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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-91/">SRE Weekly Issue #91</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-91/">October 1, 2017</a>
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<a href="https://sreweekly.com/sre-weekly-issue-91/" title="Permalink to SRE Weekly Issue #91" class="email_only">View on sreweekly.com</a>
<p>I&#8217;m heading to New York tomorrow and will be at Velocity Tuesday and Wednesday. If you&#8217;re there, look for the weirdo in the SRE Weekly shirt and hit me up for some nifty swag! Also, maybe check out <a href="https://conferences.oreilly.com/velocity/vl-ny/public/schedule/detail/60745">my talk on DNS</a>, if you&#8217;re into that kind of thing.</p>
<p>Thanks to an eagle-eyed reader for pointing out that I totally screwed up the HTML on the link last week. Oops.</p>
<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: 55%; color: #b0b0b0;">SPONSOR MESSAGE</h2>
<p>Like DevOps? Register for All Day DevOps &#8211; a FREE online conference this October, offering 100 DevOps-focused sessions across six different tracks. Learn more &amp; register:<br />
<a href="http://bit.ly/2waBukw">http://bit.ly/2waBukw</a></p>
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<h2>Articles</h2>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://blog.hostedgraphite.com/2016/04/26/no-brogrammers-practical-tips-for-writing-inclusive-job-ads/" target="_blank">No brogrammers: Practical tips for writing inclusive job ads</a></div>
<div class="sreweekly-description">
<p>Here&#8217;s how Hosted Graphite made their job ad for an SRE-like role (Ops Automation Engineer) more inclusive. The article is filled with specific before/after language snippets, each with a detailed explanation of why they made the change.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://dyn.com/blog/advanced-secondary-dns-for-the-technically-inclined/" target="_blank">Advanced Secondary DNS For The Technically Inclined</a></div>
<div class="sreweekly-description">
<p>A couple weeks after their major outage last October, Dyn published this article explaining secondary DNS. It&#8217;s a great primer and digs into what to do if you use advanced non-standard functionality like ALIAS records and traffic balancing.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://t.dripemail2.com/c/eyJhY2NvdW50X2lkIjoiMjY1Njc0MyIsImRlbGl2ZXJ5X2lkIjoiMTM0OTM0MDg1MSIsInVybCI6Imh0dHBzOi8vc2lnbmFsZnguY29tL2Jsb2cvcHJlZGljdGluZy1yZXNvdXJjZS1leGhhdXN0aW9uLWRvdWJsZS1leHBvbmVudGlhbC1zbW9vdGhpbmcvP19fcz1id3lrd2sxa2NjZW9nc3pxOGFidCJ9" target="_blank">Predicting Resource Exhaustion with Double Exponential Smoothing</a></div>
<div class="sreweekly-description">
<p>SignalFx goes into deep detail on their feature for predicting future metric values. We get an explanation of why prediction is difficult and a discussion of the math involved in their solution.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://blogs.dropbox.com/tech/2017/09/handling-system-failures-during-payment-communication/" target="_blank">Handling System Failures during Payment Communication</a></div>
<div class="sreweekly-description">
<p>Payments: we really have to get them right. Here&#8217;s DropBox&#8217;s Jessica Fisher with a discussion of how they reconcile failed payments.</p>
<blockquote><p>No matter what goes wrong, our top priority is to make sure that customers receive service for which they’ve been charged, and aren’t charged for service they haven’t received.</p></blockquote>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://dzone.com/articles/circuit-breaker-implementation-in-resilience4j" target="_blank">Circuit Breaker Implementation in Resilience4j</a></div>
<div class="sreweekly-description">
<p>A couple of weeks ago, I linked to a story about Resilience4j, a fault tolerance library for Java. This week is the second installment that shows you how to use it to implement circuit breakers. There&#8217;s also an interesting discussion of one of the implementation details.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://rachelbythebay.com/w/2017/09/27/2153/" target="_blank">ntpd won&#8217;t save you from one particular rogue bit</a></div>
<div class="sreweekly-description">
<p>Here&#8217;s a cute little debugging story. Turns out ntpd has a bit of a blind spot!</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://feedproxy.google.com/~r/HighScalability/~3/iRsnmCaun6w/adcash-1-trillion-http-requests-per-month.html" target="_blank">Adcash &#8211; 1 Trillion HTTP Requests Per Month</a></div>
<div class="sreweekly-description">
<p>Adcash CTO Arnaud Granal gives us a rare glimpse into the multiple iterations of their infrastructure. Hear what worked well and what didn&#8217;t as they scaled to handle <b>500k requests per second</b> at peak.</p>
</div>
</div>
<h2>Outages</h2>
<ul class="sreweekly-outages">
<li><a href="https://www.theregister.co.uk/2017/09/29/major_domain_name_server_goes_down_taking_websites_with_it/">OpenSRS (DNS provider)</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage"><a href="https://opensrs.com/">OpenSRS</a> (registrar and DNS provider, among other services) had a major outage in their DNS service.<br />
<blockquote><p>At 1AM UTC we were the target of a sophisticated DNS attack that was followed by an unrelated double failure of core network equipment at our main Canadian data center, caused by an undocumented software limitation.</p></blockquote>
<p>Yikes.</li>
</ul>
</li>
<li><a href="https://www.ttgmedia.com/news/technology/amadeus-suffers-major-it-network-issue-11742">Amadeus (airline booking system)</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage"><a href="http://www.amadeus.com">Amadeus</a> provides the technical underpinnings of many airlines around the world. They had issues this past week, taking a lot of airlines with them.</li>
</ul>
</li>
<li><a href="https://www.theregister.co.uk/2017/09/27/faulty_data_center_takes_out_sourceforge/">SourceForge</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">
<blockquote><p>Our [data center] hosting provider has been having issues with a power distribution unit.</p></blockquote>
</li>
</ul>
</li>
<li><a href="http://www.express.co.uk/life-style/science-technology/858892/Facebook-down-not-working-server-status">Facebook</a></li>
</ul>
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