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celery


			
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  <ul>
    <li>Background Processing
    <li>Distributed
    <li>Asynchronous/Synchronous
    <li>Concurrency
    <li>Periodic Tasks
    <li>Retries
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        <h2>Distributed Task Queue</h2>
        <p>Celery is an open source asynchronous task queue/job queue based on
        distributed message passing.  It is focused on real-time operation,
        but supports scheduling as well.</p>

        <p>The execution units, called tasks, are executed concurrently on one or
        more worker nodes. Tasks can execute asynchronously (in the background) or synchronously
        (wait until ready).</p>

        <p>Celery is already used in production to process millions of tasks a day.</p>

        <p>Celery is written in Python, but the protocol can be implemented in any
        language.
        It can also <a href="http://celeryq.org/docs/userguide/remote-tasks.html"
        >operate with other languages</a> using webhooks.</p>

        <p>The recommended message broker is <a href="http://rabbitmq.com/">RabbitMQ</a>,
        but support for <a href="http://redisdb.com/">Redis</a> and databases
        is also available.</p>

        Celery is easy to integrate with Django and Pylons, using
        the <a href="http://pypi.python.org/pypi/django-celery">django-celery</a> and
        <a href="http://bitbucket.org/ianschenck/celery-pylons">celery-pylons</a> add-on packages.

        <h3>Example</h3>
        <p>This is a simple task adding two numbers:</p>
<div class="highlight"><pre><span class="kn">from</span> <span class="nn">celery.decorators</span> <span class="kn">import</span> <span class="n">task</span>

<span class="nd">@task</span>
<span class="k">def</span> <span class="nf">add</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">):</span>
    <span class="k">return</span> <span class="n">x</span> <span class="o">+</span> <span class="n">y</span>
</pre></div>

        <p>You can execute the task in the background, or wait for it to
        finish:</p>

<div class="highlight"><pre><span class="o">&gt;&gt;&gt;</span> <span class="n">result</span> <span class="o">=</span> <span class="n">add</span><span class="o">.</span><span class="n">delay</span><span class="p">(</span><span class="mi">8</span><span class="p">,</span> <span class="mi">8</span><span class="p">)</span>
<span class="o">&gt;&gt;&gt;</span> <span class="n">result</span><span class="o">.</span><span class="n">wait</span><span class="p">()</span> <span class="c"># wait for and return the result</span>
<span class="mi">16</span>
</pre></div>

    <h3>Getting Started</h3>

    <ol>
        <li>Install celery by download or <code>pip install -U celery</code></li>
        <li>Set up <a href="http://celeryq.org/docs/getting-started/broker-installation.html">RabbitMQ</a>
        or one of the <a href="http://celeryq.org/docs/tutorials/otherqueues.html">ghetto queue</a>
        solutions.
        <li>Select one of the following guides:
        <ul>
            <li><a
                href="http://celeryq.org/docs/getting-started/first-steps-with-celery.html">First steps with Python</a></li>
            <li><a href="http://celeryq.org/docs/django-celery/getting-started/first-steps-with-django.html">First steps with Django</a></li>
        </ul>
    </ol>

    <h3>Community</h3>

    <p>There is a <a href="http://groups.google.com/group/celery-users">mailing-list</a>
    available for general discussion.</p>

    <p>For those craving real, human interaction, there is also an IRC channel
    (<code>#celery</code> on <code>irc.freenode.net</code>).</p>

    <p>Finally, if you find a bug or would like to request a feature,
    please <a href="http://github.com/ask/celery/issues">submit an
        issue</a>.</p>

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      <span class="newsitem">
      <h2>Celery 2.1 released!</h2>
      <h4>By <a href="http://twitter.com/asksol">@asksol</a> on 2010-10-08.</h4>
      <p>This new version is now available at PyPI.  Be sure to read the
      <a href="http://celeryq.org/docs/changelog.html">Changelog</a> before upgrading.</p>
      </span>

      <span class="newsitem">
      <h2>Celery 2.0 released!</h2>
      <h4>By <a href="http://twitter.com/asksol">@asksol</a> on 2010-07-02.</h4>
      <p>We're proud to announce the release of Celery 2.0. This version replaces
      the Django ORM with SQLAlchemy as the database result store. With this, Celery no
      longer depends on Django. Django integration is now available as a separate package
      called <a href="http://pypi.python.org/pypi/django-celery">django-celery</a>.
      </p>

