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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-71/">SRE Weekly Issue #71</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-71/">May 7, 2017</a>
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<a href="https://sreweekly.com/sre-weekly-issue-71/" title="Permalink to SRE Weekly Issue #71" class="email_only">View on sreweekly.com</a>
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<h2 style="text-align: center; font-size: 55%; color: #b0b0b0;">SPONSOR MESSAGE</h2>
<p>Resolving DevOps and IT incidents is not enough. Download the eBook: “Blameless Post Mortems (and how to do them)”, and start learning from them. <a href="http://try.victorops.com/BlamelessPostMortems/SREWeekly">http://try.victorops.com/BlamelessPostMortems/SREWeekly</a></p>
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<h2>Articles</h2>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://thoughts.t37.net/how-we-upgraded-a-22tb-mysql-cluster-from-5-6-to-5-7-in-9-months-b09211af57ba" target="_blank">How we Upgraded a 22TB MySQL Cluster from 5.6 to 5.7 (in 9 months)</a></div>
<div class="sreweekly-description">
<p>The interesting bit in this story is that upgrading to 5.7 requires a full table rewrite (&lt;tt&gt;ALTER TABLE&lt;/tt&gt;) for any table that has time-related columns. Their initial test-run took <i>months</i> and still hadn&#8217;t finished.</p>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://medium.com/adstage-engineering/migrating-from-heroku-to-aws-our-story-80084d31025e?__s=gcxkayouhzyr45m1hboa" target="_blank">Migrating from Heroku to AWS: Our Story</a></div>
<div class="sreweekly-description">
<p>AdStage made the move from Heroku to running their service directly on EC2, and in this article they explain why and how.</p>
<blockquote><p>We were officially only getting about 2 ECUs per dyno, but the reality was that we were getting something closer to 6 since our neighbors on Heroku were not using their full share. This meant that our fleet of AWS instances was 3 times too small, [&#8230;]</p></blockquote>
<p><small><em>Language Warning: contains the word &#8220;sexy&#8221; used to describe new or interesting technology.</em></small></p>
<p><small><em>Full disclosure: Heroku, my employer, is mentioned.</em></small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://blog.gremlininc.com/the-discipline-of-chaos-engineering-e39d2383c459" target="_blank">The Discipline of Chaos Engineering</a></div>
<div class="sreweekly-description">
<p>I&#8217;ve featured many articles from Mathias Lafeldt as part of his series, <a href="https://tinyletter.com/production-ready">Production Ready</a>. Now that he&#8217;s moved to <a href="https://www.gremlininc.com/">Gremlin Inc</a> (a SaaS helping customers run chaos experiments), Mathias reintroduces the history and theory of Chaos Engineering.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://feedproxy.google.com/~r/HighScalability/~3/XrwZuZ560tk/homegrown-master-master-replication-for-a-nosql-database.html" target="_blank">Homegrown master-master replication for a NoSQL database</a></div>
<div class="sreweekly-description">
<p>The folks behind Mail.ru implemented their own master-master replication system on top of <a href="https://tarantool.org/">Tarantool</a>, a DBMS I&#8217;d never heard of. Their implementation is based on some details of their use-case that may not apply more broadly, but the design discussion is interesting nonetheless.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://code.facebook.com/posts/1290069194423954/onlineschemachange-rebuilt-in-python/" target="_blank">OnlineSchemaChange rebuilt in Python</a></div>
<div class="sreweekly-description">
<p>Facebook rewrote their tool, OnlineSchemaChange in Python (from the original PHP). OSC is a tool for doing DDL in MySQL without downtime.</p>
<blockquote><p>The original open sourced OSC was more like an engine than a tool. Users needed to write PHP code wrapping to run the schema change, and, with PHP becoming less popular in the operations world, OSC.php wasn’t widely adopted by the community.</p></blockquote>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.pagerduty.com/blog/learn-from-incident-management-data/" target="_blank">After the Disaster: How to Learn from Historical Incident Management Data</a></div>
<div class="sreweekly-description">
<p>From PagerDuty, an article on the incident management data to gather, how to gather it, and how to analyze it.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://dzone.com/articles/what-is-structured-logging" target="_blank">What is Structured Logging?</a></div>
<div class="sreweekly-description">
<p>A basic introduction to structured logging, including rationale on why you&#8217;d want to use it. With infrastructures growing more and more complicated, I find structured logging indispensable in keeping everything up and running and debugging difficult problems.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://code.facebook.com/posts/1782709872057497/building-express-backbone-facebook-s-new-long-haul-network/" target="_blank">Building Express Backbone: Facebook’s new long-haul network</a></div>
<div class="sreweekly-description">
<p>For the network nerds, Facebook details their new inter-datacenter network topology.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.elastic.co/blog/introducing-machine-learning-for-the-elastic-stack" target="_blank">Introducing Machine Learning for the Elastic Stack</a></div>
<div class="sreweekly-description">
<p>New in the latest version of Elastic Stack (think ElasticSearch, Logstash, Kibana, etc) is built-in anomaly detection using machine learning, based on technology from Prelert (<a href="http://info.prelert.com/elastic-acquires-behavioral-analytics-leader-prelert">acquired</a> by Elastic in 2016). &#8220;Machine Learning&#8221; &#8212; they might as well say it&#8217;s powered by &#8220;Lasers™&#8221;. If you try this out and have any success, please write up your results and send me a link!</p>
</div>
</div>
<h2>Outages</h2>
<ul class="sreweekly-outages">
<li><a href="https://motherboard.vice.com/en_us/article/whatsapp-is-down">WhatsApp</a></li>
<li><a href="http://www.wlky.com/article/network-outage-delays-racing-at-churchill-downs/9607493">Churchill Downs</a></li>
<li><a href="http://www.mirror.co.uk/tech/mumsnet-down-popular-parenting-website-10354233">Mumsnet</a></li>
<li><a href="https://www.cloudflarestatus.com/incidents/51q3xhq8w7t8">Cloudflare Status &#8211; Network Performance Issues in multiple locations</a></li>
<li><a href="https://www.theregister.co.uk/2017/05/02/telia_hiccups_cloudflare_falls_over/">Telia</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">Telia, a major backbone internet provider, deployed a misconfiguration that caused routing issues across the globe. <a href="https://www.cloudflarestatus.com/incidents/51q3xhq8w7t8">CloudFlare</a> noticed, as did <a href="http://status.pingdom.com/incidents/0n95zvcxb19m">Pingdom</a> and <a href="https://discord.statuspage.io/incidents/4xb7y2hrlp8v">Discord</a>. Think back to almost a year ago, and you may remember that <a href="https://www.theregister.co.uk/2016/06/20/telia_engineer_blamed_massive_net_outage/">this isn&#8217;t the first time</a> that they&#8217;ve caused this kind of far-reaching problem.</li>
</ul>
</li>
</ul>
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