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<blockquote>
<div></div></blockquote>
<div class="section" id="scheduler">
<h1>Scheduler<a class="headerlink" href="#scheduler" title="Permalink to this headline"></a></h1>
<p>The Airflow scheduler monitors all tasks and DAGs, then triggers the
task instances once their dependencies are complete. Behind the scenes,
the scheduler spins up a subprocess, which monitors and stays in sync with all
DAGs in the specified DAG directory. Once per minute, by default, the scheduler
collects DAG parsing results and checks whether any active tasks can be triggered.</p>
<p>The Airflow scheduler is designed to run as a persistent service in an
Airflow production environment. To kick it off, all you need to do is
execute the <code class="docutils literal notranslate"><span class="pre">airflow</span> <span class="pre">scheduler</span></code> command. It uses the configuration specified in
<code class="docutils literal notranslate"><span class="pre">airflow.cfg</span></code>.</p>
<p>The scheduler uses the configured <a class="reference internal" href="executor/index.html"><span class="doc">Executor</span></a> to run tasks that are ready.</p>
<p>To start a scheduler, simply run the command:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>airflow scheduler
</pre></div>
</div>
<p>Your DAGs will start executing once the scheduler is running successfully.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The first DAG Run is created based on the minimum <code class="docutils literal notranslate"><span class="pre">start_date</span></code> for the tasks in your DAG.
Subsequent DAG Runs are created by the scheduler process, based on your DAG’s <code class="docutils literal notranslate"><span class="pre">schedule_interval</span></code>,
sequentially.</p>
</div>
<p>The scheduler won't trigger your tasks until the period it covers has ended e.g., A job with <code class="docutils literal notranslate"><span class="pre">schedule_interval</span></code> set as <code class="docutils literal notranslate"><span class="pre">&#64;daily</span></code> runs after the day
has ended. This technique makes sure that whatever data is required for that period is fully available before the dag is executed.
In the UI, it appears as if Airflow is running your tasks a day <strong>late</strong></p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>If you run a DAG on a <code class="docutils literal notranslate"><span class="pre">schedule_interval</span></code> of one day, the run with <code class="docutils literal notranslate"><span class="pre">execution_date</span></code> <code class="docutils literal notranslate"><span class="pre">2019-11-21</span></code> triggers soon after <code class="docutils literal notranslate"><span class="pre">2019-11-21T23:59</span></code>.</p>
<p><strong>Let’s Repeat That</strong>, the scheduler runs your job one <code class="docutils literal notranslate"><span class="pre">schedule_interval</span></code> AFTER the start date, at the END of the period.</p>
<p>You should refer to <a class="reference internal" href="dag-run.html"><span class="doc">DAG Runs</span></a> for details on scheduling a DAG.</p>
</div>
<div class="section" id="triggering-dag-with-future-date">
<h2>Triggering DAG with Future Date<a class="headerlink" href="#triggering-dag-with-future-date" title="Permalink to this headline"></a></h2>
<p>If you want to use 'external trigger' to run future-dated execution dates, set <code class="docutils literal notranslate"><span class="pre">allow_trigger_in_future</span> <span class="pre">=</span> <span class="pre">True</span></code> in <code class="docutils literal notranslate"><span class="pre">scheduler</span></code> section in <code class="docutils literal notranslate"><span class="pre">airflow.cfg</span></code>.
This only has effect if your DAG has no <code class="docutils literal notranslate"><span class="pre">schedule_interval</span></code>.
If you keep default <code class="docutils literal notranslate"><span class="pre">allow_trigger_in_future</span> <span class="pre">=</span> <span class="pre">False</span></code> and try 'external trigger' to run future-dated execution dates,
the scheduler won't execute it now but the scheduler will execute it in the future once the current date rolls over to the execution date.</p>
</div>
<div class="section" id="running-more-than-one-scheduler">
<h2>Running More Than One Scheduler<a class="headerlink" href="#running-more-than-one-scheduler" title="Permalink to this headline"></a></h2>
<p>Airflow supports running more than one scheduler concurrently -- both for performance reasons and for
resiliency.</p>
<div class="section" id="overview">
<h3>Overview<a class="headerlink" href="#overview" title="Permalink to this headline"></a></h3>
<p>The <abbr title="highly available">HA</abbr> scheduler is designed to take advantage of the existing metadata database.
