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<blockquote>
<div></div></blockquote>
<div class="section" id="tasks">
<h1>Tasks<a class="headerlink" href="#tasks" title="Permalink to this headline"></a></h1>
<p>A Task is the basic unit of execution in Airflow. Tasks are arranged into <a class="reference internal" href="dags.html"><span class="doc">DAGs</span></a>, and then have upstream and downstream dependencies set between them into order to express the order they should run in.</p>
<p>There are three basic kinds of Task:</p>
<ul class="simple">
<li><p><a class="reference internal" href="operators.html"><span class="doc">Operators</span></a>, predefined task templates that you can string together quickly to build most parts of your DAGs.</p></li>
<li><p><a class="reference internal" href="sensors.html"><span class="doc">Sensors</span></a>, a special subclass of Operators which are entirely about waiting for an external event to happen.</p></li>
<li><p>A <a class="reference internal" href="taskflow.html"><span class="doc">TaskFlow</span></a>-decorated <code class="docutils literal notranslate"><span class="pre">&#64;task</span></code>, which is a custom Python function packaged up as a Task.</p></li>
</ul>
<p>Internally, these are all actually subclasses of Airflow’s <code class="docutils literal notranslate"><span class="pre">BaseOperator</span></code>, and the concepts of Task and Operator are somewhat interchangeable, but it’s useful to think of them as separate concepts - essentially, Operators and Sensors are <em>templates</em>, and when you call one in a DAG file, you’re making a Task.</p>
<div class="section" id="relationships">
<h2>Relationships<a class="headerlink" href="#relationships" title="Permalink to this headline"></a></h2>
<p>The key part of using Tasks is defining how they relate to each other - their <em>dependencies</em>, or as we say in Airflow, their <em>upstream</em> and <em>downstream</em> tasks. You declare your Tasks first, and then you declare their dependencies second.</p>
<p>There are two ways of declaring dependencies - using the <code class="docutils literal notranslate"><span class="pre">&gt;&gt;</span></code> and <code class="docutils literal notranslate"><span class="pre">&lt;&lt;</span></code> (bitshift) operators:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">first_task</span> <span class="o">&gt;&gt;</span> <span class="n">second_task</span> <span class="o">&gt;&gt;</span> <span class="p">[</span><span class="n">third_task</span><span class="p">,</span> <span class="n">fourth_task</span><span class="p">]</span>
</pre></div>
</div>
<p>Or the more explicit <code class="docutils literal notranslate"><span class="pre">set_upstream</span></code> and <code class="docutils literal notranslate"><span class="pre">set_downstream</span></code> methods:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">first_task</span><span class="o">.</span><span class="n">set_downstream</span><span class="p">(</span><span class="n">second_task</span><span class="p">)</span>
<span class="n">third_task</span><span class="o">.</span><span class="n">set_upstream</span><span class="p">(</span><span class="n">second_task</span><span class="p">)</span>
</pre></div>
</div>
<p>These both do exactly the same thing, but in general we recommend you use the bitshift operators, as they are easier to read in most cases.</p>
<p>By default, a Task will run when all of its upstream (parent) tasks have succeeded, but there are many ways of modifying this behaviour to add branching, only wait for some upstream tasks, or change behaviour based on where the current run is in history. For more, see <a class="reference internal" href="dags.html#concepts-control-flow"><span class="std std-ref">Control Flow</span></a>.</p>
<p>Tasks don’t pass information to each other by default, and run entirely independently. If you want to pass information from one Task to another, you should use <a class="reference internal" href="xcoms.html"><span class="doc">XComs</span></a>.</p>
</div>
<div class="section" id="task-instances">
<span id="concepts-task-instances"></span><h2>Task Instances<a class="headerlink" href="#task-instances" title="Permalink to this headline"></a></h2>
<p>Much in the same way that a DAG is instantiated into a <a class="reference internal" href="dags.html#concepts-dag-run"><span class="std std-ref">DAG Run</span></a> each time it runs, the tasks under a DAG are instantiated into <em>Task Instances</em>.</p>
<p>An instance of a Task is a specific run of that task for a given DAG (and thus for a given <code class="docutils literal notranslate"><span class="pre">execution_date</span></code>). They are also the representation of a Task that has <em>state</em>, representing what stage of the lifecycle it is in.</p>
