Suggested usage subject to Cache Stampede
Description
Environment
Activity
Sean Corfield November 1, 2019 at 4:51 PM
Released/addressed in 0.8.0 through 0.8.2 (0.8.0 and 0.8.1 both had bugs in the wrapped API that are fixed in 0.8.2).
Sean Corfield August 24, 2019 at 10:34 PM
Addition of clojure.core.cache.wrapped with comparable API plus lookup-or-miss to provide stampede-free version of this functionality for caches wrapped in atoms.
Sean Corfield October 3, 2018 at 6:56 AM
The local delay version would look like this:
Sean Corfield September 22, 2018 at 7:41 PM
It took me a while to find this suggested usage – https://github.com/clojure/core.cache/wiki/Using
I should update that to use through-cache which is more idiomatic now:
It would still suffer from the same possibility of Cache Stampede but at least it would be consistent with the newer API.
I suspect using a local delay would mitigate the stampede issue but it would make for very ugly code and it would not play well with through-cache – so I'll have to give that some thought.
Details
Details
Assignee
Sean CorfieldReporter
importPriority
Major
I've been trying to wrap my head around core.cache, and it seems to me that the suggest use in the documentation, i.e.
will result in a Cache Stampede since
(retrieve-data key)might be called multiple times ifswap!retries due to compare-and-swap misses. Unfortunately I don't have a suggestion on how this could be fixed.