Celery

=====
:release-date: 2012-08-24 04:00 P.M BST
:release-by: Ask Solem

- Redis: Fixed race condition that could cause the consumer to crash (Issue 151)

Often leading to the error message ``"could not convert string to float"``

- Connection retry could cause an inifite loop (Issue 145).

- The ``amqp`` alias is now resolved at runtime, so that eventlet detection
works even if patching was done later.

.. _version-2.4.0:

=====
:release-date: 2012-08-17 08:00 P.M BST
:release-by: Ask Solem

- New experimental :mod:`ZeroMQ <kombu.transport.zmq` transport.

Contributed by John Watson.

- Redis: Ack timed-out messages were not restored when using the eventloop.

- Now uses pickle protocol 2 by default to be cross-compatible with Python 3.

The protocol can also now be changed using the :envvar:`PICKLE_PROTOCOL`
environment variable.

- Adds ``Transport.supports_ev`` attribute.

- Pika: Queue purge was not working properly.

Fix contributed by Steeve Morin.

- Pika backend was no longer working since Kombu 2.3

Fix contributed by Steeve Morin.

.. _version-2.3.2:

=====
:release-date: 2012-08-01 06:00 P.M BST
:release-by: Ask Solem

- Fixes problem with deserialization in Python 3.

.. _version-2.3.1:

=====
:release-date: 2012-08-01 04:00 P.M BST
:release-by: Ask Solem

- librabbitmq: Can now handle messages that does not have a
content_encoding/content_type set (Issue 149).

Fix contributed by C Anthony Risinger.

- Beanstalk: Now uses localhost by default if the URL does not contain a host.

.. _version-2.3.0:

=====
:release-date: 2012-07-24 03:50 P.M BST
:release-by: Ask Solem

- New ``pyamqp://`` transport!

The new `py-amqp`_ library is a fork of amqplib started with the
following goals:

- Uses AMQP 0.9.1 instead of 0.8
- Should support all RabbitMQ extensions
- API compatible with :mod:`librabbitmq` so that it can be used
as a pure-python replacement in environments where rabbitmq-c cannot
be compiled.

.. _`py-amqp`: https://amqp.readthedocs.io/

If you start using use py-amqp instead of amqplib you can enjoy many
advantages including:

- Heartbeat support (Issue 79 + Issue 131)
- Consumer Cancel Notifications (Issue 131)
- Publisher Confirms

amqplib has not been updated in a long while, so maintaining our own fork
ensures that we can quickly roll out new features and fixes without
resorting to monkey patching.

To use the py-amqp transport you must install the :mod:`amqp` library:

.. code-block:: console

$ pip install amqp

and change the connection URL to use the correct transport:

.. code-block:: pycon

>>> conn = Connection('pyamqp://guest:guestlocalhost//')


The ``pyamqp://`` transport will be the default fallback transport
in Kombu version 3.0, when :mod:`librabbitmq` is not installed,
and librabbitmq will also be updated to support the same features.

- Connection now supports heartbeat argument.

If enabled you must make sure to manually maintain heartbeats
by calling the ``Connection.heartbeat_check`` at twice the rate
of the specified heartbeat interval.

E.g. if you have ``Connection(heartbeat=10)``,
then you must call ``Connection.heartbeat_check()`` every 5 seconds.

if the server has not sent heartbeats at a suitable rate then
the heartbeat check method must raise an error that is listed
in ``Connection.connection_errors``.

The attribute ``Connection.supports_heartbeats`` has been added
for the ability to inspect if a transport supports heartbeats
or not.

Calling ``heartbeat_check`` on a transport that does
not support heartbeats results in a noop operation.

- SQS: Fixed bug with invalid characters in queue names.

Fix contributed by Zach Smith.

- utils.reprcall: Fixed typo where kwargs argument was an empty tuple by
default, and not an empty dict.

.. _version-2.2.6:

=====
:release-date: 2012-07-10 05:00 P.M BST
:release-by: Ask Solem

- Adds ``kombu.messaging.entry_to_queue`` for compat with previous versions.

.. _version-2.2.5: