what happens when APIM cache is full?

Question

When APIM cache is full , what happens to cache-store and cache-store-value policy ?
Do these policies fail or APIM will transparently purge the oldest cache entry to make room for the new entry?
Is there an official document which explains what the behavior would be?

Answer 1

As far as I understand, you are correct in your expectations . When the cache in Azure API Management (APIM) is full, the system will automatically evict the oldest cache entries to make room for new ones. This eviction is managed transparently by the APIM service, so your cache-store and cache-store-value policies do not fail due to a full cache. Instead, the cache continues to operate normally by purging older entries as needed to store new ones.

This behavior ensures that your caching strategy remains functional even when the cache reaches its maximum capacity, without causing failures or requiring manual intervention.

This behavior is typical for most caching systems - I'm not aware of any specific documentation that would explicitly describe this behavior.

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hth

Marcin