This was primarily done for operational simplicity: every component already has to speak to this DB, and by
not using direct communication or consensus algorithm between schedulers (Raft, Paxos, etc.) nor another
consensus tool (Apache Zookeeper, or Consul for instance) we have kept the &quot;operational surface area&quot; to a
minimum.</p>
<p>The scheduler now uses the serialized DAG representation to make its scheduling decisions and the rough
outline of the scheduling loop is:</p>
<ul class="simple">
<li><p>Check for any DAGs needing a new DagRun, and create them</p></li>
<li><p>Examine a batch of DagRuns for schedulable TaskInstances or complete DagRuns</p></li>
<li><p>Select schedulable TaskInstances, and whilst respecting Pool limits and other concurrency limits, enqueue
them for execution</p></li>
</ul>
<p>This does however place some requirements on the Database.</p>
</div>
<div class="section" id="database-requirements">
<span id="scheduler-ha-db-requirements"></span><h3>Database Requirements<a class="headerlink" href="#database-requirements" title="Permalink to this headline"></a></h3>
<p>The short version is that users of PostgreSQL 9.6+ or MySQL 8+ are all ready to go -- you can start running as
many copies of the scheduler as you like -- there is no further set up or config options needed. If you are
using a different database please read on.</p>
<p>To maintain performance and throughput there is one part of the scheduling loop that does a number of
calculations in memory (because having to round-trip to the DB for each TaskInstance would be too slow) so we
need to ensure that only a single scheduler is in this critical section at once - otherwise limits would not
be correctly respected. To achieve this we use database row-level locks (using <code class="docutils literal notranslate"><span class="pre">SELECT</span> <span class="pre">...</span> <span class="pre">FOR</span> <span class="pre">UPDATE</span></code>).</p>
<p>This critical section is where TaskInstances go from scheduled state and are enqueued to the executor, whilst
ensuring the various concurrency and pool limits are respected. The critical section is obtained by asking for
a row-level write lock on every row of the Pool table (roughly equivalent to <code class="docutils literal notranslate"><span class="pre">SELECT</span> <span class="pre">*</span> <span class="pre">FROM</span> <span class="pre">slot_pool</span> <span class="pre">FOR</span>
<span class="pre">UPDATE</span> <span class="pre">NOWAIT</span></code> but the exact query is slightly different).</p>
<p>The following databases are fully supported and provide an &quot;optimal&quot; experience:</p>
<ul class="simple">
<li><p>PostgreSQL 9.6+</p></li>
<li><p>MySQL 8+</p></li>
</ul>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>MariaDB does not implement the <code class="docutils literal notranslate"><span class="pre">SKIP</span> <span class="pre">LOCKED</span></code> or <code class="docutils literal notranslate"><span class="pre">NOWAIT</span></code> SQL clauses (see <a class="reference external" href="https://jira.mariadb.org/browse/MDEV-13115">MDEV-13115</a>). Without these features running multiple schedulers is not
supported and deadlock errors have been reported.</p>
</div>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>MySQL 5.x also does not support <code class="docutils literal notranslate"><span class="pre">SKIP</span> <span class="pre">LOCKED</span></code> or <code class="docutils literal notranslate"><span class="pre">NOWAIT</span></code>, and additionally is more prone to deciding
queries are deadlocked, so running with more than a single scheduler on MySQL 5.x is not supported or
recommended.</p>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Microsoft SQLServer has not been tested with HA.</p>
</div>
</div>
<div class="section" id="scheduler-tuneables">
<span id="scheduler-ha-tunables"></span><h3>Scheduler Tuneables<a class="headerlink" href="#scheduler-tuneables" title="Permalink to this headline"></a></h3>
