![]() ![]() There is also curiosity about unanswered questions. On average 67 per cent of pull requests were actually merged into the code. ![]() Builds take around 3.5 minutes, and the average time from a pull request (when new code is merged) to running it in production was one day and 23 minutes, in this particular month. The WebCore platform uses CI/CD to enable rapid iteration, and Clark showed an example monthly report showing 110 releases or around three per day. ![]() Clark didn't say much about how the content itself is stored, though he promised to return to this topic in future posts. Content is provided to the web rendering layer via a REST API, and a solution called Fast Agnostic Business Layer "allows different teams to create their own business logic," he said, so that different requirements are met while still sharing the same system for things like access control and caching. He added that Lambda scales better than VMs on the AWS Elastic Compute Cloud (EC2), saying that "our traffic levels can rocket in an instant Lambda can handle this in a way that EC2 auto-scaling cannot."Īnother aspect of the BBC site is the logic that goes into requesting content, which Clark calls the "business layer". "About 2,000 lambdas run every second to create the BBC website a number that we expect to grow," said Clark. In the BBC's case, Lambda is used, which is able to auto-scale on demand. our numbers showed better engagement from the customer with rendering early," though he noted increased server load as a major disadvantage. Walmart engineer Alex Grigoryan, who also oversaw a migration to SSR, tested SSR vs client-side rendering (CSR) and said: "When we did A/B tests on SSR vs CSR. Server-side rendering means the browser gets a page ready to view without having to do a lot of work, and thus it should appear instantly, though it increases the burden on the server – caching mitigates this, we note. A second layer on AWS handles caching and routing, before hitting functions running on AWS Lambda, which perform server-side rendering (SSR) of dynamic content using React, a JavaScript framework. GTM handles "tens of thousands of requests a second," said Clark. Web traffic initially hits a Global Traffic Manager (GTM), an in-house solution based on the Nginx web server and running partly on-premises (showing that the BBC has not entirely ditched its data centres) and partly on AWS. ![]()
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