<p id="concepts-task-states">The possible states for a Task Instance are:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">none</span></code>: The Task has not yet been queued for execution (its dependencies are not yet met)</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">scheduled</span></code>: The scheduler has determined the Task’s dependencies are met and it should run</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">queued</span></code>: The task has been assigned to an Executor and is awaiting a worker</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">running</span></code>: The task is running on a worker (or on a local/synchronous executor)</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">success</span></code>: The task finished running without errors</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">failed</span></code>: The task had an error during execution and failed to run</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">skipped</span></code>: The task was skipped due to branching, LatestOnly, or similar.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">upstream_failed</span></code>: An upstream task failed and the <a class="reference internal" href="dags.html#concepts-trigger-rules"><span class="std std-ref">Trigger Rule</span></a> says we needed it</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">up_for_retry</span></code>: The task failed, but has retry attempts left and will be rescheduled.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">up_for_reschedule</span></code>: The task is a <a class="reference internal" href="sensors.html"><span class="doc">Sensor</span></a> that is in <code class="docutils literal notranslate"><span class="pre">reschedule</span></code> mode</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">sensing</span></code>: The task is a <a class="reference internal" href="smart-sensors.html"><span class="doc">Smart Sensor</span></a></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">removed</span></code>: The task has vanished from the DAG since the run started</p></li>
</ul>
<img alt="../_images/task_lifecycle_diagram.png" src="../_images/task_lifecycle_diagram.png" />
<p>Ideally, a task should flow from <code class="docutils literal notranslate"><span class="pre">none</span></code>, to <code class="docutils literal notranslate"><span class="pre">scheduled</span></code>, to <code class="docutils literal notranslate"><span class="pre">queued</span></code>, to <code class="docutils literal notranslate"><span class="pre">running</span></code>, and finally to <code class="docutils literal notranslate"><span class="pre">success</span></code>.</p>
<p>When any custom Task (Operator) is running, it will get a copy of the task instance passed to it; as well as being able to inspect task metadata, it also contains methods for things like <a class="reference internal" href="xcoms.html"><span class="doc">XComs</span></a>.</p>
<div class="section" id="relationship-terminology">
<h3>Relationship Terminology<a class="headerlink" href="#relationship-terminology" title="Permalink to this headline"></a></h3>
<p>For any given Task Instance, there are two types of relationships it has with other instances.</p>
<p>Firstly, it can have <em>upstream</em> and <em>downstream</em> tasks:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">task1</span> <span class="o">&gt;&gt;</span> <span class="n">task2</span> <span class="o">&gt;&gt;</span> <span class="n">task3</span>
</pre></div>
</div>
<p>When a DAG runs, it will create instances for each of these tasks that are upstream/downstream of each other, but which all have the same <code class="docutils literal notranslate"><span class="pre">execution_date</span></code>.</p>
<p>There may also be instances of the <em>same task</em>, but for different values of <code class="docutils literal notranslate"><span class="pre">execution_date</span></code> - from other runs of the same DAG. We call these <em>previous</em> and <em>next</em> - it is a different relationship to <em>upstream</em> and <em>downstream</em>!</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Some older Airflow documentation may still use “previous” to mean “upstream”. If you find an occurrence of this, please help us fix it!</p>
</div>
</div>
</div>
<div class="section" id="timeouts">
<span id="concepts-timeouts"></span><h2>Timeouts<a class="headerlink" href="#timeouts" title="Permalink to this headline"></a></h2>
<p>If you want a task to have a maximum runtime, set its <code class="docutils literal notranslate"><span class="pre">execution_timeout</span></code> attribute to a <code class="docutils literal notranslate"><span class="pre">datetime.timedelta</span></code> value that is the maximum permissible runtime. If it runs longer than this, Airflow will kick in and fail the task with a timeout exception.</p>
