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houseme
6886dca7d1
backlog#1183, staged rollout step. Simplify enabling the zero-duplex GET
codec-streaming fast path to a single switch — RUSTFS_GET_CODEC_STREAMING_ROLLOUT
(default "off") — now that body/header parity is proven (parity e2e net + bench
A/B on backlog#1183).
- Add a clean production rollout token "on" (aliases "full"/"production"); the
legacy "internal"/"benchmark" tokens remain accepted.
- Flip DEFAULT_RUSTFS_GET_CODEC_STREAMING_ENABLE and the two ..._COMPAT_CONFIRMED
defaults to true. They are retained as emergency kill-switches (set any to
false to force the fast path off) but no longer gate enablement — the rollout
switch does.
No production behavior change: with no env set the rollout switch defaults to
"off", so GET stays on the legacy duplex path exactly as before. Flipping the
hard default to on is deferred to a follow-up after a production soak.
Note (intentional semantics change): with the rollout switch opted in
("on"/"internal"/"benchmark"), codec streaming now activates without also
setting the two ..._COMPAT_CONFIRMED vars — compatibility is confirmed, so those
confirmations are baked in.
Co-authored-by: heihutu <heihutu@gmail.com>