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| <div class="section" id="module-airflow.executors.local_executor"> |
| <span id="airflow-executors-local-executor"></span><h1><a class="reference internal" href="#module-airflow.executors.local_executor" title="airflow.executors.local_executor"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.executors.local_executor</span></code></a><a class="headerlink" href="#module-airflow.executors.local_executor" title="Permalink to this headline">¶</a></h1> |
| <p><p>LocalExecutor runs tasks by spawning processes in a controlled fashion in different |
| modes. Given that BaseExecutor has the option to receive a <cite>parallelism</cite> parameter to |
| limit the number of process spawned, when this parameter is <cite>0</cite> the number of processes |
| that LocalExecutor can spawn is unlimited.</p> |
| <p>The following strategies are implemented: |
| 1. Unlimited Parallelism (self.parallelism == 0): In this strategy, LocalExecutor will |
| spawn a process every time <cite>execute_async</cite> is called, that is, every task submitted to the |
| LocalExecutor will be executed in its own process. Once the task is executed and the |
| result stored in the <cite>result_queue</cite>, the process terminates. There is no need for a |
| <cite>task_queue</cite> in this approach, since as soon as a task is received a new process will be |
| allocated to the task. Processes used in this strategy are of class LocalWorker.</p> |
| <p>2. Limited Parallelism (self.parallelism > 0): In this strategy, the LocalExecutor spawns |
| the number of processes equal to the value of <cite>self.parallelism</cite> at <cite>start</cite> time, |
| using a <cite>task_queue</cite> to coordinate the ingestion of tasks and the work distribution among |
| the workers, which will take a task as soon as they are ready. During the lifecycle of |
| the LocalExecutor, the worker processes are running waiting for tasks, once the |
| LocalExecutor receives the call to shutdown the executor a poison token is sent to the |
| workers to terminate them. Processes used in this strategy are of class QueuedLocalWorker.</p> |
| <p>Arguably, <cite>SequentialExecutor</cite> could be thought as a LocalExecutor with limited |
| parallelism of just 1 worker, i.e. <cite>self.parallelism = 1</cite>. |
| This option could lead to the unification of the executor implementations, running |
| locally, into just one <cite>LocalExecutor</cite> with multiple modes.</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="class"> |
| <dt id="airflow.executors.local_executor.LocalWorker"> |
| <em class="property">class </em><code class="sig-prename descclassname">airflow.executors.local_executor.</code><code class="sig-name descname">LocalWorker</code><span class="sig-paren">(</span><em class="sig-param">result_queue</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/executors/local_executor.html#LocalWorker"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.executors.local_executor.LocalWorker" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/multiprocessing.html#multiprocessing.Process" title="(in Python v3.8)"><code class="xref py py-class docutils literal notranslate"><span class="pre">multiprocessing.Process</span></code></a>, <code class="xref py py-class docutils literal notranslate"><span class="pre">airflow.utils.log.logging_mixin.LoggingMixin</span></code></p> |
| <p>LocalWorker Process implementation to run airflow commands. Executes the given |
| command and puts the result into a result queue when done, terminating execution.</p> |
| <dl class="method"> |
| <dt id="airflow.executors.local_executor.LocalWorker.execute_work"> |
| <code class="sig-name descname">execute_work</code><span class="sig-paren">(</span><em class="sig-param">self</em>, <em class="sig-param">key</em>, <em class="sig-param">command</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/executors/local_executor.html#LocalWorker.execute_work"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.executors.local_executor.LocalWorker.execute_work" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Executes command received and stores result state in queue. |
| :param key: the key to identify the TI |
| :type key: tuple(dag_id, task_id, execution_date) |
| :param command: the command to execute |
| :type command: str</p> |
| </dd></dl> |
| |
| <dl class="method"> |
| <dt id="airflow.executors.local_executor.LocalWorker.run"> |
| <code class="sig-name descname">run</code><span class="sig-paren">(</span><em class="sig-param">self</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/executors/local_executor.html#LocalWorker.run"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.executors.local_executor.LocalWorker.run" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| </dd></dl> |
| |
| <dl class="class"> |
| <dt id="airflow.executors.local_executor.QueuedLocalWorker"> |
| <em class="property">class </em><code class="sig-prename descclassname">airflow.executors.local_executor.</code><code class="sig-name descname">QueuedLocalWorker</code><span class="sig-paren">(</span><em class="sig-param">task_queue</em>, <em class="sig-param">result_queue</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/executors/local_executor.html#QueuedLocalWorker"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.executors.local_executor.QueuedLocalWorker" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference internal" href="#airflow.executors.local_executor.LocalWorker" title="airflow.executors.local_executor.LocalWorker"><code class="xref py py-class docutils literal notranslate"><span class="pre">airflow.executors.local_executor.LocalWorker</span></code></a></p> |
