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| <li class="toctree-l1"><a class="reference internal" href="start.html">Quick Start</a></li> |
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| <li class="toctree-l1 current"><a class="current reference internal" href="#">Public Interface of Airflow</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="#using-airflow-public-interfaces">Using Airflow Public Interfaces</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="#using-the-public-interface-for-dag-authors">Using the Public Interface for DAG Authors</a><ul> |
| <li class="toctree-l3"><a class="reference internal" href="#dags">DAGs</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/example_dags/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.example_dags</span></code></a></li> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/models/dag/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.dag</span></code></a></li> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/models/dagbag/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.dagbag</span></code></a></li> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/models/param/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.param</span></code></a></li> |
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| <li class="toctree-l3"><a class="reference internal" href="#operators">Operators</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/operators/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.operators</span></code></a></li> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/sensors/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.sensors</span></code></a></li> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/models/baseoperator/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.baseoperator</span></code></a></li> |
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| <li class="toctree-l3"><a class="reference internal" href="#task-instances">Task Instances</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/models/taskinstance/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.taskinstance</span></code></a></li> |
| </ul> |
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| <li class="toctree-l3"><a class="reference internal" href="#task-instance-keys">Task Instance Keys</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/models/taskinstancekey/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.taskinstancekey</span></code></a></li> |
| </ul> |
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| <li class="toctree-l3"><a class="reference internal" href="#hooks">Hooks</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/hooks/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.hooks</span></code></a></li> |
| </ul> |
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| <li class="toctree-l3"><a class="reference internal" href="#public-airflow-utilities">Public Airflow utilities</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/models/connection/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.connection</span></code></a></li> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/models/variable/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.variable</span></code></a></li> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/models/xcom/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.xcom</span></code></a></li> |
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| <li class="toctree-l3"><a class="reference internal" href="#public-exceptions">Public Exceptions</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/exceptions/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.exceptions</span></code></a></li> |
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| <li class="toctree-l2"><a class="reference internal" href="#using-public-interface-to-extend-airflow-capabilities">Using Public Interface to extend Airflow capabilities</a><ul> |
| <li class="toctree-l3"><a class="reference internal" href="#triggers">Triggers</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/triggers/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.triggers</span></code></a></li> |
| </ul> |
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| <li class="toctree-l3"><a class="reference internal" href="#timetables">Timetables</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/timetables/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.timetables</span></code></a></li> |
| </ul> |
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| <li class="toctree-l3"><a class="reference internal" href="#listeners">Listeners</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="#extra-links">Extra Links</a></li> |
| </ul> |
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| <li class="toctree-l2"><a class="reference internal" href="#using-public-interface-to-integrate-with-external-services-and-applications">Using Public Interface to integrate with external services and applications</a><ul> |
| <li class="toctree-l3"><a class="reference internal" href="#executors">Executors</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="#secrets-backends">Secrets Backends</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/secrets/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.secrets</span></code></a></li> |
| </ul> |
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| <li class="toctree-l3"><a class="reference internal" href="#authentication-backends">Authentication Backends</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="#connections">Connections</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="#id1">Extra Links</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="#logging-and-monitoring">Logging and Monitoring</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="#decorators">Decorators</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/decorators/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.decorators</span></code></a></li> |
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| <li class="toctree-l3"><a class="reference internal" href="#lineage">Lineage</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l2"><a class="reference internal" href="#what-is-not-part-of-the-public-interface-of-apache-airflow">What is not part of the Public Interface of Apache Airflow?</a></li> |
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| <li class="toctree-l1"><a class="reference internal" href="index.html">Overview</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="start.html">Quick Start</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="installation/index.html">Installation of Airflow™</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="security/index.html">Security</a></li> |
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| <li class="toctree-l1"><a class="reference internal" href="administration-and-deployment/index.html">Administration and Deployment</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="integration.html">Integration</a></li> |
| <li class="toctree-l1 current"><a class="current reference internal" href="#">Public Interface of Airflow</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="#using-airflow-public-interfaces">Using Airflow Public Interfaces</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="#using-the-public-interface-for-dag-authors">Using the Public Interface for DAG Authors</a><ul> |
| <li class="toctree-l3"><a class="reference internal" href="#dags">DAGs</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/example_dags/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.example_dags</span></code></a></li> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/models/dag/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.dag</span></code></a></li> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/models/dagbag/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.dagbag</span></code></a></li> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/models/param/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.param</span></code></a></li> |
| </ul> |
| </li> |
| <li class="toctree-l3"><a class="reference internal" href="#operators">Operators</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/operators/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.operators</span></code></a></li> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/sensors/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.sensors</span></code></a></li> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/models/baseoperator/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.baseoperator</span></code></a></li> |
| </ul> |
| </li> |
| <li class="toctree-l3"><a class="reference internal" href="#task-instances">Task Instances</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/models/taskinstance/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.taskinstance</span></code></a></li> |
| </ul> |
| </li> |
| <li class="toctree-l3"><a class="reference internal" href="#task-instance-keys">Task Instance Keys</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/models/taskinstancekey/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.taskinstancekey</span></code></a></li> |
| </ul> |
| </li> |
| <li class="toctree-l3"><a class="reference internal" href="#hooks">Hooks</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/hooks/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.hooks</span></code></a></li> |
| </ul> |
| </li> |
| <li class="toctree-l3"><a class="reference internal" href="#public-airflow-utilities">Public Airflow utilities</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/models/connection/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.connection</span></code></a></li> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/models/variable/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.variable</span></code></a></li> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/models/xcom/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.xcom</span></code></a></li> |
| </ul> |
| </li> |
| <li class="toctree-l3"><a class="reference internal" href="#public-exceptions">Public Exceptions</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/exceptions/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.exceptions</span></code></a></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| <li class="toctree-l2"><a class="reference internal" href="#using-public-interface-to-extend-airflow-capabilities">Using Public Interface to extend Airflow capabilities</a><ul> |
| <li class="toctree-l3"><a class="reference internal" href="#triggers">Triggers</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/triggers/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.triggers</span></code></a></li> |
| </ul> |
| </li> |
| <li class="toctree-l3"><a class="reference internal" href="#timetables">Timetables</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/timetables/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.timetables</span></code></a></li> |
| </ul> |
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| <li class="toctree-l3"><a class="reference internal" href="#extra-links">Extra Links</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l2"><a class="reference internal" href="#using-public-interface-to-integrate-with-external-services-and-applications">Using Public Interface to integrate with external services and applications</a><ul> |
| <li class="toctree-l3"><a class="reference internal" href="#executors">Executors</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="#secrets-backends">Secrets Backends</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/secrets/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.secrets</span></code></a></li> |
| </ul> |
| </li> |
| <li class="toctree-l3"><a class="reference internal" href="#authentication-backends">Authentication Backends</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="#connections">Connections</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="#id1">Extra Links</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="#logging-and-monitoring">Logging and Monitoring</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="#decorators">Decorators</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="_api/airflow/decorators/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.decorators</span></code></a></li> |
| </ul> |
| </li> |
| <li class="toctree-l3"><a class="reference internal" href="#email-notifications">Email notifications</a></li> |
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| <blockquote> |
| <div></div></blockquote> |
| <div class="section" id="public-interface-of-airflow"> |
| <h1>Public Interface of Airflow<a class="headerlink" href="#public-interface-of-airflow" title="Permalink to this heading">¶</a></h1> |
| <p>The Public Interface of Apache Airflow is a set of interfaces that allow developers to interact |
| with and access certain features of the Apache Airflow system. This includes operations such as |
| creating and managing DAGs (Directed Acyclic Graphs), managing tasks and their dependencies, |
| and extending Airflow capabilities by writing new executors, plugins, operators and providers. The |
| Public Interface can be useful for building custom tools and integrations with other systems, |
| and for automating certain aspects of the Airflow workflow.</p> |
| <div class="section" id="using-airflow-public-interfaces"> |
| <h2>Using Airflow Public Interfaces<a class="headerlink" href="#using-airflow-public-interfaces" title="Permalink to this heading">¶</a></h2> |
| <p>Using Airflow Public Interfaces is needed when you want to interact with Airflow programmatically:</p> |
| <ul class="simple"> |
| <li><p>When you are extending Airflow classes such as Operators and Hooks. This can be done by DAG authors to add missing functionality in their DAGs or by those who write reusable custom operators for other DAG authors.</p></li> |
| <li><p>When writing new <a class="reference internal" href="authoring-and-scheduling/plugins.html"><span class="doc">Plugins</span></a> that extend Airflow’s functionality beyond |
| DAG building blocks. Secrets, Timetables, Triggers, Listeners are all examples of such functionality. This |
| is usually done by users who manage Airflow instances.</p></li> |
| <li><p>Bundling custom Operators, Hooks, Plugins and releasing them together via |
| <a class="reference external" href="/docs/apache-airflow-providers/index.html" title="(in apache-airflow-providers vdevel)"><span class="xref std std-doc">provider packages</span></a> - this is usually done by those who intend to |
| provide a reusable set of functionality for external services or applications Airflow integrates with.</p></li> |
| </ul> |
| <p>All the ways above involve extending or using Airflow Python classes and functions. The classes |
| and functions mentioned below can be relied on to keep backwards-compatible signatures and behaviours within |
| MAJOR version of Airflow. On the other hand, classes and methods starting with <code class="docutils literal notranslate"><span class="pre">_</span></code> (also known |
| as protected Python methods) and <code class="docutils literal notranslate"><span class="pre">__</span></code> (also known as private Python methods) are not part of the Public |
| Airflow Interface and might change at any time.</p> |
| <p>You can also use Airflow’s Public Interface via the <a class="reference external" href="stable-rest-api-ref">Stable REST API</a> (based on the |
| OpenAPI specification). For specific needs you can also use the |
| <a class="reference external" href="cli-and-env-variables-ref.rst">Airflow Command Line Interface (CLI)</a> though it’s behaviour might change |
| in details (such as output format and available flags) so if you want to rely on those in programmatic |
| way, the Stable REST API is recommended.</p> |
| </div> |
| <div class="section" id="using-the-public-interface-for-dag-authors"> |
| <h2>Using the Public Interface for DAG Authors<a class="headerlink" href="#using-the-public-interface-for-dag-authors" title="Permalink to this heading">¶</a></h2> |
| <div class="section" id="dags"> |
| <h3>DAGs<a class="headerlink" href="#dags" title="Permalink to this heading">¶</a></h3> |
| <p>The DAG is Airflow’s core entity that represents a recurring workflow. You can create a DAG by |
| instantiating the <a class="reference internal" href="_api/airflow/models/dag/index.html#airflow.models.dag.DAG" title="airflow.models.dag.DAG"><code class="xref py py-class docutils literal notranslate"><span class="pre">DAG</span></code></a> class in your DAG file. You can also instantiate |
| them via :class::<cite>~airflow.models.dagbag.DagBag</cite> class that reads DAGs from a file or a folder. DAGs |