<p>The following config settings can be used to control aspects of the Scheduler HA loop.</p>
<ul>
<li><p><a class="reference internal" href="configurations-ref.html#config-scheduler-max-dagruns-to-create-per-loop"><span class="std std-ref">max_dagruns_to_create_per_loop</span></a></p>
<p>This changes the number of dags that are locked by each scheduler when
creating dag runs. One possible reason for setting this lower is if you
have huge dags and are running multiple schedules, you won't want one
scheduler to do all the work.</p>
</li>
<li><p><a class="reference internal" href="configurations-ref.html#config-scheduler-max-dagruns-per-loop-to-schedule"><span class="std std-ref">max_dagruns_per_loop_to_schedule</span></a></p>
<p>How many DagRuns should a scheduler examine (and lock) when scheduling
and queuing tasks. Increasing this limit will allow more throughput for
smaller DAGs but will likely slow down throughput for larger (&gt;500
tasks for example) DAGs. Setting this too high when using multiple
schedulers could also lead to one scheduler taking all the dag runs
leaving no work for the others.</p>
</li>
<li><p><a class="reference internal" href="configurations-ref.html#config-scheduler-use-row-level-locking"><span class="std std-ref">use_row_level_locking</span></a></p>
<p>Should the scheduler issue <code class="docutils literal notranslate"><span class="pre">SELECT</span> <span class="pre">...</span> <span class="pre">FOR</span> <span class="pre">UPDATE</span></code> in relevant queries.
If this is set to False then you should not run more than a single
scheduler at once</p>
</li>
<li><p><a class="reference internal" href="configurations-ref.html#config-scheduler-pool-metrics-interval"><span class="std std-ref">pool_metrics_interval</span></a></p>
<p>How often (in seconds) should pool usage stats be sent to statsd (if
statsd_on is enabled). This is a <em>relatively</em> expensive query to compute
this, so this should be set to match the same period as your statsd roll-up
period.</p>
</li>
<li><p><a class="reference internal" href="configurations-ref.html#config-scheduler-clean-tis-without-dagrun-interval"><span class="std std-ref">clean_tis_without_dagrun_interval</span></a></p>
<p>How often should each scheduler run a check to &quot;clean up&quot; TaskInstance rows
that are found to no longer have a matching DagRun row.</p>
<p>In normal operation the scheduler won't do this, it is only possible to do
this by deleting rows via the UI, or directly in the DB. You can set this
lower if this check is not important to you -- tasks will be left in what
ever state they are until the cleanup happens, at which point they will be
set to failed.</p>
</li>
<li><p><a class="reference internal" href="configurations-ref.html#config-scheduler-orphaned-tasks-check-interval"><span class="std std-ref">orphaned_tasks_check_interval</span></a></p>
<p>How often (in seconds) should the scheduler check for orphaned tasks or dead
SchedulerJobs.</p>
<p>This setting controls how a dead scheduler will be noticed and the tasks it
was &quot;supervising&quot; get picked up by another scheduler. (The tasks will stay
running, so there is no harm in not detecting this for a while.)</p>
<p>When a SchedulerJob is detected as &quot;dead&quot; (as determined by
<a class="reference internal" href="configurations-ref.html#config-scheduler-scheduler-health-check-threshold"><span class="std std-ref">scheduler_health_check_threshold</span></a>) any running or
queued tasks that were launched by the dead process will be &quot;adopted&quot; and
monitored by this scheduler instead.</p>
</li>
</ul>
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<li><a class="reference internal" href="#">Scheduler</a><ul>
<li><a class="reference internal" href="#triggering-dag-with-future-date">Triggering DAG with Future Date</a></li>
<li><a class="reference internal" href="#running-more-than-one-scheduler">Running More Than One Scheduler</a><ul>
<li><a class="reference internal" href="#overview">Overview</a></li>
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