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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-149/">SRE Weekly Issue #149</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-149/">November 25, 2018</a>
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<a href="https://sreweekly.com/sre-weekly-issue-149/" title="Permalink to SRE Weekly Issue #149" class="email_only">View on sreweekly.com</a>
<div class="sreweekly-sponsor-message" style="border: 1px solid #b0b0b0; padding-left: 1rem; padding-right: 1rem; width: 80%; align: center; margin: 2rem auto 2rem auto;">
<h2 style="text-align: center; font-size: 80%; color: #909090;">A message from our sponsor, VictorOps:</h2>
<p>Runbook automation leads to nearly instant on-call incident response. SRE teams can leverage runbook automation to deepen cross-team collaboration, surface context to on-call responders, and shorten the incident lifecycle–ultimately helping overall service reliability:</p>
<p><a href="http://try.victorops.com/sreweekly/runbook-automation-for-sre">http://try.victorops.com/sreweekly/runbook-automation-for-sre</a></p>
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<h2>Articles</h2>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://cloud.google.com/blog/products/serverless/cloud-functions-pro-tips-using-retries-to-build-reliable-serverless-systems/" target="_blank">Cloud Functions pro tips: Using retries to build reliable serverless systems | Google Cloud Blog</a></div>
<div class="sreweekly-description">
<blockquote><p>But does that mean you don’t need to think about reliability issues associated with large-scale distributed systems? The answer is, not completely. While there are many things that GCP and Cloud Functions handle behind the scenes, you still need to keep a couple of best practices in mind while building a reliable serverless solution.</p></blockquote>
<p><small>Slawomir Walkowski — Google</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.zdnet.com/article/emotet-malware-runs-on-a-dual-infrastructure-to-avoid-downtime-and-takedowns/" target="_blank">Emotet malware runs on a dual infrastructure to avoid downtime and takedowns</a></div>
<div class="sreweekly-description">
<blockquote><p>The Emotet malware gang is probably managing their server infrastructure better than most companies are running their internal or external IT systems.</p></blockquote>
<p><small>Catalin Cimpanu — Zero Day</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://dbmsmusings.blogspot.com/2011/12/replication-and-latency-consistency.html" target="_blank">DBMS Musings: Replication and the latency-consistency tradeoff</a></div>
<div class="sreweekly-description">
<p>Designing a distributed data store is about juggling competing priorities. This author discusses the latency penalty you pay for synchronous replication, and why you might want it anyway.</p>
<p><small>Daniel Abadi</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://codeascraft.com/2018/10/23/capacity-planning-for-etsys-web-and-api-tiers/" target="_blank"> Capacity planning for Etsy’s web and API clusters</a></div>
<div class="sreweekly-description">
<p>Learn how Etsy designed tooling and a repeatable process to forecast resource usage.</p>
<p><small>Daniel Schauenberg — Etsy</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://engineering.grab.com/chaos-engineering" target="_blank">Orchestrating Chaos using Grab&#8217;s Experimentation Platform</a></div>
<div class="sreweekly-description">
<p>Check out how Grab implemented chaos engineering.</p>
<p><small>Roman Atachiants, Tharaka Wijebandara, Abeesh Thomas — Grab</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://code.fb.com/developer-tools/predictive-test-selection-a-more-efficient-way-to-ensure-reliability-of-code-changes/" target="_blank">Predictive test selection to ensure reliable code changes</a></div>
<div class="sreweekly-description">
<p>Neat idea: use machine learning to select which automated tests to run for a given code change. The goal is a high likelihood of finding bugs while running fewer tests than traditional methods.</p>
<p><small>Mateusz Machalica, Alex Samylkin, Meredith Porth, and Satish Chandra — Facebook</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://auth0.com/blog/progressive-service-architecture-at-auth0/" target="_blank">Progressive Service Architecture At Auth0</a></div>
<div class="sreweekly-description">
<blockquote><p>In this blog post, we are going to discuss how the Auth0 Site Reliability team, led by Hernán Meydac Jean, used a progressive approach to build a mature service architecture characterized by high availability and reliability.</p></blockquote>
<p>The system in question is a home-grown feature flags implementation.</p>
<p><small>Dan Arias — Auth0</small></p>
</div>
</div>
<h2>Outages</h2>
<p>The usual glut of Black Friday outages.  I hope you all had an uneventful Friday.</p>
<ul class="sreweekly-outages">
<li><a href="https://www.newsweek.com/j-crew-black-friday-website-not-working-down-orders-1229068">J. Crew</a></li>
<li><a href="https://www.newsweek.com/lowes-black-friday-2018-website-not-working-down-1229540">Lowe&#8217;s</a></li>
<li><a href="https://www.thesun.co.uk/tech/7814050/netatmo-smart-heating-outage-down-freezing/">Netatmo (smart thermostats)</a></li>
<li><a href="https://www.independent.co.uk/life-style/gadgets-and-tech/news/john-lewis-down-website-black-friday-deals-offers-not-working-2018-a8648141.html">John Lewis</a></li>
<li><a href="http://www.theinvestor.co.kr/view.php?ud=20181122000711">AWS in Seoul, South Korea</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">The outage took down multiple AWS customers including banks and a cryptocurrency exchange.</li>
</ul>
</li>
<li><a href="https://www.tomsguide.com/us/black-friday-sales-crash-walmart,news-28621.html">Walmart</a></li>
<li><a href="https://mybroadband.co.za/news/internet/285980-makro-website-hit-by-huge-traffic-as-black-friday-sale-starts.html">Makro</a></li>
<li><a href="https://www.digit.in/general/facebook-blames-latest-outage-on-server-bug-apps-restored-after-hours-of-disruption-44770.html"> Facebook</a></li>
<li><a href="https://status.lastpass.com/incidents/lh2vcw3fcnh2">LastPass</a></li>
<li><a href="https://azure.microsoft.com/en-gb/status/history/">Microsoft Azure</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">Linked is a detailed followup post describing three distinct &#8220;root&#8221; causes.</li>
</ul>
</li>
</ul>
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