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<li class="toctree-l1 current"><a class="current reference internal" href="#">Scheduling workflow</a><ul>
<li class="toctree-l2"><a class="reference internal" href="#setting-up-a-schedule">Setting up a schedule</a></li>
<li class="toctree-l2"><a class="reference internal" href="#running-scheduler">Running scheduler</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#setting-an-alert-if-a-workflow-doesn-t-finish-within-expected-time">Setting an alert if a workflow doesn’t finish within expected time</a><ul>
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<div class="section" id="scheduling-workflow">
<h1>Scheduling workflow<a class="headerlink" href="#scheduling-workflow" title="Permalink to this headline">¶</a></h1>
<div class="contents local topic" id="contents">
<ul class="simple">
<li><p><a class="reference internal" href="#setting-up-a-schedule" id="id2">Setting up a schedule</a></p></li>
<li><p><a class="reference internal" href="#running-scheduler" id="id3">Running scheduler</a></p></li>
<li><p><a class="reference internal" href="#checking-scheduling-status" id="id4">Checking scheduling status</a></p></li>
<li><p><a class="reference internal" href="#setting-an-alert-if-a-workflow-doesn-t-finish-within-expected-time" id="id5">Setting an alert if a workflow doesn’t finish within expected time</a></p>
<ul>
<li><p><a class="reference internal" href="#options" id="id6">Options</a></p></li>
</ul>
</li>
<li><p><a class="reference internal" href="#skipping-a-next-workflow-session" id="id7">Skipping a next workflow session</a></p></li>
<li><p><a class="reference internal" href="#skipping-backfill" id="id8">Skipping backfill</a></p></li>
<li><p><a class="reference internal" href="#set-start-end" id="id9">Set start/end</a></p></li>
</ul>
</div>
<div class="section" id="setting-up-a-schedule">
<h2><a class="toc-backref" href="#id2">Setting up a schedule</a><a class="headerlink" href="#setting-up-a-schedule" title="Permalink to this headline">¶</a></h2>
<p>To run a workflow periodically, add a <code class="docutils literal notranslate"><span class="pre">schedule:</span></code> option to top-level workflow definitions.</p>
<div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">timezone</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">UTC</span>
<span class="nt">schedule</span><span class="p">:</span>
<span class="nt">daily></span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">07:00:00</span>
<span class="nt">+step1</span><span class="p">:</span>
<span class="nt">sh></span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">tasks/shell_sample.sh</span>
</pre></div>
</div>
<p>In <code class="docutils literal notranslate"><span class="pre">schedule:</span></code> directive, you can choose one of following options:</p>
<table class="docutils align-default">
<colgroup>
<col style="width: 31%" />
<col style="width: 43%" />
<col style="width: 26%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Syntax</p></th>
<th class="head"><p>Description</p></th>
<th class="head"><p>Example</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>hourly>: <code class="docutils literal notranslate"><span class="pre">MM:SS</span></code></p></td>
<td><p>Run this job every hour at MM:SS</p></td>
<td><p>hourly>: 30:00</p></td>
</tr>
<tr class="row-odd"><td><p>daily>: <code class="docutils literal notranslate"><span class="pre">HH:MM:SS</span></code></p></td>
<td><p>Run this job every day at HH:MM:SS</p></td>
<td><p>daily>: 07:00:00</p></td>
</tr>
<tr class="row-even"><td><p>weekly>: <code class="docutils literal notranslate"><span class="pre">DDD,HH:MM:SS</span></code></p></td>
<td><p>Run this job every week on DDD at HH:MM:SS</p></td>
<td><p>weekly>: Sun,09:00:00</p></td>
</tr>
<tr class="row-odd"><td><p>monthly>: <code class="docutils literal notranslate"><span class="pre">D,HH:MM:SS</span></code></p></td>
<td><p>Run this job every month on D at HH:MM:SS</p></td>
<td><p>monthly>: 1,09:00:00</p></td>
</tr>
<tr class="row-even"><td><p>minutes_interval>: <code class="docutils literal notranslate"><span class="pre">M</span></code></p></td>
<td><p>Run this job every this number of minutes</p></td>
<td><p>minutes_interval>: 30</p></td>
