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+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
 
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+<html xmlns="http://www.w3.org/1999/xhtml">
 
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+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 
+    
+    <title>Frequently Asked Questions &mdash; Celery v0.2.14 documentation</title>
 
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+	<h1><a href="index.html">Celery v0.2.14 documentation</a></h1>
 
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+          <a href="genindex.html" title="General Index"
 
+             accesskey="I">index</a> |
 
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+             accesskey="M">modules</a> |
 
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+          <a href="introduction.html" title="celery - Distributed Task Queue for Django."
 
+             accesskey="P">previous</a>
 
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+	<div class="document">
 
+	  <div class="documentwrapper">
 
+	    <div class="bodywrapper">
 
+	      <div class="body">
 
+		
+  <div class="section" id="frequently-asked-questions">
 
+<h1>Frequently Asked Questions<a class="headerlink" href="#frequently-asked-questions" title="Permalink to this headline">¶</a></h1>
 
+<div class="section" id="questions">
 
+<h2>Questions<a class="headerlink" href="#questions" title="Permalink to this headline">¶</a></h2>
 
+<div class="section" id="mysql-is-throwing-deadlock-errors-what-can-i-do">
 
+<h3>MySQL is throwing deadlock errors, what can I do?<a class="headerlink" href="#mysql-is-throwing-deadlock-errors-what-can-i-do" title="Permalink to this headline">¶</a></h3>
 
+<p><strong>Answer:</strong> MySQL has default isolation level set to <tt class="docutils literal"><span class="pre">REPEATABLE-READ</span></tt>,
 
+if you don&#8217;t really need that, set it to <tt class="docutils literal"><span class="pre">READ-COMMITTED</span></tt>.
 
+You can do that by adding the following to your <tt class="docutils literal"><span class="pre">my.cnf</span></tt>:</p>
 
+<div class="highlight-python"><div class="highlight"><pre><span class="p">[</span><span class="n">mysqld</span><span class="p">]</span>
 
+<span class="n">transaction</span><span class="o">-</span><span class="n">isolation</span> <span class="o">=</span> <span class="n">READ</span><span class="o">-</span><span class="n">COMMITTED</span>
 
+</pre></div>
 
+</div>
 
+<p>For more information about InnoDBs transaction model see <a class="reference external" href="http://dev.mysql.com/doc/refman/5.1/en/innodb-transaction-model.html">MySQL - The InnoDB
 
+Transaction Model and Locking</a> in the MySQL user manual.</p>
 
+<p>(Thanks to Honza Kral and Anton Tsigularov for this solution)</p>
 
+</div>
 
+<div class="section" id="celeryd-is-not-doing-anything-just-hanging">
 
+<h3>celeryd is not doing anything, just hanging<a class="headerlink" href="#celeryd-is-not-doing-anything-just-hanging" title="Permalink to this headline">¶</a></h3>
 
+<p><strong>Answer:</strong> See <a class="reference internal" href="#mysql-is-throwing-deadlock-errors-what-can-i-do">MySQL is throwing deadlock errors, what can I do?</a>.</p>
 
+</div>
 
+<div class="section" id="can-i-send-some-tasks-to-only-some-servers">
 
+<h3>Can I send some tasks to only some servers?<a class="headerlink" href="#can-i-send-some-tasks-to-only-some-servers" title="Permalink to this headline">¶</a></h3>
 
+<p>As of now there is only one use-case that works like this, and that is
 
+tasks of type <tt class="docutils literal"><span class="pre">A</span></tt> can be sent to servers <tt class="docutils literal"><span class="pre">x</span></tt> and <tt class="docutils literal"><span class="pre">y</span></tt>, while tasks
 
+of type <tt class="docutils literal"><span class="pre">B</span></tt> can be sent to server <tt class="docutils literal"><span class="pre">z</span></tt>. One server can&#8217;t handle more than
 
