13 Matching Annotations
  1. Feb 2021
    1. So the hard and unsolvable problem becomes: how up-to-date do you really need to be?
    2. After considering the value we place, and the tradeoffs we make, when it comes to knowing anything of significance, I think it becomes much easier to understand why cache invalidation is one of the hard problems in computer science

      the crux of the problem is: trade-offs

    3. The non-determinism is why cache invalidation — and that other hard problem, naming things — are uniquely and intractably hard problems in computer science. Computers can perfectly solve deterministic problems. But they can’t predict when to invalidate a cache because, ultimately, we, the humans who design and build computational processes, can’t agree on when a cache needs to be invalidated.
    4. Cache invalidation is hard because: Everything in life we want to know, changes.Those changes are non-deterministic.
    5. Sometimes humorously extended as “cache invalidation, naming things, and off-by-one errors.”
    1. There’s only one hard thing in Computer Science: human communication. The most complex part of cache invalidation is figuring out what the heck people mean with the word cache. Once you get that sorted out, the rest is not that complicated; the tools are out there, and they’re pretty good.
    1. One reason Turbolinks sites seem faster than traditional web apps is because of its cache. However, the cache can be a source of great frustration. Many of the edge cases we're going to discuss involve the cache in some way.