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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-62/">SRE Weekly Issue #62</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-62/">March 5, 2017</a>
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<a href="https://sreweekly.com/sre-weekly-issue-62/" title="Permalink to SRE Weekly Issue #62" class="email_only">View on sreweekly.com</a>
<p>S3 fails, and suddenly it&#8217;s SRE &#8220;go-time&#8221; at companies everywhere!  I don&#8217;t know about you, but I sure am exhausted.</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>DevOps incident management at its finest. Start your free trial of VictorOps. <a href="http://try.victorops.com/sreweekly/trial">http://try.victorops.com/sreweekly/trial</a></p>
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<h2>Articles</h2>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://highscalability.com/blog/2010/8/12/think-of-latency-as-a-pseudo-permanent-network-partition.html" target="_blank">Think of Latency as a Pseudo-permanent Network Partition</a></div>
<div class="sreweekly-description">
<p>When you do as the title suggests, you realize that network partitions go from the realm of theoretical to everyday.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://blog.asana.com/2015/06/workstyle-ask-5-whys-to-get-to-the-root-of-any-problem/" target="_blank">Ask 5 Whys to get to the root of any problem</a></div>
<div class="sreweekly-description">
<p>Asana shares their &#8220;Five Whys&#8221; process, which they use not only for outages but even for missed deadlines. This caught my eye:</p>
<blockquote><p>Our team confidently focuses on problem mitigation while fighting a fire, knowing that there will be time for post-mortem and long-term fixes later.</p></blockquote>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.awsarchitectureblog.com/2014/05/organizing-software-deployments-to-match-failure-conditions.html" target="_blank">Organizing Software Deployments to Match Failure Conditions</a></div>
<div class="sreweekly-description">
<p>Using Route 53 as a case study, AWS engineers explain how they carefully designed their deploy process to reduce impact from failed deploys.</p>
<blockquote><p>One method to reduce potential impact is to shape your deployment strategies around the failure conditions of your service. Thus, when a deployment fails, the service owner has more control over the blast radius as well as the scope of the impact.</p></blockquote>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://githubengineering.com/moving-persistent-data-out-of-redis/" target="_blank">Moving persistent data out of Redis</a></div>
<div class="sreweekly-description">
<p>GitHub used a data-driven approach when migrating a storage load from Redis to MySQL. It&#8217;s a good thing they did, because a straight one-for-one translation would have overloaded MySQL.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://victorops.com/blog/actionable-alerts/" target="_blank">Actionable Alerts</a></div>
<div class="sreweekly-description">
<p>We&#8217;ve heard before that it&#8217;s important to make sure that your alerts are actionable. I like that this article goes into some detail on why we sometimes tend to create inactionable alerts before explaining how to improve your alerting.</p>
<p><small><em>This article is published by my sponsor, VictorOps, but their sponsorship did not influence its inclusion in this issue.</em></small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://blog.meteor.com/how-to-stop-ubuntu-xenial-from-randomly-killing-your-big-processes-4a3e2d09323f#.44zwekwch" target="_blank">How to stop Ubuntu Xenial from randomly killing your big processes</a></div>
<div class="sreweekly-description">
<p>Ubuntu backported a security fix into Xenial&#8217;s kernel last month, and unfortunately, they introduced a regression. Under certain circumstances, the kernel will give up way too easily when attempting to find memory to satisfy an allocation and will needlessly trigger the OOM killer. A fix was released on February 20th.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://ferd.ca/beating-the-cap-theorem-checklist.html" target="_blank">Beating the CAP Theorem Checklist</a></div>
<div class="sreweekly-description">
<p>Need to tell someone their <s>perpetual motion machine</s> CAP-satisfying system won&#8217;t work? Low on time? Use this handy checklist to explain why their idea won&#8217;t work.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://about.gitlab.com/2017/03/02/why-we-are-not-leaving-the-cloud/" target="_blank">Why we are not leaving the cloud</a></div>
<div class="sreweekly-description">
<p>GitLab seriously considered fleeing the cloud for a datacenter, and they asked the community for feedback. That feedback was very useful and was enough to change their minds. The common theme: &#8220;you are not an infrastructure company, so why try to be one?&#8221;</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://honeycomb.io/blog/2017/03/instrumenting-high-volume-services-part-2/" target="_blank">Instrumenting High Volume Services: Part 2</a></div>
<div class="sreweekly-description">
<p>If you&#8217;ve got a firehose of events going into your metrics/log aggregation system, you may need to reduce load on it by only sending in a portion of your events. Do you pick one out of every N? HoneyComb&#8217;s makers suggest an interesting alternative: tag each sampled event you send as representing N events from the source &#8212; and N is allowed to very between samples.</p>
</div>
</div>
<h2>Outages</h2>
<ul class="sreweekly-outages">
<li><a href="https://aws.amazon.com/message/41926/">Amazon S3</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">Amazon S3 in the us-east-1 region went down, taking many sites and services down with it, including <a href="http://www.trellostatus.com/incidents/7f1fhgrscbdh">Trello</a>, <a href="https://status.heroku.com/incidents/1059">Heroku,</a> portions of <a href="https://status.slack.com/2017-02/d6ecbc8f0763dd43">Slack</a> and <a href="https://status.github.com/messages">GitHub</a>, and tons more. Amazon&#8217;s <a href="https://status.aws.amazon.com/">status page</a> had a note at the top but was otherwise green across the board for hours.  Meanwhile nearly 100% of S3 requests failed and many other AWS services burned as well.Their outage summary (linked above) indicated that the outage uncovered a dependency of their status site on S3. Oops. Once they got that fixed a few hours later, they posted something I&#8217;ve never seen before: actual red icons.<small><em>Full disclosure: Heroku is my employer.</em></small></li>
</ul>
</li>
<li><a href="https://www.joyent.com/blog/manta-postmortem-7-27-2015">Joyent: Postmortem for July 27 outage of the Manta service</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">Here&#8217;s a deeply technical post-analysis of a Postgresql outage that Joyent experienced in 2015. A normally benign automatic maintenance (an auto-vacuum) turned into total DB lockup due to their workload.</li>
</ul>
</li>
<li><a href="https://status.pagerduty.com/incidents/70m30bh7qfmx">PagerDuty</a></li>
<li><a href="https://www.theregister.co.uk/2017/03/02/godaddy_dns_has_gone_diddy/">GoDaddy</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">DDoS attack on their nameservers.</li>
</ul>
</li>
</ul>
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