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measure(r276): ㄷ(자연키 PK) 비용 — 삽입·읽기 거의 무비용, 재구성 pt-osc 약 16분 · 네이티브 약 100분 (EC2) #851

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Merged
Khyojae merged 5 commits into from
Nov 11, 2026
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measure(r276): ㄷ(자연키 PK) 비용 — 삽입·읽기 거의 무비용, 재구성 pt-osc 약 16분 · 네이티브 약 100분 (EC2) #851

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5e2497b
measure(r276): ㄷ(자연키 PK) 비용 rig — ① 삽입 · ② PK 재구성 · ③ 읽기, EC2 2대 무인 라운드
Khyojae Nov 8, 2026
70f91cd
measure(r276): ㄷ 재측정 rig — 팔 N0(쓰기 없는 네이티브 DDL) · 온라인 DDL 로그 한도 · DDL…
Khyojae Nov 8, 2026
de7311c
measure(r276): 재측정 rig 스모크 모드 — 세션 200개 · N0·N·P 한 판씩 + ③ 작게
Khyojae Nov 8, 2026
407b189
measure(r276): ㄷ(자연키 PK) 비용 결과 — 삽입·읽기 거의 무비용, 재구성 pt-osc 약 16분 · 네이티…
Khyojae Nov 9, 2026
c720604
Merge remote-tracking branch 'origin/main' into measure/r276-natural-…
Khyojae Nov 9, 2026
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19 changes: 18 additions & 1 deletion docs/decisions/r276-lock-root-cause-fix.md
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# #276 근본 처방 — 재시도가 아니라 «중복 하나가 파티션 끝을 잠그는» 자리를 없앤다

작성: 2026-09-24
상태: **ㄴ(RC) 채택 · 적용 (2026-09-24 사용자 confirm)** — ㄷ(자연키 PK) 비용 측정 **착수·설계 확정(2026-11-08)**, rig 미작성 — §5
상태: **ㄴ(RC) 채택 · 적용 (2026-09-24 사용자 confirm)** — ㄷ(자연키 PK) 비용 **측정 완료(2026-11-09, EC2)** — §5-6. ㄴ 을 다시 열지는 미결
근거: [`loadtest/results/r276-lock-trace-2026-09-24/`](../../loadtest/results/r276-lock-trace-2026-09-24/README.md)
관련: [#276](https://github.com/Shadowfit/init/issues/276) · [`r276-retry-followup.md`](./r276-retry-followup.md) · [`pose-batch-idempotency-vs-partition.md`](./pose-batch-idempotency-vs-partition.md) · [`online-ddl-vs-blocking-alter.md`](./online-ddl-vs-blocking-alter.md)

Expand Down Expand Up @@ -129,6 +129,22 @@ RR 에서 **중복 키 한 건**이 `PRIMARY` 의 파티션 끝(supremum)에 `X`
3. **③ 을 이번에 같이 할지** — 추천: 같이(② 의 무대를 그대로 쓰면 추가 시딩이 없다)
4. **B′ 를 넣을지** — 추천: 넣는다(중복 인덱스 질문이 §2 ㄷ 표에 «검토 안 함» 으로 남아 있다)

### 5-6. 결과 (2026-11-09, EC2) — [`r276-natpk-aws-2026-11-08/`](../../loadtest/results/r276-natpk-aws-2026-11-08/README.md)

**상시 비용(삽입·읽기)은 거의 없거나 이득이고, 비용은 한 번 치르는 PK 재구성에 몰려 있다.**

| 단계 | 결과 |
|---|---|
| ① 삽입 | 4조건 중 3조건에서 B 가 **+15~22% 빠름**. 버퍼풀 초과 · 활성 675 에서만 B **−10%**(디스크 읽기 3.2배), B′ ±0. «행 전체가 흩어지면 크게 느려진다» 는 §5-2 가설은 120만~140만 행 무대에서 안 맞았다 |
| ② 재구성 (1,000만 행 · 약 21GB) | 서버가 INPLACE·LOCK=NONE 을 **받았다**. pt-osc **약 16분**(binlog +17GB) · 네이티브 INPLACE **약 100분**(binlog +0.85GB). 둘 다 쓰기 실패 0 · 최대 공백 1.2~1.35초. **네이티브는 기본 `innodb_online_alter_log_max_size`(128MiB)면 약 2시간 돌고 1799 로 매번 실패** — 2GiB 로 올려 통과(최소 필요값은 안 잼) |
| ③ 읽기 | 세션 단위 차이 없음(데움 p50 4.8~5.2ms). id 단건은 B 가 데움 +0.02~0.07ms |

