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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-79/">SRE Weekly Issue #79</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-79/">July 3, 2017</a>
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<a href="https://sreweekly.com/sre-weekly-issue-79/" title="Permalink to SRE Weekly Issue #79" class="email_only">View on sreweekly.com</a>
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<h2>Articles</h2>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://preaccidentpodcast.podbean.com/e/safety-moment-who-failed-or-what-failed/" target="_blank">Safety Moment &#8211; Who Failed or What Failed?</a></div>
<div class="sreweekly-description">
<p>Asking &#8220;what failed?&#8221; can point an investigation in an entirely different and more productive direction.</p>
<blockquote><p>[&#8230;] the power you have is not in the answer to your question; it&#8217;s in the question [&#8230;]</p></blockquote>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://jvns.ca/blog/2017/06/03/async-io-on-linux--select--poll--and-epoll/" target="_blank">Async IO on Linux: select, poll, and epoll</a></div>
<div class="sreweekly-description">
<p>If you&#8217;re planning to write reliable, well-performing server code in Linux, you&#8217;ll need to know how to use <tt>epoll</tt>. Here&#8217;s Julia Evans to tell you what she learned about epoll and related syscalls.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://bravenewgeek.com/you-cannot-have-exactly-once-delivery-redux/" target="_blank">You Cannot Have Exactly-Once Delivery Redux – Brave New Geek</a></div>
<div class="sreweekly-description">
<p>Tyler Treat rectifies Kafka 0.11&#8217;s exactly-once semantics with his classic article, &#8220;You Cannot Have Exactly-Once Delivery&#8221;.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://dzone.com/refcardz/scalability" target="_blank">Scalability &amp; High Availability</a></div>
<div class="sreweekly-description">
<p>A &#8220;refcard&#8221; from Dzone covering a wide range of SRE basics, including load balancing, caching, clustering, redundancy, and fault tolerance.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.pagerduty.com/blog/babyduty/" target="_blank">BabyDuty or: How PagerDuty Accidentally Prepared me for Fatherhood</a></div>
<div class="sreweekly-description">
<p>A PagerDuty engineer applies on-the-job expertise to labor, delivery, and parenting. Lots of concepts translate pretty well. Some&#8230; not so much.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://blog.samstokes.co.uk/blog/2016/02/24/quality-vs-empathy/" target="_blank">Let&#8217;s stop talking about quality</a></div>
<div class="sreweekly-description">
<p>As an SRE, I want &#8220;quality&#8221; code to be shipped so that our system is reliable. But what am I really after? Sam Stokes says we should avoid using the term &#8220;quality&#8221; in favor of finding common ground and understanding the whole situation.</p>
<blockquote><p>The reality is that doing anything in the real world involves difficult decisions in the face of constraints.</p></blockquote>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://honeycomb.io/blog/2017/06/build-observable-systems/" target="_blank">Build Observable Systems</a></div>
<div class="sreweekly-description">
<blockquote><p>The value of logs is in what questions you can answer with them.</p></blockquote>
<blockquote><p>A sample rate of 20 means “there were 19 other events just like this one”. A sample rate of 1 means “this event is interesting on its own”.</p></blockquote>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://blog.statuspage.io/why-signiant-uses-statuspage" target="_blank">Why Signiant uses StatusPage instead of a DIY tool</a></div>
<div class="sreweekly-description">
<blockquote><p>The Signiant team previously had no dedicated solution for incident communication. As a result, any hiccup in service resulted in a flooded queue for service agents and a stuffed inbox of &#8220;what’s going on here&#8221; notes from internal team members.</p></blockquote>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://programmingisterrible.com/post/162346490883/how-do-you-cut-a-monolith-in-half" target="_blank">How do you cut a monolith in half?</a></div>
<div class="sreweekly-description">
<blockquote><p>In practice, a message broker is a service that transforms network errors and machine failures into filled disks.</p></blockquote>
<blockquote><p>Queues inevitably run in two states: full, or empty.</p></blockquote>
<blockquote><p>You can use a message broker to glue systems together, but never use one to cut systems apart.</p></blockquote>
</div>
</div>
<h2>Outages</h2>
<ul class="sreweekly-outages">
<li><a href="https://status.fastly.com/incidents/rp4mvyd4tzx1">Fastly</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">A big, but brief, global degradation in Fastly. [<a href="http://bgr.com/2017/06/28/internet-outage-fastly-cnn-nyt/">related news story</a>]</li>
</ul>
</li>
<li><a href="https://www.theregister.co.uk/2017/06/29/rackspace_hit_with_global_outage/">Rackspace</a></li>
<li><a href="https://twitter.com/SREWeekly/status/881695417355956225">Pinboard.in</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">Pinboard.in experienced a bit of feature degradation as its admin replaced a disk. I&#8217;m only including this because it meant that I couldn&#8217;t post this issue on time. ;)
<p><a href="https://pinboard.in/">Pinboard</a>&#8216;s really awesome, and I wouldn&#8217;t be able to put together this newsletter without it. The API is super-simple to use, and I&#8217;m able to save and classify links right on my phone. A+, would socially bookmark with again.</li>
</ul>
</li>
</ul>
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