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| <div class="section" id="module-airflow.models.serialized_dag"> |
| <span id="airflow-models-serialized-dag"></span><h1><a class="reference internal" href="#module-airflow.models.serialized_dag" title="airflow.models.serialized_dag"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.serialized_dag</span></code></a><a class="headerlink" href="#module-airflow.models.serialized_dag" title="Permalink to this headline">¶</a></h1> |
| <p><p>Serialzed DAG table in database.</p> |
| </p> |
| <div class="section" id="module-contents"> |
| <h2>Module Contents<a class="headerlink" href="#module-contents" title="Permalink to this headline">¶</a></h2> |
| <dl class="data"> |
| <dt id="airflow.models.serialized_dag.log"> |
| <code class="sig-prename descclassname">airflow.models.serialized_dag.</code><code class="sig-name descname">log</code><a class="reference internal" href="../../../../_modules/airflow/models/serialized_dag.html#log"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.models.serialized_dag.log" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="class"> |
| <dt id="airflow.models.serialized_dag.SerializedDagModel"> |
| <em class="property">class </em><code class="sig-prename descclassname">airflow.models.serialized_dag.</code><code class="sig-name descname">SerializedDagModel</code><span class="sig-paren">(</span><em class="sig-param">dag</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/models/serialized_dag.html#SerializedDagModel"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.models.serialized_dag.SerializedDagModel" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference internal" href="../base/index.html#airflow.models.base.Base" title="airflow.models.base.Base"><code class="xref py py-class docutils literal notranslate"><span class="pre">airflow.models.base.Base</span></code></a></p> |
| <p>A table for serialized DAGs.</p> |
| <p>serialized_dag table is a snapshot of DAG files synchronized by scheduler. |
| This feature is controlled by:</p> |
| <ul class="simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">[core]</span> <span class="pre">store_serialized_dags</span> <span class="pre">=</span> <span class="pre">True</span></code>: enable this feature</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">[core]</span> <span class="pre">min_serialized_dag_update_interval</span> <span class="pre">=</span> <span class="pre">30</span></code> (s): |
| serialized DAGs are updated in DB when a file gets processed by scheduler, |
| to reduce DB write rate, there is a minimal interval of updating serialized DAGs.</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">[scheduler]</span> <span class="pre">dag_dir_list_interval</span> <span class="pre">=</span> <span class="pre">300</span></code> (s): |
| interval of deleting serialized DAGs in DB when the files are deleted, suggest |
| to use a smaller interval such as 60</p></li> |
| </ul> |
| <p>It is used by webserver to load dagbags when <code class="docutils literal notranslate"><span class="pre">store_serialized_dags=True</span></code>. |
| Because reading from database is lightweight compared to importing from files, |
| it solves the webserver scalability issue.</p> |
| <dl class="attribute"> |
| <dt id="airflow.models.serialized_dag.SerializedDagModel.__tablename__"> |
| <code class="sig-name descname">__tablename__</code><em class="property"> = serialized_dag</em><a class="reference internal" href="../../../../_modules/airflow/models/serialized_dag.html#SerializedDagModel.__tablename__"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.models.serialized_dag.SerializedDagModel.__tablename__" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="attribute"> |
| <dt id="airflow.models.serialized_dag.SerializedDagModel.dag_id"> |
| <code class="sig-name descname">dag_id</code><a class="reference internal" href="../../../../_modules/airflow/models/serialized_dag.html#SerializedDagModel.dag_id"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.models.serialized_dag.SerializedDagModel.dag_id" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="attribute"> |
| <dt id="airflow.models.serialized_dag.SerializedDagModel.fileloc"> |
| <code class="sig-name descname">fileloc</code><a class="reference internal" href="../../../../_modules/airflow/models/serialized_dag.html#SerializedDagModel.fileloc"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.models.serialized_dag.SerializedDagModel.fileloc" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="attribute"> |
| <dt id="airflow.models.serialized_dag.SerializedDagModel.fileloc_hash"> |
