Cache invalidation removes or marks cached data as unusable after the underlying data changes. section 16.2.2
In a blog-post creation workflow, invalidate the cache after creating the database record so later reads do not rely on changed data. This step belongs between database insertion and publishing the post link. section 16.2.2
A retry-safe blog-post operation proceeds in this order:
- Create the blog-post entry in the database. section 16.2.2
- Invalidate the cache because the data has changed. section 16.2.2
- Publish the blog link to the blog’s Twitter feed. section 16.2.2
