graceguo-supercat edited a comment on pull request #10963:
URL: 
https://github.com/apache/incubator-superset/pull/10963#issuecomment-698061914


   This PR will only focus on dashboard's cache stale logic. i do not want to 
change current slice cache behavior.
   
   #2
   if chart **was not modified for ~10 hours**, this means slice entity are not 
modified, like query parameters, datasource used, it doesn't mean the query 
results is not modified. For dashboard requests, it only need slice parameters 
but not query results. Front-end js will use slice parameters to build query, 
plus dashboard filters.
   
   #3:
   annotations: dashboard has no annotation. If slice's annotation was changed, 
its `params` and `changed_on` attribute will be changed.
   changed to the default filters, css rules, etc: these change will affect 
dashboard metadata, and will change changed_on field.


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