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e4a279db13
## Problem We are currently supporting two read paths. No bueno. ## Summary of changes High level: use vectored read path to serve get page requests - gated by `get_impl` config Low level: 1. Add ps config, `get_impl` to specify which read path to use when serving get page requests 2. Fix base cached image handling for the vectored read path. This was subtly broken: previously we would not mark keys that went past their cached lsn as complete. This is a self standing change which could be its own PR, but I've included it here because writing separate tests for it is tricky. 3. Fork get page to use either the legacy or vectored implementation 4. Validate the use of vectored read path when serving get page requests against the legacy implementation. Controlled by `validate_vectored_get` ps config. 5. Use the vectored read path to serve get page requests in tests (with validation). ## Note Since the vectored read path does not go through the page cache to read buffers, this change also amounts to a removal of the buffer page cache. Materialized page cache is still used.