# Complete - m-large-payload-followup-optimization/04_ws_fixed_latency

## 완료 일시

2026-06-14

## 요약

WS fixed latency path 분석/완화 작업 1회 리뷰 루프를 PASS로 종료했다. TypeScript TCP/custom WS와 Kotlin OkHttp WS client에 no-delay를 명시하고, stress stderr diagnostic으로 fixed latency row를 추적 가능하게 했다.

## 루프 이력

| Plan | Review | Verdict | 메모 |
|------|--------|---------|------|
| `plan_cloud_G07_0.log` | `code_review_cloud_G07_0.log` | PASS | no-delay 적용 후 TypeScript WS gateway off/on p50이 약 41ms에서 1-2ms대로 내려갔고, stability hard gate가 유지됐다. |

## 구현/정리 내용

- TypeScript `TcpClient`, custom `NodeWebSocket`, `NodeWsServer` upgrade socket에 TCP no-delay 설정을 추가했다.
- Kotlin OkHttp WS client용 `NoDelaySocketFactory`를 추가해 plain WS/WSS client socket에 `tcpNoDelay`를 적용했다.
- TypeScript/Kotlin stress `emitRow`에 stdout `ROW|` 계약을 유지한 채 stderr `DIAG fixed-latency` diagnostic을 추가했다.
- TypeScript `NodeWebSocket` 생성 시 `setNoDelay(true)` 호출을 fake socket unit test로 검증했다.
- worker_threads gateway p99 tail은 no-delay와 별도인 잔여 후보로 기록했다.

## 최종 검증

- `cd typescript && npm run check` - PASS; `tsc --noEmit` exit 0.
- `cd typescript && npm test -- test/tcp.test.ts test/ws.test.ts` - PASS; 2 files, 19 tests passed.
- `cd typescript && npm test` - PASS; 5 files, 63 tests passed.
- `cd kotlin && ./gradlew --offline test --tests com.tokilabs.proto_socket.WsTest` - PASS; `BUILD SUCCESSFUL`.
- `cd kotlin && ./gradlew test` - PASS; `BUILD SUCCESSFUL`.
- `bash agent-ops/skills/project/run-proto-socket-test-matrix/scripts/run_stress.sh --quick --lang typescript,kotlin --transport ws --profile roundtrip` - PASS; result record `agent-test/runs/20260614-110207-proto-socket-stress-quick.md`.
- `bash agent-ops/skills/project/run-proto-socket-test-matrix/scripts/run_stress.sh --quick --lang typescript --transport ws --profile gateway` - PASS; result record `agent-test/runs/20260614-110215-proto-socket-stress-quick.md`.

## Roadmap Completion

- Milestone: `agent-roadmap/milestones/large-payload-followup-optimization.md`
- Completed task ids:
  - `ws-fixed-latency-path`: PASS; evidence=`agent-task/archive/2026/06/m-large-payload-followup-optimization/04_ws_fixed_latency/plan_cloud_G07_0.log`, `agent-task/archive/2026/06/m-large-payload-followup-optimization/04_ws_fixed_latency/code_review_cloud_G07_0.log`; verification=`agent-test/runs/20260614-110207-proto-socket-stress-quick.md`, `agent-test/runs/20260614-110215-proto-socket-stress-quick.md`
- Not completed task ids: 없음

## 잔여 Nit

- 없음

## 후속 작업

- 없음
