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<p class="caption" role="heading"><span class="caption-text">Content</span></p>
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<li class="toctree-l2"><a class="reference internal" href="add-dag-tags.html">Add tags to DAGs and use it for filtering in the UI</a></li>
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<blockquote>
<div></div></blockquote>
<div class="section" id="dynamic-dag-generation">
<h1>Dynamic DAG Generation<a class="headerlink" href="#dynamic-dag-generation" title="Permalink to this heading"></a></h1>
<p>To have a task repeated based on the output/result of a previous task see <a class="reference internal" href="../concepts/dynamic-task-mapping.html"><span class="doc">Dynamic Task Mapping</span></a>.</p>
<div class="section" id="dynamic-dags-with-environment-variables">
<h2>Dynamic DAGs with environment variables<a class="headerlink" href="#dynamic-dags-with-environment-variables" title="Permalink to this heading"></a></h2>
<p>If you want to use variables to configure your code, you should always use
<a class="reference external" href="https://wiki.archlinux.org/title/environment_variables">environment variables</a> in your
top-level code rather than <a class="reference internal" href="../concepts/variables.html"><span class="doc">Airflow Variables</span></a>. Using Airflow Variables
at top-level code creates a connection to metadata DB of Airflow to fetch the value, which can slow
down parsing and place extra load on the DB. See the <a class="reference external" href="_best_practices/airflow_variables">Airflow Variables</a>
on how to make best use of Airflow Variables in your DAGs using Jinja templates .</p>
<p>For example you could set <code class="docutils literal notranslate"><span class="pre">DEPLOYMENT</span></code> variable differently for your production and development
environments. The variable <code class="docutils literal notranslate"><span class="pre">DEPLOYMENT</span></code> could be set to <code class="docutils literal notranslate"><span class="pre">PROD</span></code> in your production environment and to
<code class="docutils literal notranslate"><span class="pre">DEV</span></code> in your development environment. Then you could build your dag differently in production and
development environment, depending on the value of the environment variable.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">deployment</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;DEPLOYMENT&quot;</span><span class="p">,</span> <span class="s2">&quot;PROD&quot;</span><span class="p">)</span>
<span class="k">if</span> <span class="n">deployment</span> <span class="o">==</span> <span class="s2">&quot;PROD&quot;</span><span class="p">:</span>
<span class="n">task</span> <span class="o">=</span> <span class="n">Operator</span><span class="p">(</span><span class="n">param</span><span class="o">=</span><span class="s2">&quot;prod-param&quot;</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">deployment</span> <span class="o">==</span> <span class="s2">&quot;DEV&quot;</span><span class="p">:</span>
<span class="n">task</span> <span class="o">=</span> <span class="n">Operator</span><span class="p">(</span><span class="n">param</span><span class="o">=</span><span class="s2">&quot;dev-param&quot;</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="generating-python-code-with-embedded-meta-data">
<h2>Generating Python code with embedded meta-data<a class="headerlink" href="#generating-python-code-with-embedded-meta-data" title="Permalink to this heading"></a></h2>
<p>You can externally generate Python code containing the meta-data as importable constants.
