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authorLoïc Hoguin <[email protected]>2017-10-03 13:39:41 +0200
committerLoïc Hoguin <[email protected]>2017-10-03 13:39:41 +0200
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@@ -7,7 +7,7 @@
<meta name="description" content="">
<meta name="author" content="Loïc Hoguin based on a design from (Soft10) Pol Cámara">
- <meta name="generator" content="Hugo 0.17" />
+ <meta name="generator" content="Hugo 0.26" />
<title>Nine Nines: Don&#39;t let it crash</title>
@@ -74,118 +74,118 @@
</p>
</header>
-<div class="paragraph"><p>We have a specific mindset when writing Erlang
-programs. We focus on the normal execution of the
-program and don&#8217;t handle most of the errors that may
-occur. We sometimes call this normal execution the
-<em>happy path</em>.</p></div>
-<div class="paragraph"><p>The general pattern behind writing only for the
-<em>happy path</em>, letting the VM catch errors (writing
-them to a log for future consumption) and then
-having a supervisor restart the processes that
-failed from a clean state, has a name. We call it
-<em>let it crash</em>; and it drives many of our design
-decisions.</p></div>
-<div class="paragraph"><p>It&#8217;s a really great way to program and the results
-are fantastic compared to most other programming
-languages. And yet, <em>let it crash</em> barely convinced
-anyone that they should use Erlang. Why would that
-be?</p></div>
-<div class="paragraph"><p>You may already know that Cowboy is capable of
-handling at least 2 million Websocket connections
-on a single server. This is in large part thanks
-to the capabilities of the VM. Still, 2 million
-is good, much better than most other servers can
-do.</p></div>
-<div class="paragraph"><p>Cowboy is not just a Websocket server; it&#8217;s also
-an HTTP and HTTP/2 server, and it handles many
-related features like long polling or the parsing
-of most request headers.</p></div>
-<div class="paragraph"><p>Can you guess how large the Cowboy codebase is,
-without looking at the source?</p></div>
-<div class="paragraph"><p>Do make sure you have a clear answer in your mind
-before you go check.</p></div>
-<div class="paragraph"><p>Good, you are back. Now what were the results? If
-I am correct, you overestimated the size of Cowboy.
-Cowboy is in fact about five thousand lines of code.
-You probably thought it was at least ten thousand.
-About eighty percent of readers will have
-overestimated the size of Cowboy. And you did only
-because I mentioned it can handle millions of
-Websocket connections.</p></div>
-<div class="paragraph"><p>Numerous studies show this effect. Just mentioning
-the large number already prepared your mind to think
-in that direction. Repeating the number made you
-focus even more on it. Then the question asked for
-a number, which ended up larger than the reality.</p></div>
-<div class="paragraph"><p>The same effect can be applied to negotiation for
-example. You generally want to start by giving your
-offer (and not let the other party initiate) and
-you want to give a really large number first. You
-can also prepare your customer by mentioning an even
-larger number in the previous discussion.</p></div>
-<div class="paragraph"><p>And it&#8217;s not just numbers either. An experiment
-showed that just by looking at an image of clouds,
-customers of a pillow store were buying pillows
-more comfortable (and more expensive) than those
-who didn&#8217;t see that image.</p></div>
-<div class="paragraph"><p>This is the power of associations. It is covered in
-much larger detail in the books
-<a href="https://www.amazon.com/Influence-Psychology-Persuasion-Robert-Cialdini/dp/006124189X">Influence</a>
-and
-<a href="https://www.amazon.com/Pre-Suasion-Revolutionary-Way-Influence-Persuade/dp/1501109790">Pre-suasion</a>.
-I highly recommend reading those and applying what
-you learn to your daily life. I&#8217;m definitely not
-a professional psychologist so take this post with
-a grain of salt.</p></div>
-<div class="paragraph"><p>When selling Erlang, whether we are selling it to
-a customer or trying to convince a developer friend
-to start using it, we often talk about how Erlang
-<em>lets you sleep at night</em>, that it is auto healing
-and always gets fantastic uptimes.</p></div>
-<div class="paragraph"><p>And then we talk about <em>let it crash</em>.</p></div>
-<div class="paragraph"><p>And we describe what it means.</p></div>
-<div class="paragraph"><p>We might as well just say that Erlang crashes a lot
-and then take the door. It would have the same effect.