| <code class="sig-name descname">fileloc_hash</code><a class="reference internal" href="../../../../_modules/airflow/models/serialized_dag.html#SerializedDagModel.fileloc_hash"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.models.serialized_dag.SerializedDagModel.fileloc_hash" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="attribute"> |
| <dt id="airflow.models.serialized_dag.SerializedDagModel.data"> |
| <code class="sig-name descname">data</code><a class="reference internal" href="../../../../_modules/airflow/models/serialized_dag.html#SerializedDagModel.data"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.models.serialized_dag.SerializedDagModel.data" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="attribute"> |
| <dt id="airflow.models.serialized_dag.SerializedDagModel.last_updated"> |
| <code class="sig-name descname">last_updated</code><a class="reference internal" href="../../../../_modules/airflow/models/serialized_dag.html#SerializedDagModel.last_updated"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.models.serialized_dag.SerializedDagModel.last_updated" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="attribute"> |
| <dt id="airflow.models.serialized_dag.SerializedDagModel.__table_args__"> |
| <code class="sig-name descname">__table_args__</code><a class="reference internal" href="../../../../_modules/airflow/models/serialized_dag.html#SerializedDagModel.__table_args__"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.models.serialized_dag.SerializedDagModel.__table_args__" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="attribute"> |
| <dt id="airflow.models.serialized_dag.SerializedDagModel.dag"> |
| <code class="sig-name descname">dag</code><a class="reference internal" href="../../../../_modules/airflow/models/serialized_dag.html#SerializedDagModel.dag"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.models.serialized_dag.SerializedDagModel.dag" title="Permalink to this definition">¶</a></dt> |
| <dd><p>The DAG deserialized from the <code class="docutils literal notranslate"><span class="pre">data</span></code> column</p> |
| </dd></dl> |
| |
| <dl class="method"> |
| <dt id="airflow.models.serialized_dag.SerializedDagModel.dag_fileloc_hash"> |
| <em class="property">static </em><code class="sig-name descname">dag_fileloc_hash</code><span class="sig-paren">(</span><em class="sig-param">full_filepath</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/models/serialized_dag.html#SerializedDagModel.dag_fileloc_hash"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.models.serialized_dag.SerializedDagModel.dag_fileloc_hash" title="Permalink to this definition">¶</a></dt> |
| <dd><p>“Hashing file location for indexing.</p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Parameters</dt> |
| <dd class="field-odd"><p><strong>full_filepath</strong> – full filepath of DAG file</p> |
| </dd> |
| <dt class="field-even">Returns</dt> |
| <dd class="field-even"><p>hashed full_filepath</p> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| <dl class="method"> |
| <dt id="airflow.models.serialized_dag.SerializedDagModel.write_dag"> |
| <em class="property">classmethod </em><code class="sig-name descname">write_dag</code><span class="sig-paren">(</span><em class="sig-param">cls</em>, <em class="sig-param">dag</em>, <em class="sig-param">min_update_interval=None</em>, <em class="sig-param">session=None</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/models/serialized_dag.html#SerializedDagModel.write_dag"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.models.serialized_dag.SerializedDagModel.write_dag" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Serializes a DAG and writes it into database.</p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Parameters</dt> |
| <dd class="field-odd"><ul class="simple"> |
| <li><p><strong>dag</strong> – a DAG to be written into database</p></li> |
| <li><p><strong>min_update_interval</strong> – minimal interval in seconds to update serialized DAG</p></li> |
| <li><p><strong>session</strong> – ORM Session</p></li> |
| </ul> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| <dl class="method"> |
| <dt id="airflow.models.serialized_dag.SerializedDagModel.read_all_dags"> |
| <em class="property">classmethod </em><code class="sig-name descname">read_all_dags</code><span class="sig-paren">(</span><em class="sig-param">cls</em>, <em class="sig-param">session=None</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/models/serialized_dag.html#SerializedDagModel.read_all_dags"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.models.serialized_dag.SerializedDagModel.read_all_dags" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Reads all DAGs in serialized_dag table.</p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Parameters</dt> |
| <dd class="field-odd"><p><strong>session</strong> – ORM Session</p> |
| </dd> |
| <dt class="field-even">Returns</dt> |
| <dd class="field-even"><p>a dict of DAGs read from database</p> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| <dl class="method"> |
| <dt id="airflow.models.serialized_dag.SerializedDagModel.remove_dag"> |
| <em class="property">classmethod </em><code class="sig-name descname">remove_dag</code><span class="sig-paren">(</span><em class="sig-param">cls</em>, <em class="sig-param">dag_id</em>, <em class="sig-param">session=None</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/models/serialized_dag.html#SerializedDagModel.remove_dag"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.models.serialized_dag.SerializedDagModel.remove_dag" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Deletes a DAG with given dag_id.</p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Parameters</dt> |
| <dd class="field-odd"><ul class="simple"> |
| <li><p><strong>dag_id</strong> (<a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.8)"><em>str</em></a>) – dag_id to be deleted</p></li> |
| <li><p><strong>session</strong> – ORM Session</p></li> |
| </ul> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| <dl class="method"> |
| <dt id="airflow.models.serialized_dag.SerializedDagModel.remove_deleted_dags"> |
| <em class="property">classmethod </em><code class="sig-name descname">remove_deleted_dags</code><span class="sig-paren">(</span><em class="sig-param">cls</em>, <em class="sig-param">alive_dag_filelocs</em>, <em class="sig-param">session=None</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/models/serialized_dag.html#SerializedDagModel.remove_deleted_dags"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.models.serialized_dag.SerializedDagModel.remove_deleted_dags" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Deletes DAGs not included in alive_dag_filelocs.</p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Parameters</dt> |
| <dd class="field-odd"><ul class="simple"> |
| <li><p><strong>alive_dag_filelocs</strong> (<a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#list" title="(in Python v3.8)"><em>list</em></a>) – file paths of alive DAGs</p></li> |
| <li><p><strong>session</strong> – ORM Session</p></li> |
| </ul> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| <dl class="method"> |
| <dt id="airflow.models.serialized_dag.SerializedDagModel.has_dag"> |
| <em class="property">classmethod </em><code class="sig-name descname">has_dag</code><span class="sig-paren">(</span><em class="sig-param">cls</em>, <em class="sig-param">dag_id</em>, <em class="sig-param">session=None</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/models/serialized_dag.html#SerializedDagModel.has_dag"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.models.serialized_dag.SerializedDagModel.has_dag" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Checks a DAG exist in serialized_dag table.</p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Parameters</dt> |
| <dd class="field-odd"><ul class="simple"> |
| <li><p><strong>dag_id</strong> (<a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.8)"><em>str</em></a>) – the DAG to check</p></li> |
| <li><p><strong>session</strong> – ORM Session</p></li> |
| </ul> |
| </dd> |
| <dt class="field-even">Return type</dt> |
| <dd class="field-even"><p><a class="reference external" href="https://docs.python.org/3/library/functions.html#bool" title="(in Python v3.8)">bool</a></p> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| <dl class="method"> |
| <dt id="airflow.models.serialized_dag.SerializedDagModel.get"> |
| <em class="property">classmethod </em><code class="sig-name descname">get</code><span class="sig-paren">(</span><em class="sig-param">cls</em>, <em class="sig-param">dag_id</em>, <em class="sig-param">session=None</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/models/serialized_dag.html#SerializedDagModel.get"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.models.serialized_dag.SerializedDagModel.get" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Get the SerializedDAG for the given dag ID. |
| It will cope with being passed the ID of a subdag by looking up the |
| root dag_id from the DAG table.</p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Parameters</dt> |
| <dd class="field-odd"><ul class="simple"> |
| <li><p><strong>dag_id</strong> – the DAG to fetch</p></li> |
| <li><p><strong>session</strong> – ORM Session</p></li> |
| </ul> |
| </dd> |
| </dl> |
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