July 2017
Beginner to intermediate
358 pages
10h 54m
English
Content preview from Building Microservices with Go
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Stale cache in times of database or downstream service failure
The cache will normally have an end date on it. However, if you implement the cache in a way that the code decides to invalidate it, then you can potentially avoid problems if a downstream service or database disappears. Again, this is back to thinking about failure states and asking what is better: the user seeing slightly out-of-date information or an error page? If your cache has expired, the call to the downstream service fails. However, you can always decide to serve the stale cache back to the calling client. In some instances, this will be better than returning a 50x error.
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