| can also have parameters specified via :class::<cite>~airflow.models.param.Param</cite> class.</p> |
| <p>Airflow has a set of example DAGs that you can use to learn how to write DAGs</p> |
| <div class="toctree-wrapper compound"> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="_api/airflow/example_dags/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.example_dags</span></code></a></li> |
| </ul> |
| </div> |
| <p>You can read more about DAGs in <a class="reference internal" href="core-concepts/dags.html"><span class="doc">DAGs</span></a>.</p> |
| <p id="pythonapi-operators">References for the modules used in DAGs are here:</p> |
| <div class="toctree-wrapper compound"> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="_api/airflow/models/dag/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.dag</span></code></a></li> |
| <li class="toctree-l1"><a class="reference internal" href="_api/airflow/models/dagbag/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.dagbag</span></code></a></li> |
| <li class="toctree-l1"><a class="reference internal" href="_api/airflow/models/param/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.param</span></code></a></li> |
| </ul> |
| </div> |
| </div> |
| <div class="section" id="operators"> |
| <h3>Operators<a class="headerlink" href="#operators" title="Permalink to this heading">¶</a></h3> |
| <p>Operators allow for generation of certain types of tasks that become nodes in |
| the DAG when instantiated.</p> |
| <p>There are 3 main types of operators:</p> |
| <ul class="simple"> |
| <li><p>Operators that performs an <strong>action</strong>, or tell another system to |
| perform an action</p></li> |
| <li><p><strong>Transfer</strong> operators move data from one system to another</p></li> |
| <li><p><strong>Sensors</strong> are a certain type of operator that will keep running until a |
| certain criterion is met. Examples include a specific file landing in HDFS or |
| S3, a partition appearing in Hive, or a specific time of the day. Sensors |
| are derived from <a class="reference internal" href="_api/airflow/sensors/base/index.html#airflow.sensors.base.BaseSensorOperator" title="airflow.sensors.base.BaseSensorOperator"><code class="xref py py-class docutils literal notranslate"><span class="pre">BaseSensorOperator</span></code></a> and run a poke |
| method at a specified <code class="xref py py-attr docutils literal notranslate"><span class="pre">poke_interval</span></code> until it |
| returns <code class="docutils literal notranslate"><span class="pre">True</span></code>.</p></li> |
| </ul> |
| <p>All operators are derived from <a class="reference internal" href="_api/airflow/models/baseoperator/index.html#airflow.models.baseoperator.BaseOperator" title="airflow.models.baseoperator.BaseOperator"><code class="xref py py-class docutils literal notranslate"><span class="pre">BaseOperator</span></code></a> and acquire much |
| functionality through inheritance. Since this is the core of the engine, |
| it’s worth taking the time to understand the parameters of <a class="reference internal" href="_api/airflow/models/baseoperator/index.html#airflow.models.baseoperator.BaseOperator" title="airflow.models.baseoperator.BaseOperator"><code class="xref py py-class docutils literal notranslate"><span class="pre">BaseOperator</span></code></a> |
| to understand the primitive features that can be leveraged in your DAGs.</p> |
| <p>Airflow has a set of Operators that are considered public. You are also free to extend their functionality |
| by extending them:</p> |
| <div class="toctree-wrapper compound"> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="_api/airflow/operators/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.operators</span></code></a></li> |
| <li class="toctree-l1"><a class="reference internal" href="_api/airflow/sensors/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.sensors</span></code></a></li> |
| </ul> |
| </div> |
| <p>You can read more about the operators in <a class="reference internal" href="core-concepts/operators.html"><span class="doc">Operators</span></a>, <a class="reference internal" href="core-concepts/sensors.html"><span class="doc">Sensors</span></a>. |
| Also you can learn how to write a custom operator in <a class="reference internal" href="howto/custom-operator.html"><span class="doc">Creating a custom Operator</span></a>.</p> |
| <p id="pythonapi-hooks">References for the modules used in for operators are here:</p> |
| <div class="toctree-wrapper compound"> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="_api/airflow/models/baseoperator/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.baseoperator</span></code></a></li> |
| </ul> |
| </div> |
| </div> |
| <div class="section" id="task-instances"> |
| <h3>Task Instances<a class="headerlink" href="#task-instances" title="Permalink to this heading">¶</a></h3> |
| <p>Task instances are the individual runs of a single task in a DAG (in a DAG Run). They are available in the context |
| passed to the execute method of the operators via the <a class="reference internal" href="_api/airflow/models/taskinstance/index.html#airflow.models.taskinstance.TaskInstance" title="airflow.models.taskinstance.TaskInstance"><code class="xref py py-class docutils literal notranslate"><span class="pre">TaskInstance</span></code></a> class.</p> |
| <div class="toctree-wrapper compound"> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="_api/airflow/models/taskinstance/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.taskinstance</span></code></a></li> |
| </ul> |
| </div> |
| </div> |