| <p>LocalWorker implementation that is waiting for tasks from a queue and will |
| continue executing commands as they become available in the queue. It will terminate |
| execution once the poison token is found.</p> |
| <dl class="method"> |
| <dt id="airflow.executors.local_executor.QueuedLocalWorker.run"> |
| <code class="sig-name descname">run</code><span class="sig-paren">(</span><em class="sig-param">self</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/executors/local_executor.html#QueuedLocalWorker.run"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.executors.local_executor.QueuedLocalWorker.run" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| </dd></dl> |
| |
| <dl class="class"> |
| <dt id="airflow.executors.local_executor.LocalExecutor"> |
| <em class="property">class </em><code class="sig-prename descclassname">airflow.executors.local_executor.</code><code class="sig-name descname">LocalExecutor</code><a class="reference internal" href="../../../../_modules/airflow/executors/local_executor.html#LocalExecutor"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.executors.local_executor.LocalExecutor" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference internal" href="../base_executor/index.html#airflow.executors.base_executor.BaseExecutor" title="airflow.executors.base_executor.BaseExecutor"><code class="xref py py-class docutils literal notranslate"><span class="pre">airflow.executors.base_executor.BaseExecutor</span></code></a></p> |
| <p>LocalExecutor executes tasks locally in parallel. It uses the |
| multiprocessing Python library and queues to parallelize the execution |
| of tasks.</p> |
| <dl class="class"> |
| <dt id="airflow.executors.local_executor.LocalExecutor._UnlimitedParallelism"> |
| <em class="property">class </em><code class="sig-name descname">_UnlimitedParallelism</code><span class="sig-paren">(</span><em class="sig-param">executor</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/executors/local_executor.html#LocalExecutor._UnlimitedParallelism"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.executors.local_executor.LocalExecutor._UnlimitedParallelism" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/functions.html#object" title="(in Python v3.8)"><code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></a></p> |
| <p>Implements LocalExecutor with unlimited parallelism, starting one process |
| per each command to execute.</p> |
| <dl class="method"> |
| <dt id="airflow.executors.local_executor.LocalExecutor._UnlimitedParallelism.start"> |
| <code class="sig-name descname">start</code><span class="sig-paren">(</span><em class="sig-param">self</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/executors/local_executor.html#LocalExecutor._UnlimitedParallelism.start"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.executors.local_executor.LocalExecutor._UnlimitedParallelism.start" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="airflow.executors.local_executor.LocalExecutor._UnlimitedParallelism.execute_async"> |
| <code class="sig-name descname">execute_async</code><span class="sig-paren">(</span><em class="sig-param">self</em>, <em class="sig-param">key</em>, <em class="sig-param">command</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/executors/local_executor.html#LocalExecutor._UnlimitedParallelism.execute_async"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.executors.local_executor.LocalExecutor._UnlimitedParallelism.execute_async" title="Permalink to this definition">¶</a></dt> |
| <dd><dl class="field-list simple"> |
| <dt class="field-odd">Parameters</dt> |
| <dd class="field-odd"><ul class="simple"> |
| <li><p><strong>key</strong> (<a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#tuple" title="(in Python v3.8)"><em>tuple</em></a><em>(</em><em>dag_id</em><em>, </em><em>task_id</em><em>, </em><em>execution_date</em><em>)</em>) – the key to identify the TI</p></li> |
| <li><p><strong>command</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 command to execute</p></li> |
| </ul> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| <dl class="method"> |
| <dt id="airflow.executors.local_executor.LocalExecutor._UnlimitedParallelism.sync"> |
| <code class="sig-name descname">sync</code><span class="sig-paren">(</span><em class="sig-param">self</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/executors/local_executor.html#LocalExecutor._UnlimitedParallelism.sync"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.executors.local_executor.LocalExecutor._UnlimitedParallelism.sync" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="airflow.executors.local_executor.LocalExecutor._UnlimitedParallelism.end"> |
| <code class="sig-name descname">end</code><span class="sig-paren">(</span><em class="sig-param">self</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/executors/local_executor.html#LocalExecutor._UnlimitedParallelism.end"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.executors.local_executor.LocalExecutor._UnlimitedParallelism.end" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| </dd></dl> |