Such constant can then be imported directly by your DAG and used to construct the object and build
the dependencies. This makes it easy to import such code from multiple DAGs without the need to find,
load and parse the meta-data stored in the constant - this is done automatically by Python interpreter
when it processes the “import” statement. This sounds strange at first, but it is surprisingly easy
to generate such code and make sure this is a valid Python code that you can import from your DAGs.</p>
<p>For example assume you dynamically generate (in your DAG folder), the <code class="docutils literal notranslate"><span class="pre">my_company_utils/common.py</span></code> file:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># This file is generated automatically !</span>
<span class="n">ALL_TASKS</span> <span class="o">=</span> <span class="p">[</span><span class="s2">&quot;task1&quot;</span><span class="p">,</span> <span class="s2">&quot;task2&quot;</span><span class="p">,</span> <span class="s2">&quot;task3&quot;</span><span class="p">]</span>
</pre></div>
</div>
<p>Then you can import and use the <code class="docutils literal notranslate"><span class="pre">ALL_TASKS</span></code> constant in all your DAGs like that:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">my_company_utils.common</span> <span class="kn">import</span> <span class="n">ALL_TASKS</span>
<span class="k">with</span> <span class="n">DAG</span><span class="p">(</span>
<span class="n">dag_id</span><span class="o">=</span><span class="s2">&quot;my_dag&quot;</span><span class="p">,</span>
<span class="n">schedule</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
<span class="n">start_date</span><span class="o">=</span><span class="n">datetime</span><span class="p">(</span><span class="mi">2021</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">),</span>
<span class="n">catchup</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span>
<span class="p">):</span>
<span class="k">for</span> <span class="n">task</span> <span class="ow">in</span> <span class="n">ALL_TASKS</span><span class="p">:</span>
<span class="c1"># create your operators and relations here</span>
<span class="o">...</span>
</pre></div>
</div>
<p>Don’t forget that in this case you need to add empty <code class="docutils literal notranslate"><span class="pre">__init__.py</span></code> file in the <code class="docutils literal notranslate"><span class="pre">my_company_utils</span></code> folder
and you should add the <code class="docutils literal notranslate"><span class="pre">my_company_utils/.*</span></code> line to <code class="docutils literal notranslate"><span class="pre">.airflowignore</span></code> file (if using the regexp ignore
syntax), so that the whole folder is ignored by the scheduler when it looks for DAGs.</p>
</div>
<div class="section" id="dynamic-dags-with-external-configuration-from-a-structured-data-file">
<h2>Dynamic DAGs with external configuration from a structured data file<a class="headerlink" href="#dynamic-dags-with-external-configuration-from-a-structured-data-file" title="Permalink to this heading"></a></h2>
<p>If you need to use a more complex meta-data to prepare your DAG structure and you would prefer to keep the
data in a structured non-python format, you should export the data to the DAG folder in a file and push
it to the DAG folder, rather than try to pull the data by the DAG’s top-level code - for the reasons
explained in the parent <a class="reference internal" href="../best-practices.html#best-practices-top-level-code"><span class="std std-ref">Top level Python Code</span></a>.</p>
<p>The meta-data should be exported and stored together with the DAGs in a convenient file format (JSON, YAML
formats are good candidates) in DAG folder. Ideally, the meta-data should be published in the same
package/folder as the module of the DAG file you load it from, because then you can find location of
the meta-data file in your DAG easily. The location of the file to read can be found using the
<code class="docutils literal notranslate"><span class="pre">__file__</span></code> attribute of the module containing the DAG:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">my_dir</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">dirname</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">abspath</span><span class="p">(</span><span class="vm">__file__</span><span class="p">))</span>
<span class="n">configuration_file_path</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">my_dir</span><span class="p">,</span> <span class="s2">&quot;config.yaml&quot;</span><span class="p">)</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">configuration_file_path</span><span class="p">)</span> <span class="k">as</span> <span class="n">yaml_file</span><span class="p">:</span>
<span class="n">configuration</span> <span class="o">=</span> <span class="n">yaml</span><span class="o">.</span><span class="n">safe_load</span><span class="p">(</span><span class="n">yaml_file</span><span class="p">)</span>
<span class="c1"># Configuration dict is available here</span>