</tr>
<tr class="row-odd"><td><p>cron>: <code class="docutils literal notranslate"><span class="pre">CRON</span></code></p></td>
<td><p>Use cron format for complex scheduling</p></td>
<td><p>cron>: 42 4 1 * *</p></td>
</tr>
</tbody>
</table>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>When a field is starting with <code class="docutils literal notranslate"><span class="pre">*</span></code> , enclosing in quotes is necessary by a limitasion to be a vaild YAML.</p>
</div>
<p><code class="docutils literal notranslate"><span class="pre">digdag</span> <span class="pre">check</span></code> command shows when the first schedule will start:</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$</span> ./digdag check
<span class="go"> ...</span>
<span class="go"> Schedules (1 entries):</span>
<span class="go"> daily_job:</span>
<span class="go"> daily>: "07:00:00"</span>
<span class="go"> first session time: 2016-02-10 16:00:00 -0800</span>
<span class="go"> first scheduled to run at: 2016-02-10 23:00:00 -0800 (in 11h 16m 32s)</span>
</pre></div>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<div class="line-block">
<div class="line">When you use <code class="docutils literal notranslate"><span class="pre">hourly</span></code>, <code class="docutils literal notranslate"><span class="pre">daily</span></code>, <code class="docutils literal notranslate"><span class="pre">weekly</span></code> or <code class="docutils literal notranslate"><span class="pre">monthly</span></code>, a session time may not be same with actual run time.</div>
<div class="line">The session time is actual run day’s 00:00:00 (in case <code class="docutils literal notranslate"><span class="pre">hourly</span></code>, hour’s 00:00).</div>
</div>
<table class="docutils align-default" id="id1">
<caption><span class="caption-text">Schedule Examples (As of system clock: 2019-02-24 14:20:10 +0900)</span><a class="headerlink" href="#id1" title="Permalink to this table">¶</a></caption>
<colgroup>
<col style="width: 32%" />
<col style="width: 34%" />
<col style="width: 34%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>schedule</p></th>
<th class="head"><p>first session time</p></th>
<th class="head"><p>first scheduled to run at</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>hourly>: “32:32”</p></td>
<td><p>2019-02-24 14:00:00 +0900</p></td>
<td><p>2019-02-24 14:32:32 +0900</p></td>
</tr>
<tr class="row-odd"><td><p>daily>: “10:32:32”</p></td>
<td><p>2019-02-25 00:00:00 +0900</p></td>
<td><p>2019-02-25 10:32:32 +0900</p></td>
</tr>
<tr class="row-even"><td><p>weekly>: “2,10:32:32”</p></td>
<td><p>2019-02-26 00:00:00 +0900</p></td>
<td><p>2019-02-26 10:32:32 +0900</p></td>
</tr>
<tr class="row-odd"><td><p>monthly>: “2,10:32:32”</p></td>
<td><p>2019-03-02 00:00:00 +0900</p></td>
<td><p>2019-03-02 10:32:32 +0900</p></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="section" id="running-scheduler">
<h2><a class="toc-backref" href="#id3">Running scheduler</a><a class="headerlink" href="#running-scheduler" title="Permalink to this headline">¶</a></h2>
<p><code class="docutils literal notranslate"><span class="pre">digdag</span> <span class="pre">scheduler</span></code> command runs the schedules:</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$</span> ./digdag scheduler
</pre></div>
</div>
<p>When you change workflow definition, the scheduler reloads <code class="docutils literal notranslate"><span class="pre">digdag.dig</span></code> file automatically so that you don’t have to restart it.</p>
</div>
<div class="section" id="checking-scheduling-status">
<h2><a class="toc-backref" href="#id4">Checking scheduling status</a><a class="headerlink" href="#checking-scheduling-status" title="Permalink to this headline">¶</a></h2>
<p>You can use <a class="reference external" href="command_reference.html#client-mode-commands">Client-mode commands</a> to manage the schedules.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The scheduler command listens on <code class="docutils literal notranslate"><span class="pre">http://127.0.0.1:65432</span></code> by default. It accepts connection only from 127.0.0.1 (localhost). This is for a security reason so that it doesn’t open the port to the public network. To change the listen address, please use <code class="docutils literal notranslate"><span class="pre">--bind</span> <span class="pre">ADDRESS</span></code> option.</p>