+one routing_key, but this is coming in a later release.</p>
 
+<p>Say you have two servers, <tt class="docutils literal"><span class="pre">x</span></tt>, and <tt class="docutils literal"><span class="pre">y</span></tt> that handles regular tasks,
 
+and one server <tt class="docutils literal"><span class="pre">z</span></tt>, that only handles feed related tasks, you can use this
 
+configuration:</p>
 
+<blockquote>
 
+<ul class="simple">
 
+<li>Servers <tt class="docutils literal"><span class="pre">x</span></tt> and <tt class="docutils literal"><span class="pre">y</span></tt>: settings.py:</li>
 
+</ul>
 
+<div class="highlight-python"><div class="highlight"><pre><span class="n">AMQP_SERVER</span> <span class="o">=</span> <span class="s">&quot;rabbit&quot;</span>
 
+<span class="n">AMQP_PORT</span> <span class="o">=</span> <span class="mf">5678</span>
 
+<span class="n">AMQP_USER</span> <span class="o">=</span> <span class="s">&quot;myapp&quot;</span>
 
+<span class="n">AMQP_PASSWORD</span> <span class="o">=</span> <span class="s">&quot;secret&quot;</span>
 
+<span class="n">AMQP_VHOST</span> <span class="o">=</span> <span class="s">&quot;myapp&quot;</span>
 
+
 
+<span class="n">CELERY_AMQP_CONSUMER_QUEUE</span> <span class="o">=</span> <span class="s">&quot;regular_tasks&quot;</span>
 
+<span class="n">CELERY_AMQP_EXCHANGE</span> <span class="o">=</span> <span class="s">&quot;tasks&quot;</span>
 
+<span class="n">CELERY_AMQP_PUBLISHER_ROUTING_KEY</span> <span class="o">=</span> <span class="s">&quot;task.regular&quot;</span>
 
+<span class="n">CELERY_AMQP_CONSUMER_ROUTING_KEY</span> <span class="o">=</span> <span class="s">&quot;task.#&quot;</span>
 
+<span class="n">CELERY_AMQP_EXCHANGE_TYPE</span> <span class="o">=</span> <span class="s">&quot;topic&quot;</span>
 
+</pre></div>
 
+</div>
 
+<ul class="simple">
 
+<li>Server <tt class="docutils literal"><span class="pre">z</span></tt>: settings.py:</li>
 
+</ul>
 
+<div class="highlight-python"><div class="highlight"><pre><span class="n">AMQP_SERVER</span> <span class="o">=</span> <span class="s">&quot;rabbit&quot;</span>
 
+<span class="n">AMQP_PORT</span> <span class="o">=</span> <span class="mf">5678</span>
 
+<span class="n">AMQP_USER</span> <span class="o">=</span> <span class="s">&quot;myapp&quot;</span>
 
+<span class="n">AMQP_PASSWORD</span> <span class="o">=</span> <span class="s">&quot;secret&quot;</span>
 
+<span class="n">AMQP_VHOST</span> <span class="o">=</span> <span class="s">&quot;myapp&quot;</span>
 
+
 
+<span class="n">CELERY_AMQP_CONSUMER_QUEUE</span> <span class="o">=</span> <span class="s">&quot;feed_tasks&quot;</span>
 
+<span class="n">CELERY_AMQP_EXCHANGE</span> <span class="o">=</span> <span class="s">&quot;tasks&quot;</span>
 
+<span class="n">CELERY_AMQP_PUBLISHER_ROUTING_KEY</span> <span class="o">=</span> <span class="s">&quot;task.regular&quot;</span>
 
+<span class="n">CELERY_AMQP_CONSUMER_ROUTING_KEY</span> <span class="o">=</span> <span class="s">&quot;task.feed.#&quot;</span>
 
+<span class="n">CELERY_AMQP_EXCHANGE_TYPE</span> <span class="o">=</span> <span class="s">&quot;topic&quot;</span>
 