</pre></div>
</div>
</div>
<div class="section" id="registering-dynamic-dags">
<h2>Registering dynamic DAGs<a class="headerlink" href="#registering-dynamic-dags" title="Permalink to this heading"></a></h2>
<p>You can dynamically generate DAGs when using the <code class="docutils literal notranslate"><span class="pre">&#64;dag</span></code> decorator or the <code class="docutils literal notranslate"><span class="pre">with</span> <span class="pre">DAG(..)</span></code> context manager
and Airflow will automatically register them.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">datetime</span> <span class="kn">import</span> <span class="n">datetime</span>
<span class="kn">from</span> <span class="nn">airflow.decorators</span> <span class="kn">import</span> <span class="n">dag</span><span class="p">,</span> <span class="n">task</span>
<span class="n">configs</span> <span class="o">=</span> <span class="p">{</span>
<span class="s2">&quot;config1&quot;</span><span class="p">:</span> <span class="p">{</span><span class="s2">&quot;message&quot;</span><span class="p">:</span> <span class="s2">&quot;first DAG will receive this message&quot;</span><span class="p">},</span>
<span class="s2">&quot;config2&quot;</span><span class="p">:</span> <span class="p">{</span><span class="s2">&quot;message&quot;</span><span class="p">:</span> <span class="s2">&quot;second DAG will receive this message&quot;</span><span class="p">},</span>
<span class="p">}</span>
<span class="k">for</span> <span class="n">config_name</span><span class="p">,</span> <span class="n">config</span> <span class="ow">in</span> <span class="n">configs</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
<span class="n">dag_id</span> <span class="o">=</span> <span class="sa">f</span><span class="s2">&quot;dynamic_generated_dag_</span><span class="si">{</span><span class="n">config_name</span><span class="si">}</span><span class="s2">&quot;</span>
<span class="nd">@dag</span><span class="p">(</span><span class="n">dag_id</span><span class="o">=</span><span class="n">dag_id</span><span class="p">,</span> <span class="n">start_date</span><span class="o">=</span><span class="n">datetime</span><span class="p">(</span><span class="mi">2022</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">1</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">dynamic_generated_dag</span><span class="p">():</span>
<span class="nd">@task</span>
<span class="k">def</span> <span class="nf">print_message</span><span class="p">(</span><span class="n">message</span><span class="p">):</span>
<span class="nb">print</span><span class="p">(</span><span class="n">message</span><span class="p">)</span>
<span class="n">print_message</span><span class="p">(</span><span class="n">config</span><span class="p">[</span><span class="s2">&quot;message&quot;</span><span class="p">])</span>
<span class="n">dynamic_generated_dag</span><span class="p">()</span>
</pre></div>
</div>
<p>The code below will generate a DAG for each config: <code class="docutils literal notranslate"><span class="pre">dynamic_generated_dag_config1</span></code> and <code class="docutils literal notranslate"><span class="pre">dynamic_generated_dag_config2</span></code>.
Each of them can run separately with related configuration.</p>
<p>If you do not wish to have DAGs auto-registered, you can disable the behavior by setting <code class="docutils literal notranslate"><span class="pre">auto_register=False</span></code> on your DAG.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 2.4: </span>As of version 2.4 DAGs that are created by calling a <code class="docutils literal notranslate"><span class="pre">&#64;dag</span></code> decorated function (or that are used in the
<code class="docutils literal notranslate"><span class="pre">with</span> <span class="pre">DAG(...)</span></code> context manager are automatically registered, and no longer need to be stored in a
global variable.</p>
</div>
<div class="section" id="optimizing-dag-parsing-delays-during-execution">
<h3>Optimizing DAG parsing delays during execution<a class="headerlink" href="#optimizing-dag-parsing-delays-during-execution" title="Permalink to this heading"></a></h3>
<div class="versionadded">
<p><span class="versionmodified added">New in version 2.4.</span></p>
</div>
<p>This is an <a class="reference internal" href="../release-process.html#experimental"><span class="std std-ref">experimental feature</span></a>.</p>
<p>Sometimes when you generate a lot of Dynamic DAGs from a single DAG file, it might cause unnecessary delays
when the DAG file is parsed during task execution. The impact is a delay before a task starts.</p>
<p>Why is this happening? You might not be aware but just before your task is executed,
Airflow parses the Python file the DAG comes from.</p>
<p>The Airflow Scheduler (or rather DAG File Processor) requires loading of a complete DAG file to process
all metadata. However, task execution requires only a single DAG object to execute a task. Knowing this,
we can skip the generation of unnecessary DAG objects when a task is executed, shortening the parsing time.
