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<blockquote>
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<div class="section" id="xcoms">
<span id="concepts-xcom"></span><h1>XComs<a class="headerlink" href="#xcoms" title="Permalink to this headline"></a></h1>
<p>XComs (short for &quot;cross-communications&quot;) are a mechanism that let <a class="reference internal" href="tasks.html"><span class="doc">Tasks</span></a> talk to each other, as by default Tasks are entirely isolated and may be running on entirely different machines.</p>
<p>An XCom is identified by a <code class="docutils literal notranslate"><span class="pre">key</span></code> (essentially its name), as well as the <code class="docutils literal notranslate"><span class="pre">task_id</span></code> and <code class="docutils literal notranslate"><span class="pre">dag_id</span></code> it came from. They can have any (serializable) value, but they are only designed for small amounts of data; do not use them to pass around large values, like dataframes.</p>
<p>XComs are explicitly &quot;pushed&quot; and &quot;pulled&quot; to/from their storage using the <code class="docutils literal notranslate"><span class="pre">xcom_push</span></code> and <code class="docutils literal notranslate"><span class="pre">xcom_pull</span></code> methods on Task Instances. Many operators will auto-push their results into an XCom key called <code class="docutils literal notranslate"><span class="pre">return_value</span></code> if the <code class="docutils literal notranslate"><span class="pre">do_xcom_push</span></code> argument is set to <code class="docutils literal notranslate"><span class="pre">True</span></code> (as it is by default), and <code class="docutils literal notranslate"><span class="pre">&#64;task</span></code> functions do this as well.</p>
<p><code class="docutils literal notranslate"><span class="pre">xcom_pull</span></code> defaults to using this key if no key is passed to it, meaning it's possible to write code like this:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1"># Pulls the return_value XCOM from &quot;pushing_task&quot;</span>
<span class="n">value</span> <span class="o">=</span> <span class="n">task_instance</span><span class="o">.</span><span class="n">xcom_pull</span><span class="p">(</span><span class="n">task_ids</span><span class="o">=</span><span class="s1">&#39;pushing_task&#39;</span><span class="p">)</span>
</pre></div>
</div>
<p>You can also use XComs in <a class="reference internal" href="operators.html#concepts-jinja-templating"><span class="std std-ref">templates</span></a>:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">SELECT</span> <span class="o">*</span> <span class="n">FROM</span> <span class="p">{{</span> <span class="n">task_instance</span><span class="o">.</span><span class="n">xcom_pull</span><span class="p">(</span><span class="n">task_ids</span><span class="o">=</span><span class="s1">&#39;foo&#39;</span><span class="p">,</span> <span class="n">key</span><span class="o">=</span><span class="s1">&#39;table_name&#39;</span><span class="p">)</span> <span class="p">}}</span>
</pre></div>
</div>
<p>XComs are a relative of <a class="reference internal" href="variables.html"><span class="doc">Variables</span></a>, with the main difference being that XComs are per-task-instance and designed for communication within a DAG run, while Variables are global and designed for overall configuration and value sharing.</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Note</span><span class="p">:</span> <span class="n">If</span> <span class="n">the</span> <span class="n">first</span> <span class="n">task</span> <span class="n">run</span> <span class="ow">is</span> <span class="ow">not</span> <span class="n">succeeded</span> <span class="n">then</span> <span class="n">on</span> <span class="n">every</span> <span class="n">retry</span> <span class="n">task</span> <span class="n">XComs</span> <span class="n">will</span> <span class="n">be</span> <span class="n">cleared</span> <span class="n">to</span> <span class="n">make</span> <span class="n">the</span> <span class="n">task</span> <span class="n">run</span> <span class="n">idempotent</span><span class="o">.</span>
</pre></div>
</div>
<div class="section" id="custom-xcom-backends">
<h2>Custom XCom Backends<a class="headerlink" href="#custom-xcom-backends" title="Permalink to this headline"></a></h2>
<p>The XCom system has interchangeable backends, and you can set which backend is being used via the <code class="docutils literal notranslate"><span class="pre">xcom_backend</span></code> configuration option.</p>
<p>If you want to implement your own backend, you should subclass <a class="reference internal" href="../_api/airflow/models/xcom/index.html#airflow.models.xcom.BaseXCom" title="airflow.models.xcom.BaseXCom"><code class="xref py py-class docutils literal notranslate"><span class="pre">BaseXCom</span></code></a>, and override the <code class="docutils literal notranslate"><span class="pre">serialize_value</span></code> and <code class="docutils literal notranslate"><span class="pre">deserialize_value</span></code> methods.</p>
<p>There is also an <code class="docutils literal notranslate"><span class="pre">orm_deserialize_value</span></code> method that is called whenever the XCom objects are rendered for UI or reporting purposes; if you have large or expensive-to-retrieve values in your XComs, you should override this method to avoid calling that code (and instead return a lighter, incomplete representation) so the UI remains responsive.</p>
<p>You can also override the <code class="docutils literal notranslate"><span class="pre">clear</span></code> method and use it when clearing results for given dags and tasks. This allows the custom XCom backend to process the data lifecycle easier.</p>
</div>
<div class="section" id="working-with-custom-xcom-backends-in-containers">
<h2>Working with Custom XCom Backends in Containers<a class="headerlink" href="#working-with-custom-xcom-backends-in-containers" title="Permalink to this headline"></a></h2>
<p>Depending on where Airflow is deployed i.e., local, Docker, K8s, etc. it can be useful to be assured that a custom XCom backend is actually being initialized. For example, the complexity of the container environment can make it more difficult to determine if your backend is being loaded correctly during container deployment. Luckily the following guidance can be used to assist you in building confidence in your custom XCom implementation.</p>
<p>Firstly, if you can exec into a terminal in the container then you should be able to do:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">airflow.models.xcom</span> <span class="kn">import</span> <span class="n">XCom</span>
<span class="nb">print</span><span class="p">(</span><span class="n">XCom</span><span class="o">.</span><span class="vm">__name__</span><span class="p">)</span>
</pre></div>
</div>
<p>which will print the actual class that is being used.</p>
<p>You can also examine Airflow's configuration:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">airflow.settings</span> <span class="kn">import</span> <span class="n">conf</span>
<span class="n">conf</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;core&quot;</span><span class="p">,</span> <span class="s2">&quot;xcom_backend&quot;</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="working-with-custom-backends-in-k8s-via-helm">
<h2>Working with Custom Backends in K8s via Helm<a class="headerlink" href="#working-with-custom-backends-in-k8s-via-helm" title="Permalink to this headline"></a></h2>
<p>Running custom XCom backends in K8s will introduce even more complexity to you Airflow deployment. Put simply, sometimes things go wrong which can be difficult to debug.</p>
<p>For example, if you define a custom XCom backend in the Chart <code class="docutils literal notranslate"><span class="pre">values.yaml</span></code> (via the <code class="docutils literal notranslate"><span class="pre">xcom_backend</span></code> configuration) and Airflow fails to load the class, the entire Chart deployment will fail with each pod container attempting to restart time and time again.</p>
<p>When deploying in K8s your custom XCom backend needs to be reside in a <code class="docutils literal notranslate"><span class="pre">config</span></code> directory otherwise it cannot be located during Chart deployment.</p>
<p>An observed problem is that it is very difficult to acquire logs from the container because there is a very small window of availability where the trace can be obtained. The only way you can determine the root cause is if you are fortunate enough to query and acquire the container logs at the right time. This in turn prevents the entire Helm chart from deploying successfully.</p>
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