eCommerce in the Cloud by Kelly Goetsch

Author:Kelly Goetsch
Language: eng
Format: epub, mobi, pdf
ISBN: 9781491946633
Publisher: O’Reilly Media, Inc.
Published: 2014-10-26T16:00:00+00:00

For more information on this topic, read The Art of Scalability by Martin L. Abbott and Michael T. Fisher (Addison-Wesley Professional).

Technical Rules

Convert synchronous to asynchronous

In synchronous processing, the execution of one task (e.g., an application server generating an HTTP response) is dependent upon the execution of one or more other tasks (e.g., querying a database). A common example of this is an email confirmation being sent synchronously following an order submission. Assuming transactions are being properly used, the successful placing of an order is entirely dependent upon something as frivolous as an SMTP server’s availability and performance. With proper decoupling of these two systems, an order would be placed as normal, but instead of synchronously sending the message, it would be dumped in a queue and delivered asynchronously to an available SMTP server.

Synchronous calls to any system put it in the critical path, making the entire system’s scalability dependent upon the least scalable resource. For example, your order management system may struggle to handle traffic from your busiest days of the year. If you’re connecting synchronously to your order management system, the scalability of your entire platform will be dependent upon the scalability of that one system. In an omnichannel world, where all channels use the same backend systems, some of your systems will not be able to scale. Any activity that’s not directly tied to generating revenue or doesn’t require an instantaneous response should be performed asynchronously so it doesn’t interfere with generating revenue.

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