<p>If you merely want to be notified if a task runs over but still let it run to completion, you want <a class="reference internal" href="#concepts-slas"><span class="std std-ref">SLAs</span></a> instead.</p>
</div>
<div class="section" id="slas">
<span id="concepts-slas"></span><h2>SLAs<a class="headerlink" href="#slas" title="Permalink to this headline"></a></h2>
<p>An SLA, or a Service Level Agreement, is an expectation for the maximum time a Task should take. If a task takes longer than this to run, then it visible in the “SLA Misses” part of the user interface, as well going out in an email of all tasks that missed their SLA.</p>
<p>Tasks over their SLA are not cancelled, though - they are allowed to run to completion. If you want to cancel a task after a certain runtime is reached, you want <a class="reference internal" href="#concepts-timeouts"><span class="std std-ref">Timeouts</span></a> instead.</p>
<p>To set an SLA for a task, pass a <code class="docutils literal notranslate"><span class="pre">datetime.timedelta</span></code> object to the Task/Operator’s <code class="docutils literal notranslate"><span class="pre">sla</span></code> parameter. You can also supply an <code class="docutils literal notranslate"><span class="pre">sla_miss_callback</span></code> that will be called when the SLA is missed if you want to run your own logic.</p>
<p>If you want to disable SLA checking entirely, you can set <code class="docutils literal notranslate"><span class="pre">check_slas</span> <span class="pre">=</span> <span class="pre">False</span></code> in Airflow’s <code class="docutils literal notranslate"><span class="pre">[core]</span></code> configuration.</p>
<p>To read more about configuring the emails, see <a class="reference internal" href="../howto/email-config.html"><span class="doc">Email Configuration</span></a>.</p>
<div class="section" id="sla-miss-callback">
<span id="concepts-sla-miss-callback"></span><h3>sla_miss_callback<a class="headerlink" href="#sla-miss-callback" title="Permalink to this headline"></a></h3>
<p>You can also supply an <code class="docutils literal notranslate"><span class="pre">sla_miss_callback</span></code> that will be called when the SLA is missed if you want to run your own logic.
The function signature of an <code class="docutils literal notranslate"><span class="pre">sla_miss_callback</span></code> requires 5 parameters.</p>
<ol class="arabic">
<li><p><code class="docutils literal notranslate"><span class="pre">dag</span></code></p>
<blockquote>
<div><ul class="simple">
<li><p>Parent <a class="reference internal" href="dags.html#concepts-dags"><span class="std std-ref">DAG</span></a> Object for the <a class="reference internal" href="../dag-run.html"><span class="doc">DAGRun</span></a> in which tasks missed their
<a class="reference internal" href="#concepts-slas"><span class="std std-ref">SLA</span></a>.</p></li>
</ul>
</div></blockquote>
</li>
<li><p><code class="docutils literal notranslate"><span class="pre">task_list</span></code></p>
<blockquote>
<div><ul class="simple">
<li><p>String list (new-line separated, \n) of all tasks that missed their <a class="reference internal" href="#concepts-slas"><span class="std std-ref">SLA</span></a>
since the last time that the <code class="docutils literal notranslate"><span class="pre">sla_miss_callback</span></code> ran.</p></li>
</ul>
</div></blockquote>
</li>
<li><p><code class="docutils literal notranslate"><span class="pre">blocking_task_list</span></code></p>
<blockquote>
<div><ul class="simple">
<li><p>Any task in the <a class="reference internal" href="../dag-run.html"><span class="doc">DAGRun(s)</span></a> (with the same <code class="docutils literal notranslate"><span class="pre">execution_date</span></code> as a task that missed
<a class="reference internal" href="#concepts-slas"><span class="std std-ref">SLA</span></a>) that is not in a <strong>SUCCESS</strong> state at the time that the <code class="docutils literal notranslate"><span class="pre">sla_miss_callback</span></code>
runs. i.e. ‘running’, ‘failed’. These tasks are described as tasks that are blocking itself or another
task from completing before its SLA window is complete.</p></li>
</ul>
</div></blockquote>
</li>
<li><p><code class="docutils literal notranslate"><span class="pre">slas</span></code></p>
<blockquote>
<div><ul class="simple">
<li><p>List of <a class="reference internal" href="../_api/airflow/models/slamiss/index.html#module-airflow.models.slamiss" title="airflow.models.slamiss"><code class="xref py py-mod docutils literal notranslate"><span class="pre">SlaMiss</span></code></a> objects associated with the tasks in the