+</pre></div>
 
+</div>
 
+</blockquote>
 
+<p>Now to make a Task run on the <tt class="docutils literal"><span class="pre">z</span></tt> server you need to set its
 
+<tt class="docutils literal"><span class="pre">routing_key</span></tt> attribute so it starts with the words <tt class="docutils literal"><span class="pre">&quot;task.feed.&quot;</span></tt>:</p>
 
+<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">feedaggregator.models</span> <span class="kn">import</span> <span class="n">Feed</span>
 
+<span class="kn">from</span> <span class="nn">celery.task</span> <span class="kn">import</span> <span class="n">Task</span>
 
+
 
+<span class="k">class</span> <span class="nc">FeedImportTask</span><span class="p">(</span><span class="n">Task</span><span class="p">):</span>
 
+    <span class="n">name</span> <span class="o">=</span> <span class="s">&quot;import_feed&quot;</span>
 
+    <span class="n">routing_key</span> <span class="o">=</span> <span class="s">&quot;task.feed.importer&quot;</span>
 
+
 
+    <span class="k">def</span> <span class="nf">run</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">feed_url</span><span class="p">):</span>
 
+        <span class="c"># something importing the feed</span>
 
+        <span class="n">Feed</span><span class="o">.</span><span class="n">objects</span><span class="o">.</span><span class="n">import_feed</span><span class="p">(</span><span class="n">feed_url</span><span class="p">)</span>
 
+</pre></div>
 
+</div>
 
+<p>You can also override this using the <tt class="docutils literal"><span class="pre">routing_key</span></tt> argument to
 
+<a title="celery.task.apply_async" class="reference external" href="reference/celery.task.html#celery.task.apply_async"><tt class="xref docutils literal"><span class="pre">celery.task.apply_async()</span></tt></a>:</p>
 
+<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">celery.task</span> <span class="kn">import</span> <span class="n">apply_async</span>
 
+<span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">myapp.tasks</span> <span class="kn">import</span> <span class="n">RefreshFeedTask</span>
 
+<span class="gp">&gt;&gt;&gt; </span><span class="n">apply_async</span><span class="p">(</span><span class="n">RefreshFeedTask</span><span class="p">,</span> <span class="n">args</span><span class="o">=</span><span class="p">[</span><span class="s">&quot;http://cnn.com/rss&quot;</span><span class="p">],</span>
 
+<span class="gp">... </span>            <span class="n">routing_key</span><span class="o">=</span><span class="s">&quot;task.feed.importer&quot;</span><span class="p">)</span>
 
+</pre></div>
 
+</div>
 
+</div>
 
+</div>
 
+</div>
 
+
 
+
 
+	      </div>
 
+	    </div>
 
+	  </div>
 
+	</div>
 
+	<div class="sidebar">
 
+	  <h3>Contents</h3>
 
+	  <ul class="current">
 
+<li class="toctree-l1"><a class="reference external" href="introduction.html">celery - Distributed Task Queue for Django.</a></li>
 
+<li class="toctree-l1 current"><a class="current reference external" href="">Frequently Asked Questions</a><ul>
 
+<li class="toctree-l2"><a class="reference external" href="#questions">Questions</a></li>
 
+</ul>
 
+</li>
 
+<li class="toctree-l1"><a class="reference external" href="reference/index.html">Module API Reference</a></li>
 
+</ul>
 
+
 
+	  <h3 style="margin-top: 1.5em;">Search</h3>
 
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+            <input type="text" name="q" size="18" />
 
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+            Enter search terms or a module, class or function name.
 
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+ 98 - 0
sources/faq.txt
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+============================
 
+ Frequently Asked Questions
 
+============================
 
+
 
+Questions
 
+=========
 
+
 
+MySQL is throwing deadlock errors, what can I do?
 
+-------------------------------------------------
 
+
 
+**Answer:** MySQL has default isolation level set to ``REPEATABLE-READ``,
 
+if you don't really need that, set it to ``READ-COMMITTED``.
 
