Razvan Stanga

Imagine a high traffic website that needs post views as an algorithm to display posts on the homepage. 
This website also uses <a href="https://wordpress.org/plugins/vcaching/" rel="ugc">Varnish Caching</a>. So we need an AJAX based post views counter. 
Now imagine a minimum 5000 concurrent users browsing the website, so we can’t use the default “AJAX in Plugins” as live updates on the backend using update_post_meta will be very painful for the backend.
So what can we do ?
What if all these post views counts will be done in memory using Redis ? 
Then we run a cornjob using WP-CLI to sync the post views count in Redis to the WordPress database.
Redis Post Views was born.

Redis Post Views

Highly optimized post views counter using Redis

Gennady Kovshenin

Pressjitsu

A Redis-backed full page caching plugin for WordPress, extremely flexible and fast. Requires a running <a href="http://redis.io/" rel="nofollow ugc">Redis server</a> and the <a href="https://github.com/phpredis/phpredis" rel="nofollow ugc">PHP Redis PECL</a> extension.
<h4>Features</h4>
<ul>
<li>Serves full cached pages from memory</li>
<li>Caches redirects, 404s and other response codes</li>
<li>Just-in-time cache expiry/regeneration</li>
<li>Cache status headers for monitoring hit rate</li>
<li>Smart and flexible cache invalidation</li>
<li>Serves stale cache during regeneration</li>
<li>Configurable list of ignored cookies and request variables</li>
</ul>
For an installation and configuration guide please visit the <a href="https://github.com/pressjitsu/pj-page-cache-red" rel="nofollow ugc">full documentation on GitHub</a>. If you need any assistance please reach out to <a href="https://pressjitsu.com" rel="nofollow ugc">Pressjitsu</a> via live chat or e-mail, or open a new thread in the WordPress.org support forums.

Redis Page Cache

A Redis-backed full page caching plugin for WordPress, extremely flexible and fast.

Redis Post Views vs Redis Page Cache