<code class="docutils literal notranslate"><span class="pre">task_list</span></code> parameter.</p></li>
</ul>
</div></blockquote>
</li>
<li><p><code class="docutils literal notranslate"><span class="pre">blocking_tis</span></code></p>
<blockquote>
<div><ul class="simple">
<li><p>List of the <a class="reference internal" href="#concepts-task-instances"><span class="std std-ref">TaskInstance</span></a> objects that are associated with the tasks
in the <code class="docutils literal notranslate"><span class="pre">blocking_task_list</span></code> parameter.</p></li>
</ul>
</div></blockquote>
</li>
</ol>
<p>Examples of <code class="docutils literal notranslate"><span class="pre">sla_miss_callback</span></code> function signature:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">my_sla_miss_callback</span><span class="p">(</span><span class="n">dag</span><span class="p">,</span> <span class="n">task_list</span><span class="p">,</span> <span class="n">blocking_task_list</span><span class="p">,</span> <span class="n">slas</span><span class="p">,</span> <span class="n">blocking_tis</span><span class="p">):</span>
<span class="o">...</span>
</pre></div>
</div>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">my_sla_miss_callback</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">):</span>
<span class="o">...</span>
</pre></div>
</div>
</div>
</div>
<div class="section" id="special-exceptions">
<h2>Special Exceptions<a class="headerlink" href="#special-exceptions" title="Permalink to this headline"></a></h2>
<p>If you want to control your task’s state from within custom Task/Operator code, Airflow provides two special exceptions you can raise:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">AirflowSkipException</span></code> will mark the current task as skipped</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">AirflowFailException</span></code> will mark the current task as failed <em>ignoring any remaining retry attempts</em></p></li>
</ul>
<p>These can be useful if your code has extra knowledge about its environment and wants to fail/skip faster - e.g., skipping when it knows there’s no data available, or fast-failing when it detects its API key is invalid (as that will not be fixed by a retry).</p>
</div>
<div class="section" id="zombie-undead-tasks">
<h2>Zombie/Undead Tasks<a class="headerlink" href="#zombie-undead-tasks" title="Permalink to this headline"></a></h2>
<p>No system runs perfectly, and task instances are expected to die once in a while. Airflow detects two kinds of task/process mismatch:</p>
<ul class="simple">
<li><p><em>Zombie tasks</em> are tasks that are supposed to be running but suddenly died (e.g. their process was killed, or the machine died). Airflow will find these periodically, clean them up, and either fail or retry the task depending on its settings.</p></li>
<li><p><em>Undead tasks</em> are tasks that are <em>not</em> supposed to be running but are, often caused when you manually edit Task Instances via the UI. Airflow will find them periodically and terminate them.</p></li>
</ul>
</div>
<div class="section" id="executor-configuration">
<h2>Executor Configuration<a class="headerlink" href="#executor-configuration" title="Permalink to this headline"></a></h2>
<p>Some <a class="reference internal" href="../executor/index.html"><span class="doc">Executors</span></a> allow optional per-task configuration - such as the <code class="docutils literal notranslate"><span class="pre">KubernetesExecutor</span></code>, which lets you set an image to run the task on.</p>
<p>This is achieved via the <code class="docutils literal notranslate"><span class="pre">executor_config</span></code> argument to a Task or Operator. Here’s an example of setting the Docker image for a task that will run on the <code class="docutils literal notranslate"><span class="pre">KubernetesExecutor</span></code>:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">MyOperator</span><span class="p">(</span><span class="o">...</span><span class="p">,</span>
<span class="n">executor_config</span><span class="o">=</span><span class="p">{</span>
<span class="s2">&quot;KubernetesExecutor&quot;</span><span class="p">:</span>
<span class="p">{</span><span class="s2">&quot;image&quot;</span><span class="p">:</span> <span class="s2">&quot;myCustomDockerImage&quot;</span><span class="p">}</span>
<span class="p">}</span>
<span class="p">)</span>
</pre></div>
</div>
<p>The settings you can pass into <code class="docutils literal notranslate"><span class="pre">executor_config</span></code> vary by executor, so read the <a class="reference internal" href="../executor/index.html"><span class="doc">individual executor documentation</span></a> in order to see what you can set.</p>
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