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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-178/">SRE Weekly Issue #178</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-178/">July 28, 2019</a>
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<a href="https://sreweekly.com/sre-weekly-issue-178/" title="Permalink to SRE Weekly Issue #178" 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, VictorOps:</h2>
<p>Containers and microservices can improve development speed and service flexibility. But, more complex systems have a higher potential for incidents. Learn how SRE teams are building more reliable services and adding context to microservices and containerized environments:</p>
<p><a href="http://try.victorops.com/sreweekly/container-monitoring-and-alerting-best-practices">http://try.victorops.com/sreweekly/container-monitoring-and-alerting-best-practices</a></p>
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<h2>Articles</h2>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://dbmsmusings.blogspot.com/2019/07/the-dangers-of-conditional-consistency.html" target="_blank">The dangers of conditional consistency guarantees</a></div>
<div class="sreweekly-description">
<p>Imagine a database that promises consistency except in the case of a network partition, in which case it favors availability. That&#8217;s conditional consistency, and it&#8217;s effectively the same as <em>no</em> consistency.</p>
<p><small>Daniel Abadi</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://blog.heroku.com/puma-4-hammering-out-h13s-a-debugging-story" target="_blank">Puma 4: Hammering Out H13s—A Debugging Story</a></div>
<div class="sreweekly-description">
<blockquote><p>This is a story about distributed coordination, the TCP API, and how we debugged and fixed a bug in Puma that only shows up at scale.</p></blockquote>
<p><small>Richard Schneeman — Heroku</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.theregister.co.uk/2019/07/15/australian_switch_outage/" target="_blank">DDoS attack? Mad dash to file forms? No, errant network switch crashed Australian tax service</a></div>
<div class="sreweekly-description">
<p>Here&#8217;s more on the Australian Tax Office outage earlier this month.</p>
<p><small>Max Smolaks — The Register</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://rachelbythebay.com/w/2019/07/15/giant/" target="_blank">Your nines are not my nines<br />
</a></div>
<div class="sreweekly-description">
<p>Ever experience a total outage while your cloud provider still reports 99.999% availability? This one&#8217;s for you.</p>
<p><small>rachelbythebay</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://jbd.dev/prod-readiness/" target="_blank">Production readiness</a></div>
<div class="sreweekly-description">
<blockquote><p>What’s good or bad to do in production? And how do you transfer knowledge when new team members want to release production services or take the ownership of existing services?</p></blockquote>
<p><small>Jaana B. Dogan (JBD)</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.cnn.com/2019/07/25/asia/internet-undersea-cables-intl-hnk/index.html" target="_blank">The global internet is powered by vast undersea cables. But they&#8217;re vulnerable.</a></div>
<div class="sreweekly-description">
<p>The internet <em>is</em> a series of tubes — the kind that transmit light. Favorite thing I learned: fiber optic cables are sheathed in copper that powers repeaters along their length.</p>
<p><small> James Griffiths — CNN</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.darkreading.com/operations/black-hat-qanda-inside-the-black-hat-noc/d/d-id/1335341" target="_blank">Black Hat Q&amp;A: Inside the Black Hat NOC</a></div>
<div class="sreweekly-description">
<p>How do you build a reliable network when faced with highly skilled and motivated adversaries?</p>
<p><small>Alex Wawro — DARKReading</small></p>
</div>
</div>
<h2>Outages</h2>
<ul class="sreweekly-outages">
<li><a href="https://status.pagerduty.com/incidents/yw758ts5s2sm">PagerDuty</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">Click through for their write-up.</li>
</ul>
</li>
<li><a href="https://www.telecomtv.com/content/satellite/little-high-little-low-who-brought-down-europe-s-satnav-35772/">Galileo (European SatNav)</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">More detail <a href="https://insidegnss.com/update-galileo-service-degraded-on-all-satellites-precise-timing-facility-problems-cited/">here</a>.</li>
</ul>
</li>
<li><a href="https://www.thesun.co.uk/tech/9512072/amazon-down-prime-day-usa-not-working/">Amazon</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">This was the traditional Prime Day instability</li>
</ul>
</li>
<li><a href="https://www.macrumors.com/2019/07/15/apple-store-website-goes-down/">Apple Store Website</a></li>
<li><a href="https://www.githubstatus.com/incidents/tq7pm7mn9b1k">GitHub</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">See GitHub&#8217;s <a href="https://github.blog/2019-07-23-july-22-incident-update/">follow-up post</a> for a bit more detail.</li>
</ul>
</li>
<li><a href="https://status.slack.com/2019-07/71c400a19c9932e2">Slack</a></li>
</ul>
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