Improve threadpool usage and error handling for API key validation (#58090) #59047
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…lastic#58090) The PR introduces following two changes: Move API key validation into a new separate threadpool. The new threadpool is created separately with half of the available processors and 1000 in queue size. We could combine it with the existing TokenService's threadpool. Technically it is straightforward, but I am not sure whether it could be a rushed optimization since I am not clear about potential impact on the token service. On threadpoool saturation, it now fails with EsRejectedExecutionException which in turns gives back a 429, instead of 401 status code to users.
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The PR introduces following two changes:
Move API key validation into a new separate threadpool. The new threadpool is created separately with half of the available processors and 1000 in queue size. We could combine it with the existing TokenService's threadpool. Technically it is straightforward, but I am not sure whether it could be a rushed optimization since I am not clear about potential impact on the token service.
On threadpoool saturation, it now fails with EsRejectedExecutionException which in turns gives back a 429, instead of 401 status code to users.