| <div class="section" id="task-instance-keys"> |
| <h3>Task Instance Keys<a class="headerlink" href="#task-instance-keys" title="Permalink to this heading">¶</a></h3> |
| <p>Task instance keys are unique identifiers of task instances in a DAG (in a DAG Run). A key is a tuple that consists of |
| <code class="docutils literal notranslate"><span class="pre">dag_id</span></code>, <code class="docutils literal notranslate"><span class="pre">task_id</span></code>, <code class="docutils literal notranslate"><span class="pre">run_id</span></code>, <code class="docutils literal notranslate"><span class="pre">try_number</span></code>, and <code class="docutils literal notranslate"><span class="pre">map_index</span></code>. The key of a task instance can be retrieved via |
| <a class="reference internal" href="_api/airflow/models/taskinstance/index.html#airflow.models.taskinstance.TaskInstance.key" title="airflow.models.taskinstance.TaskInstance.key"><code class="xref py py-meth docutils literal notranslate"><span class="pre">key()</span></code></a>.</p> |
| <div class="toctree-wrapper compound"> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="_api/airflow/models/taskinstancekey/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.taskinstancekey</span></code></a></li> |
| </ul> |
| </div> |
| </div> |
| <div class="section" id="hooks"> |
| <h3>Hooks<a class="headerlink" href="#hooks" title="Permalink to this heading">¶</a></h3> |
| <p>Hooks are interfaces to external platforms and databases, implementing a common |
| interface when possible and acting as building blocks for operators. All hooks |
| are derived from <a class="reference internal" href="_api/airflow/hooks/base/index.html#airflow.hooks.base.BaseHook" title="airflow.hooks.base.BaseHook"><code class="xref py py-class docutils literal notranslate"><span class="pre">BaseHook</span></code></a>.</p> |
| <p>Airflow has a set of Hooks that are considered public. You are free to extend their functionality |
| by extending them:</p> |
| <div class="toctree-wrapper compound"> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="_api/airflow/hooks/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.hooks</span></code></a></li> |
| </ul> |
| </div> |
| </div> |
| <div class="section" id="public-airflow-utilities"> |
| <h3>Public Airflow utilities<a class="headerlink" href="#public-airflow-utilities" title="Permalink to this heading">¶</a></h3> |
| <p>When writing or extending Hooks and Operators, DAG authors and developers can |
| use the following classes:</p> |
| <ul class="simple"> |
| <li><p>The <a class="reference internal" href="_api/airflow/models/connection/index.html#airflow.models.connection.Connection" title="airflow.models.connection.Connection"><code class="xref py py-class docutils literal notranslate"><span class="pre">Connection</span></code></a>, which provides access to external service credentials and configuration.</p></li> |
| <li><p>The <a class="reference internal" href="_api/airflow/models/variable/index.html#airflow.models.variable.Variable" title="airflow.models.variable.Variable"><code class="xref py py-class docutils literal notranslate"><span class="pre">Variable</span></code></a>, which provides access to Airflow configuration variables.</p></li> |
| <li><p>The <a class="reference internal" href="_api/airflow/models/xcom/index.html#airflow.models.xcom.XCom" title="airflow.models.xcom.XCom"><code class="xref py py-class docutils literal notranslate"><span class="pre">XCom</span></code></a> which are used to access to inter-task communication data.</p></li> |
| </ul> |
| <p>You can read more about the public Airflow utilities in <a class="reference internal" href="howto/connection.html"><span class="doc">Managing Connections</span></a>, |
| <a class="reference internal" href="core-concepts/variables.html"><span class="doc">Variables</span></a>, <a class="reference internal" href="core-concepts/xcoms.html"><span class="doc">XComs</span></a></p> |
| <p>Reference for classes used for the utilities are here:</p> |
| <div class="toctree-wrapper compound"> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="_api/airflow/models/connection/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.connection</span></code></a></li> |
| <li class="toctree-l1"><a class="reference internal" href="_api/airflow/models/variable/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.variable</span></code></a></li> |
| <li class="toctree-l1"><a class="reference internal" href="_api/airflow/models/xcom/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.models.xcom</span></code></a></li> |
| </ul> |
| </div> |
| </div> |
| <div class="section" id="public-exceptions"> |
| <h3>Public Exceptions<a class="headerlink" href="#public-exceptions" title="Permalink to this heading">¶</a></h3> |
| <p>When writing the custom Operators and Hooks, you can handle and raise public Exceptions that Airflow |
| exposes:</p> |
| <div class="toctree-wrapper compound"> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="_api/airflow/exceptions/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.exceptions</span></code></a></li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="section" id="using-public-interface-to-extend-airflow-capabilities"> |
| <h2>Using Public Interface to extend Airflow capabilities<a class="headerlink" href="#using-public-interface-to-extend-airflow-capabilities" title="Permalink to this heading">¶</a></h2> |
| <p>Airflow uses Plugin mechanism to extend Airflow platform capabilities. They allow to extend |
| Airflow UI but also they are the way to expose the below customizations (Triggers, Timetables, Listeners, etc.). |