This optimization is most effective when the number of generated DAGs is high.</p>
<p>There is an experimental approach that you can take to optimize this behaviour. Note that it is not always
possible to use (for example when generation of subsequent DAGs depends on the previous DAGs) or when
there are some side-effects of your DAGs generation. Also the code snippet below is pretty complex and while
we tested it and it works in most circumstances, there might be cases where detection of the currently
parsed DAG will fail and it will revert to creating all the DAGs or fail. Use this solution with care and
test it thoroughly.</p>
<p>A nice example of performance improvements you can gain is shown in the
<a class="reference external" href="https://medium.com/apache-airflow/airflows-magic-loop-ec424b05b629">Airflow’s Magic Loop</a> blog post
that describes how parsing during task execution was reduced from 120 seconds to 200 ms. (The example was
written before Airflow 2.4 so it uses undocumented behaviour of Airflow.)</p>
<p>In Airflow 2.4 instead you can use <a class="reference internal" href="../_api/airflow/utils/dag_parsing_context/index.html#airflow.utils.dag_parsing_context.get_parsing_context" title="airflow.utils.dag_parsing_context.get_parsing_context"><code class="xref py py-meth docutils literal notranslate"><span class="pre">get_parsing_context()</span></code></a> method
to retrieve the current context in documented and predictable way.</p>
<p>Upon iterating over the collection of things to generate DAGs for, you can use the context to determine
whether you need to generate all DAG objects (when parsing in the DAG File processor), or to generate only
a single DAG object (when executing the task).</p>
<p>The <a class="reference internal" href="../_api/airflow/utils/dag_parsing_context/index.html#airflow.utils.dag_parsing_context.get_parsing_context" title="airflow.utils.dag_parsing_context.get_parsing_context"><code class="xref py py-meth docutils literal notranslate"><span class="pre">get_parsing_context()</span></code></a> return the current parsing
context. The context is of <a class="reference internal" href="../_api/airflow/utils/dag_parsing_context/index.html#airflow.utils.dag_parsing_context.AirflowParsingContext" title="airflow.utils.dag_parsing_context.AirflowParsingContext"><code class="xref py py-class docutils literal notranslate"><span class="pre">AirflowParsingContext</span></code></a> and
in case only single dag/task is needed, it contains <code class="docutils literal notranslate"><span class="pre">dag_id</span></code> and <code class="docutils literal notranslate"><span class="pre">task_id</span></code> fields set.
In case “full” parsing is needed (for example in DAG File Processor), <code class="docutils literal notranslate"><span class="pre">dag_id</span></code> and <code class="docutils literal notranslate"><span class="pre">task_id</span></code>
of the context are set to <code class="docutils literal notranslate"><span class="pre">None</span></code>.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">airflow.models.dag</span> <span class="kn">import</span> <span class="n">DAG</span>
<span class="kn">from</span> <span class="nn">airflow.utils.dag_parsing_context</span> <span class="kn">import</span> <span class="n">get_parsing_context</span>
<span class="hll"><span class="n">current_dag_id</span> <span class="o">=</span> <span class="n">get_parsing_context</span><span class="p">()</span><span class="o">.</span><span class="n">dag_id</span>
</span>
<span class="k">for</span> <span class="n">thing</span> <span class="ow">in</span> <span class="n">list_of_things</span><span class="p">:</span>
<span class="n">dag_id</span> <span class="o">=</span> <span class="sa">f</span><span class="s2">&quot;generated_dag_</span><span class="si">{</span><span class="n">thing</span><span class="si">}</span><span class="s2">&quot;</span>
<span class="hll"> <span class="k">if</span> <span class="n">current_dag_id</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span> <span class="ow">and</span> <span class="n">current_dag_id</span> <span class="o">!=</span> <span class="n">dag_id</span><span class="p">:</span>
</span><span class="hll"> <span class="k">continue</span> <span class="c1"># skip generation of non-selected DAG</span>
</span>
<span class="k">with</span> <span class="n">DAG</span><span class="p">(</span><span class="n">dag_id</span><span class="o">=</span><span class="n">dag_id</span><span class="p">,</span> <span class="o">...</span><span class="p">):</span>
<span class="o">...</span>
</pre></div>
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<li><a class="reference internal" href="#generating-python-code-with-embedded-meta-data">Generating Python code with embedded meta-data</a></li>
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