      <p>In addition there are a lot of new features: a curses monitor, time
      limits, complex crontab expressions, callbacks, simplified routing,
      and more. Everything is detailed in the <a
          href="http://celeryq.org/docs/changelog.html#id1">changelog</a>,
      so be sure to read it before upgrading.</p>
      </span>

      <span class="newsitem">
      <h2>Celery 1.0.6 released!</h2>
      <h4>By <a href="http://twitter.com/asksol">@asksol</a> on 2010-06-30.</h4>
      <p>RabbitMQ 1.8.0 came with stricter equivalence checks that broke the
      AMQP result backend, this release resolves this. If you've already used
      the AMQP backend you need to delete the previous declarations. For
      instructions please read the full
      <a href="http://celeryproject.org/docs/changelog.html">changelog</a>.
      Download from <a href="http://pypi.python.org/pypi/celery/1.0.6">PyPI</a>,
      or simply install the upgrade using <code>pip install -U celery==1.0.6</code>.
      <hr>
      </span>

      <span class="newsitem">
      <h2>Celery 1.0.5 released!</h2>
      <h4>By <a href="http://twitter.com/asksol">@asksol</a> on 2010-06-01.</h4>
      <p>This release contains some important bugfixes related to shutdown and
      broker connection loss, as well as some other minor fixes. Also
      AbortableTask has been added to contrib. Please read the full <a href="http://celeryproject.org/docs/changelog.html">changelog</a>
      before you upgrade. Download from <a href="http://pypi.python.org/pypi/celery/1.0.5">PyPI</a>,
      or simply install the upgrade using <code>pip install -U celery</code>.
      <hr>
      </span>

      <span class="newsitem">
      <h2>Celery 1.0.3 released!</h2>
      <h4>By <a href="http://twitter.com/asksol">@asksol</a> on 2010-05-15.</h4>
      <p>This release contains a drastic improvement in reliability and
      performance. Please read the full <a href="http://celeryproject.org/docs/changelog.html">changelog</a>
      before you upgrade. Download from <a href="http://pypi.python.org/pypi/celery/1.0.3">PyPI</a>,
      or simply install the upgrade using <code>pip install -U celery</code>.
      <hr>
      </span>

      <span class="newsitem">
      <h2>Celery 1.0.1 released!</h2>
      <h4>By <a href="http://twitter.com/asksol">@asksol</a> on 2010-03-20.</h4>
      <p>This is a bugfix release and has some important changes to the
      shutdown procedure. Also improved compatibility with Windows and Python
      2.4. Read the full <a href="http://celeryproject.org/docs/changelog.html">Changelog</a>
      for more information. Download from <a
          href="http://pypi.python.org/pypi/celery/1.0.1">PyPI</a>,
      or simply install the upgrade using <code>pip install -U celery</code>.
      <hr>
      </span>

      <span class="newsitem">
      <h2>Celery 1.0 released!</h2>
      <h4>By <a href="http://twitter.com/asksol">@asksol</a> on 2010-02-10</h4>
      <p>Celery 1.0 has finally been released! It is available on <a
          href="http://pypi.python.org/pypi/celery/1.0.0">PyPI</a> for
      downloading. You can also install it via <code>pip install
          celery</code>. You can read the announcement <a href="http://celeryproject.org/celery_1.0_released.html">here</a>.
      <hr>
      </span>

      <span class="newsitem">
      <h2>1.0 is in beta.</h2>
      <h4>By <a href="http://twitter.com/asksol">@asksol</a> on 2010-02-08</h4>
      <p>1.0 is scheduled to be released this week! Please help us test the latest
      <a href="http://github.com/ask/celery/tarball/v1.0.0-pre4">release
          candiate</a> to make this happen. To upgrade from an earlier
      version, please read the <a href="http://celeryq.org/docs/changelog.html">changelog</a>.
      <hr>
      </span>

      <span class="newsitem">
      <h2>New website.</h2>
      <h4>By <a href="http://twitter.com/asksol">@asksol</a> on 2010-02-08</h4>
      <p>We finally got a home page. Big thanks to <a href="http://helmersworks.com/">Jan Henrik Helmers</a>
      <hr>
      </span>

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 <div id="credits">
   <ul>
     <li>
       <strong>Copyright (c) 2009-2010</strong>
       <span><a href="http://twitter.com/asksol">Ask Solem</a> and
         <a href="http://github.com/ask/celery/blob/master/AUTHORS">contributors</a>.</span>
     </li>
     <li>
       <strong>Web Design</strong>
       <span><a href="http://www.helmersworks.com/">Jan Henrik Helmers</a></span>
     </li>
   </ul>
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