| Providers can also implement plugin endpoints and customize Airflow UI and the customizations.</p> |
| <p>You can read more about plugins in <a class="reference internal" href="authoring-and-scheduling/plugins.html"><span class="doc">Plugins</span></a>. You can read how to extend |
| Airflow UI in <a class="reference internal" href="howto/custom-view-plugin.html"><span class="doc">Customize view of Apache from Airflow web UI</span></a>. Note that there are some simple customizations of the UI |
| that do not require plugins - you can read more about them in <a class="reference internal" href="howto/customize-ui.html"><span class="doc">Customizing the UI</span></a>.</p> |
| <p>Here are the ways how Plugins can be used to extend Airflow:</p> |
| <div class="section" id="triggers"> |
| <h3>Triggers<a class="headerlink" href="#triggers" title="Permalink to this heading">¶</a></h3> |
| <p>Airflow uses Triggers to implement <code class="docutils literal notranslate"><span class="pre">asyncio</span></code> compatible Deferrable Operators. |
| All Triggers derive from <a class="reference internal" href="_api/airflow/triggers/base/index.html#airflow.triggers.base.BaseTrigger" title="airflow.triggers.base.BaseTrigger"><code class="xref py py-class docutils literal notranslate"><span class="pre">BaseTrigger</span></code></a>.</p> |
| <p>Airflow has a set of Triggers that are considered public. You are free to extend their functionality |
| by extending them:</p> |
| <div class="toctree-wrapper compound"> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="_api/airflow/triggers/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.triggers</span></code></a></li> |
| </ul> |
| </div> |
| <p>You can read more about Triggers in <a class="reference internal" href="authoring-and-scheduling/deferring.html"><span class="doc">Deferrable Operators & Triggers</span></a>.</p> |
| </div> |
| <div class="section" id="timetables"> |
| <h3>Timetables<a class="headerlink" href="#timetables" title="Permalink to this heading">¶</a></h3> |
| <p>Custom timetable implementations provide Airflow’s scheduler additional logic to |
| schedule DAG runs in ways not possible with built-in schedule expressions. |
| All Timetables derive from <a class="reference internal" href="_api/airflow/timetables/base/index.html#airflow.timetables.base.Timetable" title="airflow.timetables.base.Timetable"><code class="xref py py-class docutils literal notranslate"><span class="pre">Timetable</span></code></a>.</p> |
| <p>Airflow has a set of Timetables that are considered public. You are free to extend their functionality |
| by extending them:</p> |
| <div class="toctree-wrapper compound"> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="_api/airflow/timetables/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.timetables</span></code></a></li> |
| </ul> |
| </div> |
| <p>You can read more about Timetables in <a class="reference internal" href="howto/timetable.html"><span class="doc">Customizing DAG Scheduling with Timetables</span></a>.</p> |
| </div> |
| <div class="section" id="listeners"> |
| <h3>Listeners<a class="headerlink" href="#listeners" title="Permalink to this heading">¶</a></h3> |
| <p>Listeners enable you to respond to DAG/Task lifecycle events.</p> |
| <p>This is implemented via <code class="xref py py-class docutils literal notranslate"><span class="pre">ListenerManager</span></code> class that provides hooks that |
| can be implemented to respond to DAG/Task lifecycle events.</p> |
| <div class="versionadded"> |
| <p><span class="versionmodified added">New in version 2.5: </span>Listener public interface has been added in version 2.5.</p> |
| </div> |
| <p>You can read more about Listeners in <a class="reference internal" href="administration-and-deployment/listeners.html"><span class="doc">Listeners</span></a>.</p> |
| </div> |
| <div class="section" id="extra-links"> |
| <h3>Extra Links<a class="headerlink" href="#extra-links" title="Permalink to this heading">¶</a></h3> |
| <p>Extra links are dynamic links that could be added to Airflow independently from custom Operators. Normally |
| they can be defined by the Operators, but plugins allow you to override the links on a global level.</p> |
| <p>You can read more about the Extra Links in <a class="reference internal" href="howto/define-extra-link.html"><span class="doc">Define an operator extra link</span></a>.</p> |
| </div> |
| </div> |
| <div class="section" id="using-public-interface-to-integrate-with-external-services-and-applications"> |
| <h2>Using Public Interface to integrate with external services and applications<a class="headerlink" href="#using-public-interface-to-integrate-with-external-services-and-applications" title="Permalink to this heading">¶</a></h2> |
| <p>Tasks in Airflow can orchestrate external services via Hooks and Operators. The core functionality of |
| Airflow (such as authentication) can also be extended to leverage external services. |
| You can read more about providers <a class="reference external" href="/docs/apache-airflow-providers/index.html" title="(in apache-airflow-providers vdevel)"><span class="xref std std-doc">provider packages</span></a> and core |
| extensions they can provide in <a class="reference external" href="/docs/apache-airflow-providers/core-extensions/index.html" title="(in apache-airflow-providers vdevel)"><span class="xref std std-doc">provider packages</span></a>.</p> |
| <div class="section" id="executors"> |
| <h3>Executors<a class="headerlink" href="#executors" title="Permalink to this heading">¶</a></h3> |
