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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-172/">SRE Weekly Issue #172</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-172/">May 12, 2019</a>
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<a href="https://sreweekly.com/sre-weekly-issue-172/" title="Permalink to SRE Weekly Issue #172" class="email_only">View on sreweekly.com</a>
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<p>[You’re Invited] Puppet, Splunk and VictorOps are teaming up for a live webinar on powering continuous improvement by combining analytics, incident response and automation. Learn best practices for releasing better applications faster, without the fire drills.</p>
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<h2>Articles</h2>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://spectrum.ieee.org/aerospace/aviation/how-the-boeing-737-max-disaster-looks-to-a-software-developer" target="_blank">How the Boeing 737 Max Disaster Looks to a Software Developer &#8211; IEEE Spectrum</a></div>
<div class="sreweekly-description">
<p>An experienced pilot and programmer details the background behind the 737 MAX&#8217;s MCAS system and discusses the risks and motivations involved.</p>
<blockquote><p>Boeing’s solution to its hardware problem was software.</p></blockquote>
<p><small><em>Thanks to John Goerzen for this one.</em></small></p>
<p><small>Gregory Travis — IEEE Spectrum</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.getrevue.co/profile/resilience/issues/resilience-roundup-cognitive-systems-engineering-new-wine-in-new-bottles-issue-32-175912" target="_blank">Resilience Roundup &#8211; Cognitive Systems Engineering: New wine in new bottles</a></div>
<div class="sreweekly-description">
<p>A detailed analysis of a paper by Eric Hollnagel and David Woods on designing systems that include humans and computers.</p>
<blockquote><p>The operator detects failures better when he participates in system control as opposed to functioning only as a monitor&#8230;</p></blockquote>
<p><small>Thai Wood (summary) </small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://ryanfrantz.com/posts/failure-is-familiar-safety-is-surprising.html" target="_blank">Failure is Familiar, Safety is Surprising</a></div>
<div class="sreweekly-description">
<p>An essay on the difference in philosophies between Safety I and Safety II and on understanding how our systems succeed rather than focusing on how they fail.</p>
<p><small>Ryan Frantz </small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://searchcloudcomputing.techtarget.com/news/252463190/Microsoft-to-reduce-Azure-outages-with-Project-Tardigrade" target="_blank">Microsoft to reduce Azure outages with Project Tardigrade<br />
</a></div>
<div class="sreweekly-description">
<p>Azure&#8217;s project tardigrade is exploring interesting ideas like keeping VMs resident in memory even when the host kernel reboots. This reminds me of another <a href="https://engineering.linkedin.com/blog/2017/11/resilience-engineering-at-linkedin-with-project-waterbear">similarly-named project</a>.</p>
<p><small>Chris Kanaracus — TechTarget</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.honeycomb.io/blog/anatomy-of-a-cascading-failure/" target="_blank">Anatomy of a Cascading Failure</a></div>
<div class="sreweekly-description">
<p>This is a followup to an article from last week about a Honeycomb incident, going into more detail on what went wrong and how they figured it out using Honeycomb itself.</p>
<p><small>Douglas Soo — Honeycomb</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://engineering.grab.com/preventing-pipeline-calls-from-crashing-redis-clusters" target="_blank">Preventing Pipeline Calls from Crashing Redis Clusters</a></div>
<div class="sreweekly-description">
<blockquote><p>On Feb 15th, 2019, a slave node in Redis, an in-memory data structure storage, failed requiring a replacement.</p>
<p>[&#8230;]</p>
<p>This blog post describes Grab’s post-mortem findings for the outage caused by the Redis Cluster failure.</p></blockquote>
<p><small>· Michael Cartmell, Jiahao Huang, and Sandeep Kumar — Grab</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://blogs.dropbox.com/tech/2019/05/how-we-optimized-magic-pocket-for-cold-storage/" target="_blank">How we optimized Magic Pocket for cold storage</a></div>
<div class="sreweekly-description">
<p>I like how their chosen solution fetches from all the datacenters in the normal case, so they don&#8217;t experience a sudden shift in traffic pattern during a failover.</p>
<p><small>Preslav Le — Dropbox </small></p>
</div>
</div>
<h2>Outages</h2>
<ul class="sreweekly-outages">
<li><a href="https://www.githubstatus.com/incidents/chq6jdw9x8t5">GitHub</a></li>
<li><a href="https://www.google.com/appsstatus#hl=en&amp;v=issue&amp;sid=1&amp;iid=e287a05e9ee515a2ad24a58eaa5b2e33">Gmail</a></li>
<li><a href="https://www.zdnet.com/article/software-update-crashes-police-ankle-monitors-in-the-netherlands/">Ankle Bracelets in the Netherlands </a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">These are the ankle bracelets used to monitor and enforce house arrest.<br />
<blockquote><p>the Dutch Ministry of Justice and Security had to step in and preemptively arrest and jail some of its most high-risk suspects</p></blockquote>
</li>
</ul>
</li>
<li><a href="https://reddit.statuspage.io/incidents/r3ftz0qp2nn6">Reddit</a></li>
<li><a href="https://www.theepochtimes.com/facebook-reportedly-down-for-many-users_2910896.html">Facebook and Instagram</a></li>
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