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<title>Solving problems using time travel</title>
<meta name="author" content="Simeon Simeonov">
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<h2>Solving problems using <em>time travel</em></h2>
<h4>Beryl @ Fifty</h4>
</br>
<p><small>Tomas Robertson (team ACE-OL) & Simeon Simeonov (team Forecasts)</small></p>
</section>
<section>
<h2>What is <em>time travel</em>???</h2>
<br/>
<p><em>Time travel</em> - our ability to look at our input data at the state it was at a specific point in time (not only at its last state).</p>
<p><em>Time travel</em> is achieved by adding the <em>record_created_time</em> column to our DB tables and storing Kafka's <em>created_time</em> value (converted to UTC).</p>
<br/>
<p>The main concepts around how and why were presented by Peter Sandberg.</p>
</section>
<section>
<h2>Solving problems</h2>
<br/>
<p>The following spike was observed 2021-10-06 around 10:15 CET @ NO4</p>
<img src="images/timetravel/ace_ol_spike.png"></img>
</section>
<section>
<h2>Solving problems (cont)</h2>
<br/>
<p>No spikes shown in Grafana</p>
<img src="images/timetravel/ace_ol_spike_grafana.png"></img>
</section>
<section>
<h2>Solving problems with <em>time travel</em></h2>
<br/>
<pre data-id="code-animation">
<code class="sql" data-trim type="text/template">
SELECT record_created_time, start_time, value
FROM misc.app_odin_ace_ol_ba_10s_avro_v01
WHERE bidding_area_name = 'NO4' AND start_time = '2021-10-06 08:14:10'
ORDER BY record_created_time;
</code>
</pre>
<table>
<thead>
<tr>
<th>record_created_time</th>
<th>start_time</th>
<th>value</th>
</tr>
</thead>
<tbody>
<tr>
<td>2021-10-06 08:15:52.258</td>
<td>2021-10-06 08:14:10</td>
<td>-370.37683609008127</td>
</tr>
<tr>
<td>2021-10-06 08:19:06.222</td>
<td>2021-10-06 08:14:10</td>
<td>25.183745117193457</td>
</tr>
<tr>
<td>2021-10-06 08:21:56.207</td>
<td>2021-10-06 08:14:10</td>
<td>34.78731922151518</td>
</tr>
</tbody>
</table>
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<h1>Q & A</h1>
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