| <p>Executors are the mechanism by which task instances get run. All executors are |
| derived from <code class="xref py py-class docutils literal notranslate"><span class="pre">BaseExecutor</span></code>. There are several |
| executor implementations built-in Airflow, each with its own unique characteristics and capabilities.</p> |
| <p>The executor interface itself (the BaseExecutor class) is public, but the built-in executors are not (i.e. KubernetesExecutor, LocalExecutor, etc). This means that, to use KubernetesExecutor as an example, we may make changes to KubernetesExecutor in minor or patch Airflow releases which could break an executor that subclasses KubernetesExecutor. This is necessary to allow Airflow developers sufficient freedom to continue to improve the executors we offer. Accordingly if you want to modify or extend a built-in executor, you should incorporate the full executor code into your project so that such changes will not break your derivative executor.</p> |
| <p>You can read more about executors in <a class="reference internal" href="core-concepts/executor/index.html"><span class="doc">Executor</span></a>.</p> |
| <div class="versionadded"> |
| <p><span class="versionmodified added">New in version 2.6: </span>The executor interface has been present in Airflow for quite some time but prior to 2.6, there was executor-specific |
| code elsewhere in the codebase. As of version 2.6 executors are fully decoupled, in the sense that Airflow core no |
| longer needs to know about the behavior of specific executors. |
| You could have succeeded with implementing a custom executor before Airflow 2.6, and a number |
| of people did, but there were some hard-coded behaviours that preferred in-built |
| executors, and custom executors could not provide full functionality that built-in executors had.</p> |
| </div> |
| </div> |
| <div class="section" id="secrets-backends"> |
| <h3>Secrets Backends<a class="headerlink" href="#secrets-backends" title="Permalink to this heading">¶</a></h3> |
| <p>Airflow can be configured to rely on secrets backends to retrieve |
| <a class="reference internal" href="_api/airflow/models/connection/index.html#airflow.models.connection.Connection" title="airflow.models.connection.Connection"><code class="xref py py-class docutils literal notranslate"><span class="pre">Connection</span></code></a> and <code class="xref py py-class docutils literal notranslate"><span class="pre">Variables</span></code>. |
| All secrets backends derive from <code class="xref py py-class docutils literal notranslate"><span class="pre">BaseSecretsBackend</span></code>.</p> |
| <p>All Secrets Backend implementations are public. You can extend their functionality:</p> |
| <div class="toctree-wrapper compound"> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="_api/airflow/secrets/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.secrets</span></code></a></li> |
| </ul> |
| </div> |
| <p>You can read more about Secret Backends in <a class="reference internal" href="security/secrets/secrets-backend/index.html"><span class="doc">Secrets Backend</span></a>. |
| You can also find all the available Secrets Backends implemented in community providers |
| in <a class="reference external" href="/docs/apache-airflow-providers/core-extensions/secrets-backends.html" title="(in apache-airflow-providers vdevel)"><span>Secret backends</span></a>.</p> |
| </div> |
| <div class="section" id="authentication-backends"> |
| <h3>Authentication Backends<a class="headerlink" href="#authentication-backends" title="Permalink to this heading">¶</a></h3> |
| <p>Authentication backends can extend the way how Airflow authentication mechanism works. You can find out more |
| about authentication in <a class="reference external" href="/docs/apache-airflow-providers/core-extensions/auth-backends.html" title="(in apache-airflow-providers vdevel)"><span>Auth backends</span></a> that also shows available |
| Authentication backends implemented in the community providers.</p> |
| </div> |
| <div class="section" id="connections"> |
| <h3>Connections<a class="headerlink" href="#connections" title="Permalink to this heading">¶</a></h3> |
| <p>When creating Hooks, you can add custom Connections. You can read more |
| about connections in <a class="reference external" href="/docs/apache-airflow-providers/core-extensions/connections.html" title="(in apache-airflow-providers vdevel)"><span>Connections</span></a> for available |
| Connections implemented in the community providers.</p> |
| </div> |
| <div class="section" id="id1"> |
| <h3>Extra Links<a class="headerlink" href="#id1" title="Permalink to this heading">¶</a></h3> |
| <p>When creating Hooks, you can add custom Extra Links that are displayed when the tasks are run. |
| You can find out more about extra links in <a class="reference external" href="/docs/apache-airflow-providers/core-extensions/extra-links.html" title="(in apache-airflow-providers vdevel)"><span>Extra Links</span></a> |
| that also shows available extra links implemented in the community providers.</p> |
| </div> |
| <div class="section" id="logging-and-monitoring"> |
| <h3>Logging and Monitoring<a class="headerlink" href="#logging-and-monitoring" title="Permalink to this heading">¶</a></h3> |
| <p>You can extend the way how logs are written by Airflow. You can find out more about log writing in |
| <a class="reference internal" href="administration-and-deployment/logging-monitoring/index.html"><span class="doc">Logging & Monitoring</span></a>.</p> |
