Some years ago, I was working as the front-end developer at an e-commerce service company, providing smaller online retailers with recommendation services. The way it worked was that we loaded, on each client page, a JS config file containing client-specific customizations, a platform-specific library, and a file containing the core functionality. This also predated JS build tools as a real Thing, so we had to load each file separately rather than a single bundle.
Well, one day I was asked to add a certain feature for a particular client; this was a simple thing, just converting a piece of data from some computer-readable form to something more human-friendly, so I just put the function in the platform file and put the lookup table it referenced in the core, so it'd be available to other platforms if they needed it. It all worked fine, so I uploaded it to our CDN and waited for the change to propagate out.
A few days later I got a call about our code breaking a client's site. Apparently the new platform file had propagated out, but the core file hadn't, so when my new function went looking for its lookup table, it couldn't find it and broke the website of actually our largest client.
TLDR: I lost our largest client and almost my job because I didn't really know how CDNs worked.
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Some years ago, I was working as the front-end developer at an e-commerce service company, providing smaller online retailers with recommendation services. The way it worked was that we loaded, on each client page, a JS config file containing client-specific customizations, a platform-specific library, and a file containing the core functionality. This also predated JS build tools as a real Thing, so we had to load each file separately rather than a single bundle.
Well, one day I was asked to add a certain feature for a particular client; this was a simple thing, just converting a piece of data from some computer-readable form to something more human-friendly, so I just put the function in the platform file and put the lookup table it referenced in the core, so it'd be available to other platforms if they needed it. It all worked fine, so I uploaded it to our CDN and waited for the change to propagate out.
A few days later I got a call about our code breaking a client's site. Apparently the new platform file had propagated out, but the core file hadn't, so when my new function went looking for its lookup table, it couldn't find it and broke the website of actually our largest client.
TLDR: I lost our largest client and almost my job because I didn't really know how CDNs worked.