§5 에 적은 것 중 틀린 것 둘:
- §5-4 «08-12 와 같은 시더·규모라 직접 비교된다» — **행 크기가 약 9배 다르다**(08-12 약 240B/행, 이번 2,119B/행). 시간을 나란히 놓으면 안 된다
- §5-3·§5-4 «A 는 `idx_session_timestamp` → PK 룩업» — 실제 계획은 **`uk_pose_event`** 를 탄다. `idx_session_timestamp` 는 A 에서도 이 조회에 안 쓰인다(B′ 에서 빼면 보조 인덱스 681→363MB)

§5-1 의 조건(«ㄷ 이 싸면 ㄴ 을 다시 연다»)이 걸린다. **다시 열지는 미결 — 사용자 결정.**

## 결정 로그

- 2026-09-24 — 문서 작성. 결정 없음
Expand All @@ -143,3 +159,4 @@ RR 에서 **중복 키 한 건**이 `PRIMARY` 의 파티션 끝(supremum)에 `X`
③ 같이 · B′ 넣음. 다음은 rig 작성 → 로컬 축소 스모크 → EC2 무인 라운드
- 2026-11-08 — **ㄴ 의 «모르는 것» 두 줄 닫음.** `findById` 등 같은 트랜잭션의 다른 문장은 코드 대조로 «보장 불변» 확인.
binlog 형식은 **기동 시 검사로 막기로 함 (사용자 confirm)** — `BinlogFormatStartupCheck` · 테스트 2벌(판정 · 실 MySQL 전제 1665)
- 2026-11-09 — **ㄷ 비용 측정 완료(EC2 3라운드).** 결과 §5-6. 결정 없음 — ㄴ 을 다시 열지는 사용자 confirm 대기
5 changes: 5 additions & 0 deletions loadtest/r276-natpk/_smoke/phase1/env.txt
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# start 2026-11-08 04:38:23
host_cpu= Intel(R) Core(TM) i3-6100 CPU @ 3.70GHz nproc=4
REGIMES=mem:256 ACTIVES=10 ARMS=A B Bp BLOCKS=2 TRIAL_ROWS=2000 WORKERS=15 SEED_SESSIONS=20
git=
mem mysql=8.0.46 pool=268435456
7 changes: 7 additions & 0 deletions loadtest/r276-natpk/_smoke/phase1/raw.tsv
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regime pool_mb active block arm rows_before rows sec rows_per_sec batch_p50_ms batch_p99_ms errors bp_reads bp_read_req page_splits data_len index_len bytes_per_row
mem 256 10 0 A 12000 2000 2.294 871.9 194.43 392.22 0 75 21347 277 27918336 2228224 2153.3
mem 256 10 0 B 12000 2000 2.506 798.2 230.85 343.5 0 19 19330 247 26918912 2228224 2081.9
mem 256 10 0 Bp 12000 2000 3.563 561.3 318.45 537.99 0 0 14944 239 26902528 1654784 2039.8
mem 256 10 1 B 14000 2000 3.935 508.3 297.54 1113.05 0 8 19553 240 31113216 3309568 2151.4
mem 256 10 1 Bp 14000 2000 3.245 616.4 283.91 577.93 0 2 14971 233 32145408 1654784 2112.5
mem 256 10 1 A 14000 2000 1.912 1046.0 154.73 378.14 0 29 20977 267 33161216 3309568 2279.4
11 changes: 11 additions & 0 deletions loadtest/r276-natpk/_smoke/phase1/run.log
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[phase1 04:37:59] 클라이언트 기동
[phase1 04:38:23] MySQL 기동 — 버퍼풀 256MB
[phase1 04:40:12] == 체제 mem(풀 256MB) · 활성 세션 10 — 팔 표 새로 깔기(세션 20 개)
[phase1 04:40:56] MySQL 기동 — 버퍼풀 256MB
[phase1 04:41:55] 블록 0(버림) 팔 A — 871.9 행/초 · p99 392.22ms · 디스크읽기 75 · 분할 277 · 오류 0
[phase1 04:42:06] 블록 0(버림) 팔 B — 798.2 행/초 · p99 343.5ms · 디스크읽기 19 · 분할 247 · 오류 0
[phase1 04:42:23] 블록 0(버림) 팔 Bp — 561.3 행/초 · p99 537.99ms · 디스크읽기 0 · 분할 239 · 오류 0
[phase1 04:42:39] 블록 1 팔 B — 508.3 행/초 · p99 1113.05ms · 디스크읽기 8 · 분할 240 · 오류 0
[phase1 04:42:55] 블록 1 팔 Bp — 616.4 행/초 · p99 577.93ms · 디스크읽기 2 · 분할 233 · 오류 0
[phase1 04:43:03] 블록 1 팔 A — 1046.0 행/초 · p99 378.14ms · 디스크읽기 29 · 분할 267 · 오류 0
[phase1 04:43:03] 완료 → /e/init-wt-natpk/loadtest/r276-natpk/_smoke/phase1/raw.tsv
3 changes: 3 additions & 0 deletions loadtest/r276-natpk/_smoke/phase1/seed.jsonl
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{"table": "t_A", "sessions": 20, "rows": 12000, "sec": 10.9}
{"table": "t_B", "sessions": 20, "rows": 12000, "sec": 8.7}
{"table": "t_Bp", "sessions": 20, "rows": 12000, "sec": 9.3}
