We use UDP a lot. I mean, a whole lot. Sometimes it’s bare UDP within a site. Some of that is unicast and some is multicast. Sometimes it’s UDP with a bunch of

We use UDP a lot. I mean, a whole lot. Sometimes it’s bare UDP within a site. Some of that is unicast and some is multicast. Sometimes it’s UDP with a bunch of custom protocol logic around it between sites, handling buffering, reordering, retransmission, and more. I never said UDP wasn’t sometimes fit for purpose. I said it’s unreliable compared to TCP. Those are not the same statement. Sometimes reliability isn’t part of the spec, so you do without that or build your own reliability around it if the less reliable option is still a better fit. This is common in the industry, actually. The ‘I’ in RAID stands for inexpensive, because it’s a redundant array. We scale horizontally these days where we can because more cheaper servers can sometimes scale further and more reliably than fewer more premium servers. Heck, a paper cup is unreliable compared to ceramic or stainless steel, but Starbucks and Tim Horton’s move a lot of product in them.