</div>
</div>
<div class="section" id="setting-an-alert-if-a-workflow-doesn-t-finish-within-expected-time">
<h2><a class="toc-backref" href="#id5">Setting an alert if a workflow doesn’t finish within expected time</a><a class="headerlink" href="#setting-an-alert-if-a-workflow-doesn-t-finish-within-expected-time" title="Permalink to this headline">¶</a></h2>
<div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">timezone</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">UTC</span>
<span class="nt">schedule</span><span class="p">:</span>
<span class="nt">daily></span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">07:00:00</span>
<span class="nt">sla</span><span class="p">:</span>
<span class="c1"># triggers this task at 02:00</span>
<span class="nt">time</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">02:00</span>
<span class="nt">+notice</span><span class="p">:</span>
<span class="nt">sh></span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">notice.sh</span>
<span class="nt">+long_running_job</span><span class="p">:</span>
<span class="nt">sh></span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">long_running_job.sh</span>
</pre></div>
</div>
<p>In sla: directive, you can select either the <code class="docutils literal notranslate"><span class="pre">time</span></code> or <code class="docutils literal notranslate"><span class="pre">duration</span></code> option.</p>
<div class="section" id="options">
<h3><a class="toc-backref" href="#id6">Options</a><a class="headerlink" href="#options" title="Permalink to this headline">¶</a></h3>
<p>This parameter supports fail: BOOLEAN and alert: BOOLEAN options. Setting fail: true makes the workflow failed. Setting alert: true sends an notification using above notification mechanism.</p>
<ul class="simple">
<li><p>Setting <code class="docutils literal notranslate"><span class="pre">fail:</span> <span class="pre">true</span></code> makes the workflow failed.</p></li>
<li><p>Setting <code class="docutils literal notranslate"><span class="pre">alert:</span> <span class="pre">true</span></code> sends an notification using above notification mechanism.</p></li>
</ul>
</div>
</div>
<div class="section" id="skipping-a-next-workflow-session">
<h2><a class="toc-backref" href="#id7">Skipping a next workflow session</a><a class="headerlink" href="#skipping-a-next-workflow-session" title="Permalink to this headline">¶</a></h2>
<p>Sometimes you have frequently running workflows (e.g. sessions every 30 or 60 minutes) that take longer than the duration between sessions. This variability in the duration of a workflow can occur for a number reasons. For example, you may be seeing an increase in the amount of data you are normally processing.</p>
<p>For example, let’s say we have a workflow that is running hourly, and it normally takes only 30 minutes. But it’s the holiday season and now there has been a huge increase in usage of your site – so much data is now being process the workflow is taking 1 hour and 30 minutes. During this time period, a 2nd workflow has started running for the following hour, which causes further strain on your available resources because both are running at the same time.</p>
<p>It’s this case it’s best to skip the next hour’s workflow session, and instead utilize the subsequent session to process 2 hours of data. To do this, we’ve added the following:</p>
<ul class="simple">
<li><p>Added a <code class="docutils literal notranslate"><span class="pre">skip_on_overtime:</span> <span class="pre">true</span> <span class="pre">|</span> <span class="pre">false</span></code> schedule option that can be used to control whether scheduled session execution should be skipped if another session is already running.</p></li>
<li><p>Scheduled workflow sessions now have a <code class="docutils literal notranslate"><span class="pre">last_executed_session_time</span></code> variable which contains the previously executed session time. It is usually same with <code class="docutils literal notranslate"><span class="pre">last_session_time</span></code> but has different value when <code class="docutils literal notranslate"><span class="pre">skip_on_overtime:</span> <span class="pre">true</span></code> is set or the session is the first execution.</p></li>