| |
| <dl class="class"> |
| <dt id="airflow.executors.local_executor.LocalExecutor._LimitedParallelism"> |
| <em class="property">class </em><code class="sig-name descname">_LimitedParallelism</code><span class="sig-paren">(</span><em class="sig-param">executor</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/executors/local_executor.html#LocalExecutor._LimitedParallelism"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.executors.local_executor.LocalExecutor._LimitedParallelism" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/functions.html#object" title="(in Python v3.8)"><code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></a></p> |
| <p>Implements LocalExecutor with limited parallelism using a task queue to |
| coordinate work distribution.</p> |
| <dl class="method"> |
| <dt id="airflow.executors.local_executor.LocalExecutor._LimitedParallelism.start"> |
| <code class="sig-name descname">start</code><span class="sig-paren">(</span><em class="sig-param">self</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/executors/local_executor.html#LocalExecutor._LimitedParallelism.start"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.executors.local_executor.LocalExecutor._LimitedParallelism.start" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="airflow.executors.local_executor.LocalExecutor._LimitedParallelism.execute_async"> |
| <code class="sig-name descname">execute_async</code><span class="sig-paren">(</span><em class="sig-param">self</em>, <em class="sig-param">key</em>, <em class="sig-param">command</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/executors/local_executor.html#LocalExecutor._LimitedParallelism.execute_async"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.executors.local_executor.LocalExecutor._LimitedParallelism.execute_async" title="Permalink to this definition">¶</a></dt> |
| <dd><dl class="field-list simple"> |
| <dt class="field-odd">Parameters</dt> |
| <dd class="field-odd"><ul class="simple"> |
| <li><p><strong>key</strong> (<a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#tuple" title="(in Python v3.8)"><em>tuple</em></a><em>(</em><em>dag_id</em><em>, </em><em>task_id</em><em>, </em><em>execution_date</em><em>)</em>) – the key to identify the TI</p></li> |
| <li><p><strong>command</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 command to execute</p></li> |
| </ul> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| <dl class="method"> |
| <dt id="airflow.executors.local_executor.LocalExecutor._LimitedParallelism.sync"> |
| <code class="sig-name descname">sync</code><span class="sig-paren">(</span><em class="sig-param">self</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/executors/local_executor.html#LocalExecutor._LimitedParallelism.sync"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.executors.local_executor.LocalExecutor._LimitedParallelism.sync" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="airflow.executors.local_executor.LocalExecutor._LimitedParallelism.end"> |
| <code class="sig-name descname">end</code><span class="sig-paren">(</span><em class="sig-param">self</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/executors/local_executor.html#LocalExecutor._LimitedParallelism.end"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.executors.local_executor.LocalExecutor._LimitedParallelism.end" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| </dd></dl> |
| |
| <dl class="method"> |
| <dt id="airflow.executors.local_executor.LocalExecutor.start"> |
| <code class="sig-name descname">start</code><span class="sig-paren">(</span><em class="sig-param">self</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/executors/local_executor.html#LocalExecutor.start"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.executors.local_executor.LocalExecutor.start" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="airflow.executors.local_executor.LocalExecutor.execute_async"> |
| <code class="sig-name descname">execute_async</code><span class="sig-paren">(</span><em class="sig-param">self</em>, <em class="sig-param">key</em>, <em class="sig-param">command</em>, <em class="sig-param">queue=None</em>, <em class="sig-param">executor_config=None</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/executors/local_executor.html#LocalExecutor.execute_async"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.executors.local_executor.LocalExecutor.execute_async" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="airflow.executors.local_executor.LocalExecutor.sync"> |
| <code class="sig-name descname">sync</code><span class="sig-paren">(</span><em class="sig-param">self</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/executors/local_executor.html#LocalExecutor.sync"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.executors.local_executor.LocalExecutor.sync" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="airflow.executors.local_executor.LocalExecutor.end"> |
| <code class="sig-name descname">end</code><span class="sig-paren">(</span><em class="sig-param">self</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../_modules/airflow/executors/local_executor.html#LocalExecutor.end"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.executors.local_executor.LocalExecutor.end" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| </dd></dl> |
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