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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-304/">SRE Weekly Issue #304</a></h1>
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<div class="entry-date" itemprop="datePublished" >
<i class="genericon genericon-day"></i><a class="updated" href="https://sreweekly.com/sre-weekly-issue-304/">January 9, 2022</a>
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<a href="https://sreweekly.com/sre-weekly-issue-304/" title="Permalink to SRE Weekly Issue #304" class="email_only">View on sreweekly.com</a>
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<h2 style="text-align: center;font-size: 80%;color: #909090;">A message from our sponsor, <a href="https://rootly.com/demo/?utm_source=sreweekly">Rootly</a>:</h2>
<p>Manage incidents directly from Slack with Rootly 🚒. Automate manual admin tasks like creating incident channel, Jira and Zoom, paging the right team, postmortem timeline, setting up reminders, and more. Book a demo (+ get a snazzy Rootly shirt):<br>
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<h2 class="wp-block-heading">Articles</h2>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://ably.com/blog/channel-global-decoupling" target="_blank" rel="noopener">Channel global decoupling for region discovery</a></div>
<div class="sreweekly-description">
<p>Ably processes a lot of messages, so when they have to redesign a core part of their architecture, it gets pretty interesting.</p>
<p>&nbsp;&nbsp;<small>Simon Woolf — Ably</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://flyingbarron.medium.com/the-james-webb-space-telescope-making-300-points-of-failure-reliable-db669810a9d8" target="_blank" rel="noopener">The James Webb Space Telescope — making 300 points of failure reliable</a></div>
<div class="sreweekly-description">
<blockquote>
<p>If you ask any Site Reliability or DevOps engineer how they feel about a deployment plan with over 300 single points of failure, you’d see a lot of nauseous faces and an outbreak of nervous tics!</p>
</blockquote>
<p>Nevertheless, that was the best design. Read on to find out why.</p>
<p>&nbsp;&nbsp;<small>Robert Barron</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://slack.engineering/what-happened-during-slacks-dnssec-rollout/" target="_blank" rel="noopener">The Case of the Recursive Resolvers</a></div>
<div class="sreweekly-description">
<p>Slack had three separate incidents while trying to deploy DNSSEC for <code>slack.com</code>. This article goes into deep detail on what went wrong each time and what they learned.</p>
<blockquote>
<p>Yes, it was an oversight that we did not test a domain with a wildcard record before attempting slack.com — learn from our mistakes!</p>
</blockquote>
<p>&nbsp;&nbsp;<small>Rafael Elvira and Laura Nolan — Slack</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.blameless.com/sre/building-an-sre-team-with-specialization" target="_blank" rel="noopener">Building an SRE Team with Specialization</a></div>
<div class="sreweekly-description">
<p>The specializations outlined in this article include:</p>
<ul>
<li>The Educator</li>
<li>The SLO Guard</li>
<li>Infrastructure architect</li>
<li>Incident response leader</li>
</ul>
<p>&nbsp;&nbsp;<small>Emily Arnott — Blameless</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://highscalability.com/blog/2022/1/3/designing-whatsapp.html" target="_blank" rel="noopener">Designing&nbsp;WhatsApp</a></div>
<div class="sreweekly-description">
<p>If you had to design a WhatsApp today to support its current load, how would you go about it? Here&#8217;s one possible design.</p>
<p>&nbsp;&nbsp;<small>Ankit Sirmorya — High Scalability</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://jvns.ca/blog/2022/01/05/why-might-you-run-your-own-dns-server-/" target="_blank" rel="noopener">Why might you run your own DNS server?</a></div>
<div class="sreweekly-description">
<blockquote>
<p>Yesterday I asked on Twitter why you might want to run your own DNS servers, and I got a lot of great answers that I wanted to summarize here.</p>
</blockquote>
<p>&nbsp;&nbsp;<small>Julia Evans</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.pageittothelimit.com/the-void-with-courtney-nash/" target="_blank" rel="noopener">The VOID with Courtney Nash</a></div>
<div class="sreweekly-description">
<p>In this podcast interview, find out more about why Courtney Nash created the VOID and how posting an incident report can benefit your company. Transcript available.</p>
<p>&nbsp;&nbsp;<small>Mandy Walls (with guest Courtney Nash) — Page it to the Limit</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.honeycomb.io/blog/why-intuitive-troubleshooting-stopped-working/" target="_blank" rel="noopener">Why Intuitive Troubleshooting Has Stopped Working for You</a></div>
<div class="sreweekly-description">
<p>Drawing on Cynefin, this article explains why debugging by feel and guesswork won&#8217;t suffice anymore; we need to be methodical.</p>
<p>  <small>Pete Hodgson — Honeycomb</small></p>
</div>
</div>
</div></div>
<h2 class="wp-block-heading">Outages</h2>
<ul class="sreweekly-outages">
<li><a href="https://cryptonews.com/news/solana-repotedly-went-down-again-after-ddos-attack.htm">Solana</a></li>
<li><a href="https://status.finalsite.com/incidents/nfg7n13v6f0d">Finalsite</a></li>
<li><a href="https://economictimes.indiatimes.com/tech/technology/flipkart-website-app-down-for-some-users-in-india/articleshow/88661753.cms">Flipkart</a></li>
</ul>
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