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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-52/">SRE Weekly Issue #52</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-52/">December 26, 2016</a>
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<a href="https://sreweekly.com/sre-weekly-issue-52/" title="Permalink to SRE Weekly Issue #52" class="email_only">View on sreweekly.com</a>
<p>Merry Decemberween, all!  Much like trash pickup service, SRE Weekly comes one day late when it falls on a holiday.</p>
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<h2 style="text-align: center; font-size: 55%; color: #b0b0b0;">SPONSOR MESSAGE</h2>
<p>The &#8220;2016/17 State of On-Call&#8221; report from VictorOps is now available to download. Learn what 800+ respondents have to say about life on-call, and steps they&#8217;re taking to make it better. Get your free copy here: <a href="https://victorops.com/state-of-on-call">https://victorops.com/state-of-on-call</a></p>
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<h2>Articles</h2>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.vividcortex.com/blog/why-percentiles-dont-work-the-way-you-think" target="_blank">Why Percentiles Don’t Work the Way you Think</a></div>
<div class="sreweekly-description">
<p>Percentiles are tricky beasts. Does that graph really mean what you think it means?</p>
<blockquote><p>The math is just broken. An average of a percentile is meaningless.</p></blockquote>
<p><small><em>Thanks to Devops Weekly for this one.</em></small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.theguardian.com/technology/2016/dec/14/uber-self-driving-cars-run-red-lights-san-francisco" target="_blank">Uber blames humans for self-driving car traffic offenses as California orders halt</a></div>
<div class="sreweekly-description">
<p>There&#8217;s that magical &#8220;human error&#8221; again.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://resources.changeip.com/recent-changeip-outage/" target="_blank">Recent ChangeIP Outage</a></div>
<div class="sreweekly-description">
<p>ChangeIP suffered a major outage two weeks ago and they posted this analysis of the incident. Thanks, folks! Does this sound familiar?</p>
<blockquote><p>We learned that when we started providing this service to the world, we made design and data layout decisions that made sense at the time but no longer do.</p></blockquote>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.awsarchitectureblog.com/2014/04/shuffle-sharding.html" target="_blank">Shuffle Sharding: massive and magical fault isolation</a></div>
<div class="sreweekly-description">
<p>Shuffle sharding is a nifty technique for preventing impact from spreading to multiple users of your service. A great example is the way Route 53 assigns nameservers for hosted DNS zones:</p>
<p><tt>sreweekly.com. 172800 IN NS ns-442.awsdns-55.com.<br />
sreweekly.com. 172800 IN NS ns-894.awsdns-47.net.<br />
sreweekly.com. 172800 IN NS ns-1048.awsdns-03.org.<br />
sreweekly.com. 172800 IN NS ns-1678.awsdns-17.co.uk.<br />
</tt></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.fastly.com/blog/building-and-scaling-fastly-network-part-2-balancing-requests" target="_blank">Building and scaling the Fastly network, part 2: balancing requests</a></div>
<div class="sreweekly-description">
<p>Fastly has a brilliant, simple, and clever solution to load balancing and connection draining using a switch ignorant of layer 4.</p>
<blockquote><p>Incurring connection resets on upgrades has ramifications far beyond disrupting production traffic: it provides a disincentive for continuous software deployment.</p></blockquote>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://status.heroku.com/incidents/1001" target="_blank">Heroku Incident 1001: EU Region Network Latency</a></div>
<div class="sreweekly-description">
<p>Heroku shared a post-analysis of their major outage on December 15.</p>
<p><small><em>Full disclosure: Heroku is my employer.</em></small></p>
</div>
</div>
<h2>Outages</h2>
<ul class="sreweekly-outages">
<li><a href="https://news.ntppool.org/2016/12/load/">NTP server pool</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">Load on the worldwide NTP server pool increased significantly due to a &#8220;buggy Snapchat app update&#8221;. What was Snapchat doing with NTP? (<a href="https://en.wikipedia.org/wiki/NTP_server_misuse_and_abuse#Snapchat_on_iOS">more details</a>)</li>
</ul>
</li>
<li><a href="https://mobile.twitter.com/zappos/status/811417629697028096">Zappos</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">Zappos had a cross-promotion with T-Mobile, and the traffic overloaded them.<small><em>Thanks to Amanda Gilmore for this one.</em></small></li>
</ul>
</li>
<li><a href="https://status.slack.com/2016-12/92ca538bc556e84f">Slack</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">Among other forms of impairment, /-commands were repeated numerous times. At <tt>$JOB</tt>, this meant that people accidentally paged their coworkers over and over until we disabled PagerDuty.</li>
</ul>
</li>
<li><a href="https://status.librato.com/incidents/8mygk2dhtj9p">Librato</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">&#8220;What went well&#8221; is an important part of any post-analysis.</li>
</ul>
</li>
<li><a href="http://www.dailymail.co.uk/sciencetech/article-4057780/Tumblr-hacked-Cyber-criminals-site-Europe-online-attack-just-fun.html">Tumblr</a></li>
<li><a href="http://kfoxtv.com/news/nation-world/southwest-airlines-website-goes-offline">Southwest Airlines</a></li>
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