A cache miss is a situation where a request for data is made to a distributed cache, but the data is not found in the cache. 

This can happen for a variety of reasons, such as if the data has not been stored in the cache, or if it has been evicted from the cache due to space limitations.

 When a cache miss occurs, the data must be fetched from the original source, which can slow down the performance of the system. 

https://www.geeksforgeeks.org/types-of-cache-misses/