What is Cashew?
What is Varnish?
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When you visit the site, you talk to a load balancer which chooses a varnish front-end which in turn talks to our web front-ends which used to run nine python processes. Each of these processes are serving the exact same version on any given web front-end.
Varnish sits as a secondary cache layer behind Akamai. Two servers operate in a Primary/Secondary configuration with failover managed by HAProxy. Requests peak at around 10k/s.
Varnish is the http cache proxy we use to achieve maximum performance on high traffic e-commerce.