9c795bd838
When a cache entry expires, it remains in the cache (both the segment that it belongs to, and the LRU list) until an eviction occurs. The problem here is that the compute if absent implementation relies on there not being an association to a key that we are trying to put because it internally uses put if absent on the underlying segment. If we try to put an association for a key that has expired but not been evicted, then compute if absent will return as if there is nothing in the cache for the given key, yet no call to compute if absent will succeed in putting a new association for the key. To remedy this, we modify the internal get method for the cache to let the caller take action if the entry they are retrieving is expired. This allows the compute if absent method to take the action of evicting the entry from the cache, thus allowing the put if absent method used by compute if absent to succeed for one of the callers trying to compute if absent a new association. Relates #26516 |
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