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| <div class="section" id="scaling-out-with-dask"> |
| <h1>Scaling Out with Dask<a class="headerlink" href="#scaling-out-with-dask" title="Permalink to this headline">ΒΆ</a></h1> |
| <p><code class="docutils literal notranslate"><span class="pre">DaskExecutor</span></code> allows you to run Airflow tasks in a Dask Distributed cluster.</p> |
| <p>Dask clusters can be run on a single machine or on remote networks. For complete |
| details, consult the <a class="reference external" href="https://distributed.readthedocs.io/">Distributed documentation</a>.</p> |
| <p>To create a cluster, first start a Scheduler:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="c1"># default settings for a local cluster</span> |
| <span class="nv">DASK_HOST</span><span class="o">=</span><span class="m">127</span>.0.0.1 |
| <span class="nv">DASK_PORT</span><span class="o">=</span><span class="m">8786</span> |
| |
| dask-scheduler --host <span class="nv">$DASK_HOST</span> --port <span class="nv">$DASK_PORT</span> |
| </pre></div> |
| </div> |
| <p>Next start at least one Worker on any machine that can connect to the host:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>dask-worker <span class="nv">$DASK_HOST</span>:<span class="nv">$DASK_PORT</span> |
| </pre></div> |
| </div> |
| <p>Edit your <code class="docutils literal notranslate"><span class="pre">airflow.cfg</span></code> to set your executor to <code class="docutils literal notranslate"><span class="pre">DaskExecutor</span></code> and provide |
| the Dask Scheduler address in the <code class="docutils literal notranslate"><span class="pre">[dask]</span></code> section.</p> |
| <p>Please note:</p> |
| <ul class="simple"> |
| <li>Each Dask worker must be able to import Airflow and any dependencies you |
| require.</li> |
| <li>Dask does not support queues. If an Airflow task was created with a queue, a |
| warning will be raised but the task will be submitted to the cluster.</li> |
| </ul> |
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