >>> from celery.task import dmap_async
        >>> import operator
        >>> result = dmap_async(operator.add, [[2, 2], [4, 4], [8, 8]])
        >>> result.ready()
        False
        >>> time.sleep(1)
        >>> result.ready()
        True
        >>> result.result
        [4, 8, 16]

    * Refactored the task metadata cache and database backends, and added a new backend for Tokyo Tyrant. You can set the backend in your django settings file. e.g

        CELERY_BACKEND = "database"; # Uses the database

        CELERY_BACKEND = "cache"; # Uses the django cache framework

        CELERY_BACKEND = "tyrant"; # Uses Tokyo Tyrant
        TT_HOST = "localhost"; # Hostname for the Tokyo Tyrant server.
        TT_PORT = 6657; # Port of the Tokyo Tyrant server.

0.1.11 [2009-05-12 02:08 P.M CET] askh@opera.com
-------------------------------------------------

	* The logging system was leaking file descriptors, resulting in
	  servers stopping with the EMFILES (too many open files) error. (fixed)

0.1.10 [2009-05-11 12:46 P.M CET] askh@opera.com
-------------------------------------------------

	* Tasks now supports both positional arguments and keyword arguments.

	* Requires carrot 0.3.8.

	* The daemon now tries to reconnect if the connection is lost.

0.1.8 [2009-05-07 12:27 P.M CET] askh@opera.com
------------------------------------------------

	* Better test coverage
	* More documentation
	* celeryd doesn't emit ``Queue is empty`` message if
	  ``settings.CELERYD_EMPTY_MSG_EMIT_EVERY`` is 0.

0.1.7 [2009-04-30 1:50 P.M CET] askh@opera.com
-----------------------------------------------

	* Added some unittests

	* Can now use the database for task metadata (like if the task has
	  been executed or not). Set ``settings.CELERY_TASK_META``

	* Can now run ``python setup.py test`` to run the unittests from
	  within the ``testproj`` project.

	* Can set the AMQP exchange/routing key/queue using
	  ``settings.CELERY_AMQP_EXCHANGE``, ``settings.CELERY_AMQP_ROUTING_KEY``,
	  and ``settings.CELERY_AMQP_CONSUMER_QUEUE``.

0.1.6 [2009-04-28 2:13 P.M CET] askh@opera.com
-----------------------------------------------

	* Introducing ``TaskSet``. A set of subtasks is executed and you can
	  find out how many, or if all them, are done (excellent for progress bars and such)

	* Now catches all exceptions when running ``Task.__call__``, so the
	  daemon doesn't die. This does't happen for pure functions yet, only
	  ``Task`` classes.

	* ``autodiscover()`` now works with zipped eggs.

	* celeryd: Now adds curernt working directory to ``sys.path`` for
	  convenience.

	* The ``run_every`` attribute of ``PeriodicTask`` classes can now be a
	  ``datetime.timedelta()`` object.

	* celeryd: You can now set the ``DJANGO_PROJECT_DIR`` variable
	  for ``celeryd`` and it will add that to ``sys.path`` for easy launching.

	* Can now check if a task has been executed or not via HTTP.

	You can do this by including the celery ``urls.py`` into your project,

		>>> url(r'^celery/$', include("celery.urls"))

	then visiting the following url,::

		http://mysite/celery/$task_id/done/

	this will return a JSON dictionary like e.g:

		>>> {"task": {"id": $task_id, "executed": true}}

	* ``delay_task`` now returns string id, not ``uuid.UUID`` instance.

	* Now has ``PeriodicTasks``, to have ``cron`` like functionality.

	* Project changed name from ``crunchy`` to ``celery``. The details of
	  the name change request is in ``docs/name_change_request.txt``.

0.1.0 [2009-04-24 11:28 A.M CET] askh@opera.com
------------------------------------------------

	* Initial release