villebro commented on a change in pull request #18976:
URL: https://github.com/apache/superset/pull/18976#discussion_r817887532



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File path: UPDATING.md
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@@ -26,6 +26,7 @@ assists people when migrating to a new version.
 
 ### Breaking Changes
 
+- [18976](https://github.com/apache/superset/pull/18976): When running the app 
in debug mode, the app will default to use `SimpleCache` for 
`FILTER_STATE_CACHE_CONFIG` and `EXPLORE_FORM_DATA_CACHE_CONFIG`. When running 
in non-debug mode, a cache backend will need to be defined, otherwise the 
application will fail to start. For installations using Redis or other caching 
backends, it is recommended to use the same backend for both cache configs.

Review comment:
       @ktmud I think the jury is still out on a few aspects of this feature:
   - will people predominantly use direct URLs or permalinks for sharing
   - what's the sweet spot timeout for these caches
   - will we ever need multiple key-value states on a resource, or can we just 
collapse them into one key-value pair per resource
   
   etc. I'm happy to keep iterating on this, and when we do a 3.0 release, I 
think it would be a perfect time to clean up some of the cruft we've 
accumulated here.




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