Part 2 – Auto-scaling and elastic load balancing in the cloud
In Part 1 I looked at the front-end (presentation layer) high availability cache (Varnish) that helps us deliver web pages quickly from a cache (memory). However, there are situations when there are a large number of queries also reaching our back-end, as Varnish hasn’t or can’t cache those queries – during adverse weather or industrial action, when our website traffic can spike at up to 20x usual volumes for example.
Events such as adverse weather or industrial action can lead to huge spikes in web traffic
Part 1 – High availability cache
This is the first of a two-part blog, giving an introduction to the high availability cache at the front-end of the website.
The new responsive TfL Website is not just a mobile make-over, it has been re-developed from the ground up. The site is a fundamentally brand-new, structurally re-designed, responsive website for the modern needs of the travelling public in London.
Varnish is a web accelerator which allows our website to sustain very high traffic and load many times faster by caching static & dynamic content.