yeah, the way it works (now) is as an LRU cache; warms it up on load and then it writes every X seconds dirty entries.

While the cache is warming up this adapter is non-locking, meaning that if you try to fetch something it will hit relays at the same time until it finishes warming up and then it hits the cache synchronously
 

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 I would love to discuss more about the design choices of NDK in the future.