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index.html
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<title>reveal.js</title>
<link rel="stylesheet" href="css/reveal.css">
<link rel="stylesheet" href="css/theme/white.css">
<!-- Theme used for syntax highlighting of code -->
<link rel="stylesheet" href="lib/css/zenburn.css">
<!-- Printing and PDF exports -->
<script>
var link = document.createElement( 'link' );
link.rel = 'stylesheet';
link.type = 'text/css';
link.href = window.location.search.match( /print-pdf/gi ) ? 'css/print/pdf.css' : 'css/print/paper.css';
document.getElementsByTagName( 'head' )[0].appendChild( link );
</script>
</head>
<body>
<div style="position: absolute; width: 100%; height: 100%; z-index: 0; display: flex; flex-direction: column">
<div style="display:flex; flex-direction: row-reverse; justify-content: center; ">
<div style="width: 95%; display:flex; flex-direction: row-reverse">
<img style="width: 60%; height: 100%; padding: 10px" src="img/LOGO_DS_grey.svg"/>
</div>
</div>
<div style="flex-grow:1"></div>
<div style="display: flex; flex-direction: row; justify-content: center"><div style="height: 2px; width: 95%; background: #00b0e0"></div></div>
<div style="display: flex; flex-direction: row; height: 117px; justify-content: center; align-items: center">
<div style="width: 95%;">
<img STYLE="width: 180px; padding-bottom: 10px" src="img/LOGO_DS_color.svg"/>
</div>
</div>
</div>
<div class="reveal">
<div class="slides">
<section>
<section>
<h1>Events on Acid</h1>
<h3>Data consistency in the world of microservices</h3>
<p>Przemysław Pawelec</p>
<p>Scalar</p>
</section>
<section>
<h2>Disclaimer 1</h2>
<p>We are not going to get full ACID</p>
</section>
<section>
<h2>Disclaimer 2</h2>
<p>One might not need this machinery</p>
</section>
<section>
<p>Statistics gathering</p>
<p>vs</p>
<p>Servicing users</p>
</section>
</section>
<section>
<section>
<h1>Problem</h1>
</section>
<section>
<h2>Data Inconsistency</h2>
</section>
<section>
<img style="width: 68%; height: 68%" src="img/inconsistency.svg"/>
</section>
<section>
<h2>Extendable Synchronous API</h2>
</section>
<section>
<img style="width: 68%; height: 68%" src="img/simple_process.svg"/>
</section>
<section>
<img style="width: 68%; height: 68%" src="img/extended_process.svg"/>
</section>
</section>
<section>
<section>
<h1>Solution</h1>
<h3>Transaction over transactions</h3>
</section>
<section>
<h2>Requirements</h2>
<p class="fragment">Rollbacks</p>
<p class="fragment">Easy commits</p>
</section>
<section>
<img width="50%" height="50%" src="img/transaction_manager_introduces.svg"/>
</section>
<section>
<h2>Configuration</h2>
<p>Transaction manager needs a list of events in a process</p>
<p>Each service has its own documentation of events - e.g roots, responses</p>
<p>One can put them together to obtain the graphs of the processes</p>
</section>
<section>
<h2>Happy path</h2>
<ul>
<li class="fragment">Services work as usual</li>
<li class="fragment">Transaction Manager waits for all events from a process to appear</li>
<li class="fragment">Sends meta event: Commit</li>
<li class="fragment">The process is finished</li>
</ul>
</section>
<section>
<h2>Unfortunate accident</h2>
<ul>
<li class="fragment">A service encounters an error</li>
<li class="fragment">It broadcasts a meta event: Rollback</li>
<li class="fragment">Other participants scrap their work</li>
<li class="fragment">The process never existed</li>
</ul>
</section>
<section>
<h2>Timeouts</h2>
<p>No sign of life cause Transaction Manager to send Rollback</p>
</section>
</section>
<section>
<section>
<h1>Benefits</h1>
</section>
<section>
<h2>Common with Sagas</h2>
<ul>
<li>Consistency</li>
<li>Synchronous API</li>
<li>Distributed validation</li>
</ul>
</section>
<section>
<h2>Over Sagas</h2>
<ul>
<li>Extendable - we can add to a process without writing a code in Transaction Manager</li>
<li>Modular - we can choose a subset of our services without writing any code</li>
<li>Dynamic - we can do the above without recompiling anything</li>
</ul>
</section>
</section>
<section>
<section>
<h1>Philosophy</h1>
</section>
<section>
<img style="width: 68%; height: 68%" src="img/central_saga.svg"/>
</section>
<section>
<img style="width: 68%; height: 68%" src="img/delegated_tm.svg"/>
</section>
<section>
<p>Saga pattern is a micromonolith</p>
</section>
<section>
<h2>Expressive power</h2>
</section>
</section>
<section>
<h1>Fin</h1>
</section>
</div>
</div>
<script src="lib/js/head.min.js"></script>
<script src="js/reveal.js"></script>
<script>
// More info about config & dependencies:
// - https://github.com/hakimel/reveal.js#configuration
// - https://github.com/hakimel/reveal.js#dependencies
Reveal.initialize({
dependencies: [
{ src: 'plugin/markdown/marked.js' },
{ src: 'plugin/markdown/markdown.js' },
{ src: 'plugin/notes/notes.js', async: true },
{ src: 'plugin/highlight/highlight.js', async: true, callback: function() { hljs.initHighlightingOnLoad(); } }
]
});
</script>
</body>
</html>