-It doesn&#8217;t even stop at programs crashing. You know
-what else crashes? Cars, planes, trains. Often with
-disastrous consequences. Is that really the message
-we want to convey?</p></div>
-<div class="paragraph"><p>They even <a href="https://img.youtube.com/vi/oEUBW2lCkIk/0.jpg">printed it on a t-shirt</a>!
-Keep calm and let it crash. It&#8217;s the kind of t-shirt
-you probably shouldn&#8217;t wear in an airport, and for good
-reasons. A few people did, then realized what they were
-wearing and were not too smug about it.</p></div>
-<div class="paragraph"><p>And yet this is how we sell Erlang.</p></div>
-<div class="paragraph"><p>A better way would be to focus on the positives, of
-course, but also to make sure that those positives
-are phrased in a way that prevents bad associations
-to be formed in people&#8217;s minds.</p></div>
-<div class="paragraph"><p>Instead of <em>let it crash</em>, you can say that Erlang
-has <em>auto healing mechanisms</em>. Healing is a good
-thing and accurately describes what happens in the
-system.</p></div>
-<div class="paragraph"><p>Should you need to go into more details, you will
-probably want to avoid <em>recover from crashes</em> and
-instead say <em>recover from exceptions</em>. Exceptions
-are a pretty neutral word and, should you explain
-what you mean by that, you can talk about exceptions
-that occur for reasons unrelated to Erlang, like
-hardware failure or network instability.</p></div>
-<div class="paragraph"><p>The trick is to always use positive words and
-phrases to describe Erlang, and to use external
-factors to explain how Erlang deals with failures.
-Never mention the failures internal to Erlang
-systems unless you are asked specifically, in
-which case you can say that the auto healing
-applies to all exceptions.</p></div>
-<div class="paragraph"><p>The <em>let it crash</em> philosophy is great when
-learning Erlang or when writing fault-tolerant
-systems. But it&#8217;s not going to convince anyone
-to use it unless they were already looking for
-it.</p></div>
-<div class="paragraph"><p>Do you like this post? Tell me on Twitter. I might
-make more.</p></div>
+<div class="paragraph"><p>We have a specific mindset when writing Erlang
+programs. We focus on the normal execution of the
+program and don&#8217;t handle most of the errors that may
+occur. We sometimes call this normal execution the
+<em>happy path</em>.</p></div>
+<div class="paragraph"><p>The general pattern behind writing only for the
+<em>happy path</em>, letting the VM catch errors (writing
+them to a log for future consumption) and then
+having a supervisor restart the processes that
+failed from a clean state, has a name. We call it
+<em>let it crash</em>; and it drives many of our design
+decisions.</p></div>
+<div class="paragraph"><p>It&#8217;s a really great way to program and the results
+are fantastic compared to most other programming
+languages. And yet, <em>let it crash</em> barely convinced
+anyone that they should use Erlang. Why would that
+be?</p></div>
+<div class="paragraph"><p>You may already know that Cowboy is capable of
+handling at least 2 million Websocket connections
+on a single server. This is in large part thanks
+to the capabilities of the VM. Still, 2 million
+is good, much better than most other servers can
+do.</p></div>
+<div class="paragraph"><p>Cowboy is not just a Websocket server; it&#8217;s also
+an HTTP and HTTP/2 server, and it handles many
+related features like long polling or the parsing
+of most request headers.</p></div>
+<div class="paragraph"><p>Can you guess how large the Cowboy codebase is,
+without looking at the source?</p></div>
+<div class="paragraph"><p>Do make sure you have a clear answer in your mind
+before you go check.</p></div>
+<div class="paragraph"><p>Good, you are back. Now what were the results? If
+I am correct, you overestimated the size of Cowboy.
+Cowboy is in fact about five thousand lines of code.
+You probably thought it was at least ten thousand.