</ul>
</div>
<div class="section" id="skipping-backfill">
<h2><a class="toc-backref" href="#id8">Skipping backfill</a><a class="headerlink" href="#skipping-backfill" title="Permalink to this headline">¶</a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">skip_delayed_by</span></code> option enables <a class="reference external" href="command_reference.html#backfill">backfill</a> command to skip creating sessions delayed by the specified time. When Digdag restarts, sessions of a schedule are automatically created until the next of <code class="docutils literal notranslate"><span class="pre">last_session_time</span></code>.</p>
<p>For example, If Digdag restarts at 20:00:00 and a workflow scheduled as below, it creates three sessions (19:59:00, 19:58:00 and 19:57:00). And then, Digdag doesn’t create sessions which are before 19:56:00 by the option.</p>
<div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">schedule</span><span class="p">:</span>
<span class="nt">minutes_interval></span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">1</span>
<span class="nt">skip_delayed_by</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">3m</span>
<span class="nt">+setup</span><span class="p">:</span>
<span class="nt">sh></span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">echo ${session_time}</span>
</pre></div>
</div>
<p>Also, if your workflow starts with delay <code class="docutils literal notranslate"><span class="pre">skip_delayed_by</span></code> option takes effect as well.</p>
<p>For example, your scheduling looks like this.
If the workflow is executed at 16:02 due to some reason, the session will be skipped because <code class="docutils literal notranslate"><span class="pre">skip_delayed_by</span></code> is set to 1s and it is too late for the configured value.</p>
<div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">schedule</span><span class="p">:</span>
<span class="nt">cron></span><span class="p">:</span> <span class="s">'0</span><span class="nv"> </span><span class="s">16</span><span class="nv"> </span><span class="s">*</span><span class="nv"> </span><span class="s">*</span><span class="nv"> </span><span class="s">*'</span>
<span class="nt">skip_delayed_by</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">1s</span>
</pre></div>
</div>
</div>
<div class="section" id="set-start-end">
<h2><a class="toc-backref" href="#id9">Set start/end</a><a class="headerlink" href="#set-start-end" title="Permalink to this headline">¶</a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">start</span></code> and <code class="docutils literal notranslate"><span class="pre">end</span></code> options set period of schedule.
The option accepts date format <cite>YYYY-MM-DD</cite>.
When <code class="docutils literal notranslate"><span class="pre">start</span></code> is set, the schedule will start on and after <code class="docutils literal notranslate"><span class="pre">start</span></code>.
When <code class="docutils literal notranslate"><span class="pre">end</span></code> is set, the schedule will run until the day (include the day).
When next run time will be after the <code class="docutils literal notranslate"><span class="pre">end</span></code>, next schedule will be set to <cite>9999-01-01 00:00:00+0000</cite> and never kicked.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>After the schedule ends, if you change <code class="docutils literal notranslate"><span class="pre">end</span></code> date to extends the period, the schedule will be resumed from the last session.
It causes multiple session running unexpectedly.
For example, you set <cite>end: 2022-03-31</cite> and current date is <cite>2022-04-15</cite>.
Then you update <cite>end: 2022-04-31</cite>, the sessions between <cite>2022-04-01</cite> and <cite>2022-04-15</cite> will be kicked.
To avoid the case, recommend to set <code class="docutils literal notranslate"><span class="pre">skip_delayed_by</span></code>.</p>
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