| <p>The <a class="reference external" href="/docs/apache-airflow-providers/core-extensions/logging.html" title="(in apache-airflow-providers vdevel)"><span>Writing logs</span></a> that also shows available log writers |
| implemented in the community providers.</p> |
| </div> |
| <div class="section" id="decorators"> |
| <h3>Decorators<a class="headerlink" href="#decorators" title="Permalink to this heading">¶</a></h3> |
| <p>DAG authors can use decorators to author DAGs using the <a class="reference internal" href="core-concepts/taskflow.html"><span class="doc">TaskFlow</span></a> concept. |
| All Decorators derive from <a class="reference internal" href="_api/airflow/decorators/base/index.html#airflow.decorators.base.TaskDecorator" title="airflow.decorators.base.TaskDecorator"><code class="xref py py-class docutils literal notranslate"><span class="pre">TaskDecorator</span></code></a>.</p> |
| <p>Airflow has a set of Decorators that are considered public. You are free to extend their functionality |
| by extending them:</p> |
| <div class="toctree-wrapper compound"> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="_api/airflow/decorators/index.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.decorators</span></code></a></li> |
| </ul> |
| </div> |
| <p>You can read more about creating custom Decorators in <a class="reference internal" href="howto/create-custom-decorator.html"><span class="doc">Creating Custom @task Decorators</span></a>.</p> |
| </div> |
| <div class="section" id="email-notifications"> |
| <h3>Email notifications<a class="headerlink" href="#email-notifications" title="Permalink to this heading">¶</a></h3> |
| <p>Airflow has a built-in way of sending email notifications and it allows to extend it by adding custom |
| email notification classes. You can read more about email notifications in <a class="reference internal" href="howto/email-config.html"><span class="doc">Email Configuration</span></a>.</p> |
| </div> |
| <div class="section" id="notifications"> |
| <h3>Notifications<a class="headerlink" href="#notifications" title="Permalink to this heading">¶</a></h3> |
| <p>Airflow has a built-in extensible way of sending notifications using the various <code class="docutils literal notranslate"><span class="pre">on_*_callback</span></code>. You can read more |
| about notifications in <a class="reference internal" href="howto/notifications.html"><span class="doc">Creating a notifier</span></a>.</p> |
| </div> |
| <div class="section" id="cluster-policies"> |
| <h3>Cluster Policies<a class="headerlink" href="#cluster-policies" title="Permalink to this heading">¶</a></h3> |
| <p>Cluster Policies are the way to dynamically apply cluster-wide policies to the DAGs being parsed or tasks |
| being executed. You can read more about Cluster Policies in <a class="reference internal" href="administration-and-deployment/cluster-policies.html"><span class="doc">Cluster Policies</span></a>.</p> |
| </div> |
| <div class="section" id="lineage"> |
| <h3>Lineage<a class="headerlink" href="#lineage" title="Permalink to this heading">¶</a></h3> |
| <p>Airflow can help track origins of data, what happens to it and where it moves over time. You can read more |
| about lineage in <a class="reference internal" href="administration-and-deployment/lineage.html"><span class="doc">Lineage</span></a>.</p> |
| </div> |
| </div> |
| <div class="section" id="what-is-not-part-of-the-public-interface-of-apache-airflow"> |
| <h2>What is not part of the Public Interface of Apache Airflow?<a class="headerlink" href="#what-is-not-part-of-the-public-interface-of-apache-airflow" title="Permalink to this heading">¶</a></h2> |
| <p>Everything not mentioned in this document should be considered as non-Public Interface.</p> |
| <p>Sometimes in other applications those components could be relied on to keep backwards compatibility, |
| but in Airflow they are not parts of the Public Interface and might change any time:</p> |
| <ul class="simple"> |
| <li><p><a class="reference external" href="database-erd-ref">Database structure</a> is considered to be an internal implementation |
| detail and you should not assume the structure is going to be maintained in a |
| backwards-compatible way.</p></li> |
| <li><p><a class="reference external" href="ui">Web UI</a> is continuously evolving and there are no backwards compatibility guarantees on HTML elements.</p></li> |
| <li><p>Python classes except those explicitly mentioned in this document, are considered an |
| internal implementation detail and you should not assume they will be maintained |
| in a backwards-compatible way.</p></li> |
| </ul> |
| </div> |
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| <li><a class="reference internal" href="#using-airflow-public-interfaces">Using Airflow Public Interfaces</a></li> |
| <li><a class="reference internal" href="#using-the-public-interface-for-dag-authors">Using the Public Interface for DAG Authors</a><ul> |
| <li><a class="reference internal" href="#dags">DAGs</a><ul> |
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| <li><a class="reference internal" href="#extra-links">Extra Links</a></li> |
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| <li><a class="reference internal" href="#using-public-interface-to-integrate-with-external-services-and-applications">Using Public Interface to integrate with external services and applications</a><ul> |
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| <li><a class="reference internal" href="#secrets-backends">Secrets Backends</a></li> |
| <li><a class="reference internal" href="#authentication-backends">Authentication Backends</a></li> |
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