+About eighty percent of readers will have
+overestimated the size of Cowboy. And you did only
+because I mentioned it can handle millions of
+Websocket connections.</p></div>
+<div class="paragraph"><p>Numerous studies show this effect. Just mentioning
+the large number already prepared your mind to think
+in that direction. Repeating the number made you
+focus even more on it. Then the question asked for
+a number, which ended up larger than the reality.</p></div>
+<div class="paragraph"><p>The same effect can be applied to negotiation for
+example. You generally want to start by giving your
+offer (and not let the other party initiate) and
+you want to give a really large number first. You
+can also prepare your customer by mentioning an even
+larger number in the previous discussion.</p></div>
+<div class="paragraph"><p>And it&#8217;s not just numbers either. An experiment
+showed that just by looking at an image of clouds,
+customers of a pillow store were buying pillows
+more comfortable (and more expensive) than those
+who didn&#8217;t see that image.</p></div>
+<div class="paragraph"><p>This is the power of associations. It is covered in
+much larger detail in the books
+<a href="https://www.amazon.com/Influence-Psychology-Persuasion-Robert-Cialdini/dp/006124189X">Influence</a>
+and
+<a href="https://www.amazon.com/Pre-Suasion-Revolutionary-Way-Influence-Persuade/dp/1501109790">Pre-suasion</a>.
+I highly recommend reading those and applying what
+you learn to your daily life. I&#8217;m definitely not
+a professional psychologist so take this post with
+a grain of salt.</p></div>
+<div class="paragraph"><p>When selling Erlang, whether we are selling it to
+a customer or trying to convince a developer friend
+to start using it, we often talk about how Erlang
+<em>lets you sleep at night</em>, that it is auto healing
+and always gets fantastic uptimes.</p></div>
+<div class="paragraph"><p>And then we talk about <em>let it crash</em>.</p></div>
+<div class="paragraph"><p>And we describe what it means.</p></div>
+<div class="paragraph"><p>We might as well just say that Erlang crashes a lot
+and then take the door. It would have the same effect.
+It doesn&#8217;t even stop at programs crashing. You know
+what else crashes? Cars, planes, trains. Often with
+disastrous consequences. Is that really the message
+we want to convey?</p></div>
+<div class="paragraph"><p>They even <a href="https://img.youtube.com/vi/oEUBW2lCkIk/0.jpg">printed it on a t-shirt</a>!
+Keep calm and let it crash. It&#8217;s the kind of t-shirt
+you probably shouldn&#8217;t wear in an airport, and for good
+reasons. A few people did, then realized what they were
+wearing and were not too smug about it.</p></div>
+<div class="paragraph"><p>And yet this is how we sell Erlang.</p></div>
+<div class="paragraph"><p>A better way would be to focus on the positives, of
+course, but also to make sure that those positives
+are phrased in a way that prevents bad associations
+to be formed in people&#8217;s minds.</p></div>
+<div class="paragraph"><p>Instead of <em>let it crash</em>, you can say that Erlang
+has <em>auto healing mechanisms</em>. Healing is a good
+thing and accurately describes what happens in the
+system.</p></div>
+<div class="paragraph"><p>Should you need to go into more details, you will
+probably want to avoid <em>recover from crashes</em> and
+instead say <em>recover from exceptions</em>. Exceptions
+are a pretty neutral word and, should you explain
+what you mean by that, you can talk about exceptions
+that occur for reasons unrelated to Erlang, like
+hardware failure or network instability.</p></div>
+<div class="paragraph"><p>The trick is to always use positive words and
+phrases to describe Erlang, and to use external
+factors to explain how Erlang deals with failures.
+Never mention the failures internal to Erlang
+systems unless you are asked specifically, in
+which case you can say that the auto healing
+applies to all exceptions.</p></div>
+<div class="paragraph"><p>The <em>let it crash</em> philosophy is great when
+learning Erlang or when writing fault-tolerant
+systems. But it&#8217;s not going to convince anyone
+to use it unless they were already looking for
+it.</p></div>
+<div class="paragraph"><p>Do you like this post? Tell me on Twitter. I might
+make more.</p></div>
</article>
</div>
@@ -194,55 +194,107 @@ make more.</p></div>
<h3>More articles</h3>
<ul id="articles-nav" class="extra_margin">
- <li><a href="https://ninenines.eu/articles/cowboy-2.0.0-rc.2/">Cowboy 2.0 release candidate 2</a></li>
+
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+
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+
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+
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+
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+
+ <li><a href="https://ninenines.eu/articles/ml-archives/">Mailing list archived</a></li>
+
- <li><a href="https://ninenines.eu/articles/website-update/">Website update</a></li>
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