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Add Asynchronism intro section

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Donne Martin 2017-03-01 20:40:25 -08:00
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@ -1397,3 +1397,13 @@ Refresh-ahead can result in reduced latency vs read-through if the cache can acc
* [Scalability](http://www.lecloud.net/post/9246290032/scalability-for-dummies-part-3-cache)
* [AWS ElastiCache strategies](http://docs.aws.amazon.com/AmazonElastiCache/latest/UserGuide/Strategies.html)
* [Wikipedia](https://en.wikipedia.org/wiki/Cache_(computing))
## Asynchronism
<p align="center">
<img src="http://i.imgur.com/54GYsSx.png">
<br/>
<i><a href=http://lethain.com/introduction-to-architecting-systems-for-scale/#platform_layer>Source: Intro to architecting systems for scale</a></i>
</p>
Asynchronous workflows help reduce request times for expensive operations that would otherwise be performed in-line. They can also help by doing time-consuming work in advance, such as periodic aggregation of data.