[8.15] Improve security-crypto threadpool overflow handling (#111369) #111564
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Prior to this PR, when the security-crypto threadpool queue overflows and rejects API key hashing submissions, a toxic value (specifically, a future which will never be completed) is added to the API key auth cache. This toxic cache value causes future authentication attempts with that API key to fail by timeout, because they will attempt to wait for the toxic future, until that value is invalidated and removed from the cache. Additionally, this will hold on to memory for each request that waits on the toxic future, even after the request has timed out. This PR adds a unit test to replicate this case, and adjusts the code which submits the key hashing task to the security-crypto threadpool to properly handle this point of failure by invalidating the cached future and notifying waiting handlers that the computation has failed.
gwbrown
added
:Security/Authentication
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Backports the following commits to 8.15: