ktmud edited a comment on pull request #18181:
URL: https://github.com/apache/superset/pull/18181#issuecomment-1028425816
@michael-s-molina Thanks for working on this!
I noticed that when I open an Explore page, the URL will update with a new
form data key every time I reload the page even when the form data isn't
updated. Based on the PR summary, it seems this is by design, but I'm concerned
this may not be scalable in high-traffic Superset deployments:
1. If the cache is configured as FileSystemCache:
1. In case `CACHE_THRESHOLD` is not set or is 0, this could quickly fill
up disk space or degrade performance as number of files in the cache directory
increases.
2. In case `CACHE_THRESHOLD` is not zero, this could exhaust the allowed
number of cache keys too fast, making it more likely that a link you shared to
someone a while ago becomes invalid.
3. It may be less of a concern if we configure the cache in Redis, but it's
still not ideal (the cache keys still exhaust quicker than necessary if we
configure Redis as [LRU cache](https://redis.io/topics/lru-cache), or require
too much storage if we do not).
If the concern was that people opening the same key may accidentally
override each other's explore state, how about we create a new key only when
the cached data's `owner` is different than current user? The new key could be
based on current key + current user id so it's always deterministic even when
users open other people's shared URL multiple times.
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