+You can do that by adding the following to your ``my.cnf``::
 
+
 
+    [mysqld]
 
+    transaction-isolation = READ-COMMITTED
 
+
 
+For more information about InnoDBs transaction model see `MySQL - The InnoDB
 
+Transaction Model and Locking`_ in the MySQL user manual.
 
+
 
+(Thanks to Honza Kral and Anton Tsigularov for this solution)
 
+
 
+.. _`MySQL - The InnoDB Transaction Model and Locking`: http://dev.mysql.com/doc/refman/5.1/en/innodb-transaction-model.html
 
+
 
+celeryd is not doing anything, just hanging
 
+--------------------------------------------
 
+
 
+**Answer:** See `MySQL is throwing deadlock errors, what can I do?`_.
 
+
 
+
 
+Can I send some tasks to only some servers?
 
+--------------------------------------------
 
+
 
+As of now there is only one use-case that works like this, and that is
 
+tasks of type ``A`` can be sent to servers ``x`` and ``y``, while tasks
 
+of type ``B`` can be sent to server ``z``. One server can't handle more than
 
+one routing_key, but this is coming in a later release.
 
+
 
+Say you have two servers, ``x``, and ``y`` that handles regular tasks,
 
+and one server ``z``, that only handles feed related tasks, you can use this
 
+configuration:
 
+
 
+    * Servers ``x`` and ``y``: settings.py:
 
+
 
+    .. code-block:: python
 
+
 
+        AMQP_SERVER = "rabbit"
 
+        AMQP_PORT = 5678
 
+        AMQP_USER = "myapp"
 
+        AMQP_PASSWORD = "secret"
 
+        AMQP_VHOST = "myapp"
 
+
 
+        CELERY_AMQP_CONSUMER_QUEUE = "regular_tasks"
 
+        CELERY_AMQP_EXCHANGE = "tasks"
 
+        CELERY_AMQP_PUBLISHER_ROUTING_KEY = "task.regular"
 
+        CELERY_AMQP_CONSUMER_ROUTING_KEY = "task.#"
 
+        CELERY_AMQP_EXCHANGE_TYPE = "topic"
 
+
 
+    * Server ``z``: settings.py:
 
+
 
+    .. code-block:: python
 
+
 
+        AMQP_SERVER = "rabbit"
 
+        AMQP_PORT = 5678
 
+        AMQP_USER = "myapp"
 
+        AMQP_PASSWORD = "secret"
 
+        AMQP_VHOST = "myapp"
 
+        
+        CELERY_AMQP_CONSUMER_QUEUE = "feed_tasks"
 
+        CELERY_AMQP_EXCHANGE = "tasks"
 
+        CELERY_AMQP_PUBLISHER_ROUTING_KEY = "task.regular"
 
+        CELERY_AMQP_CONSUMER_ROUTING_KEY = "task.feed.#"
 
+        CELERY_AMQP_EXCHANGE_TYPE = "topic"
 
+
 
+Now to make a Task run on the ``z`` server you need to set its
 
+``routing_key`` attribute so it starts with the words ``"task.feed."``:
 
+
 
+.. code-block:: python
 
+
 
+    from feedaggregator.models import Feed
 
+    from celery.task import Task
 
+
 
+    class FeedImportTask(Task):
 
+        name = "import_feed"
 
+        routing_key = "task.feed.importer"
 
+
 
+        def run(self, feed_url):
 
+            # something importing the feed
 
+            Feed.objects.import_feed(feed_url)
 
+
 
+
 
+You can also override this using the ``routing_key`` argument to
 
+:func:`celery.task.apply_async`:
 
+
 
+    >>> from celery.task import apply_async
 
+    >>> from myapp.tasks import RefreshFeedTask
 
+    >>> apply_async(RefreshFeedTask, args=["http://cnn.com/rss"],
 
+    ...             routing_key="task.feed.importer")