ktmud commented on a change in pull request #18976:
URL: https://github.com/apache/superset/pull/18976#discussion_r817873193



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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:
       > For installations using Redis or other caching backends, it is 
recommended to use the same backend for both cache configs.
   
   I'm wondering if there is a real need in configuring different cache 
expiration for both cache storages? If not, maybe we should just merge 
them---into something like `SEMI_PERSISTENT_CACHE_CONFIG` (albeit it'd be a 
bigger breaking change)?  
   




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