[openstreetmap/openstreetmap-website] Consequences of using the cache (Issue #6989)

[Tom Hughes]

tomhughes left a comment (openstreetmap/openstreetmap-website#6989)

I'm not familiar with the details of what the other PR was proposing to cache but in general if the cached data changes then the key should change so that invalidation is automatic - at least that is how I understood rails caching to work?

There is no eviction as such, unused data just moves to the back of the LRU list and is evicted when space is needed for a new entry. That's why I don't understand that other ticket because all our statistics say that it takes weeks for that to happen.

I think the issue with the database was just the churn from storing session records and the inefficiency of constant reads and writes for ever single page load.

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