6 changes: 6 additions & 0 deletions loadtest/r276-natpk/_smoke/phase1/trials.jsonl
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{"regime":"mem","active":10,"block":0,"arm":"A","insert":{"table": "t_A", "active": 10, "rows": 2000, "workers": 15, "sec": 2.294, "rows_per_sec": 871.9, "batch_p50_ms": 194.43, "batch_p99_ms": 392.22, "batches": 100, "errors": 0, "error_sample": [], "first_sid": 21, "last_sid": 30},"stats":{"table": "t_A", "rows": 14000, "data_length": 27918336, "index_length": 2228224, "bytes_per_row": 2153.3}}
{"regime":"mem","active":10,"block":0,"arm":"B","insert":{"table": "t_B", "active": 10, "rows": 2000, "workers": 15, "sec": 2.506, "rows_per_sec": 798.2, "batch_p50_ms": 230.85, "batch_p99_ms": 343.5, "batches": 100, "errors": 0, "error_sample": [], "first_sid": 21, "last_sid": 30},"stats":{"table": "t_B", "rows": 14000, "data_length": 26918912, "index_length": 2228224, "bytes_per_row": 2081.9}}
{"regime":"mem","active":10,"block":0,"arm":"Bp","insert":{"table": "t_Bp", "active": 10, "rows": 2000, "workers": 15, "sec": 3.563, "rows_per_sec": 561.3, "batch_p50_ms": 318.45, "batch_p99_ms": 537.99, "batches": 100, "errors": 0, "error_sample": [], "first_sid": 21, "last_sid": 30},"stats":{"table": "t_Bp", "rows": 14000, "data_length": 26902528, "index_length": 1654784, "bytes_per_row": 2039.8}}
{"regime":"mem","active":10,"block":1,"arm":"B","insert":{"table": "t_B", "active": 10, "rows": 2000, "workers": 15, "sec": 3.935, "rows_per_sec": 508.3, "batch_p50_ms": 297.54, "batch_p99_ms": 1113.05, "batches": 100, "errors": 0, "error_sample": [], "first_sid": 31, "last_sid": 40},"stats":{"table": "t_B", "rows": 16000, "data_length": 31113216, "index_length": 3309568, "bytes_per_row": 2151.4}}
{"regime":"mem","active":10,"block":1,"arm":"Bp","insert":{"table": "t_Bp", "active": 10, "rows": 2000, "workers": 15, "sec": 3.245, "rows_per_sec": 616.4, "batch_p50_ms": 283.91, "batch_p99_ms": 577.93, "batches": 100, "errors": 0, "error_sample": [], "first_sid": 31, "last_sid": 40},"stats":{"table": "t_Bp", "rows": 16000, "data_length": 32145408, "index_length": 1654784, "bytes_per_row": 2112.5}}
{"regime":"mem","active":10,"block":1,"arm":"A","insert":{"table": "t_A", "active": 10, "rows": 2000, "workers": 15, "sec": 1.912, "rows_per_sec": 1046.0, "batch_p50_ms": 154.73, "batch_p99_ms": 378.14, "batches": 100, "errors": 0, "error_sample": [], "first_sid": 31, "last_sid": 40},"stats":{"table": "t_A", "rows": 16000, "data_length": 33161216, "index_length": 3309568, "bytes_per_row": 2279.4}}
10 changes: 10 additions & 0 deletions loadtest/r276-natpk/_smoke/phase2.log
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[phase2 12:19:17] 기동 — 버퍼풀 512MB
[phase2 12:22:12] [0] tpl_A 시딩 — 세션 200 × 600 = 120000 행
{"table": "tpl_A", "sessions": 200, "rows": 120000, "sec": 127.3}
[phase2 12:24:27] [0] tpl_A 120000 행 · PK=id,created_at
[phase2 12:25:03] [1] ✅ 서버가 INPLACE·LOCK=NONE 을 받았다 — 팔 N 은 온라인 DDL 이다
[phase2 12:25:09] [2] 판 discard 팔 N — tpl_A 복사
[phase2 12:32:58] 팔 N — DDL 235.2초 · writer {"attempts": 633, "ok": 633, "errors": 0, "err_kinds": [], "max_attempt_ms": 21492, "p50_attempt_ms": 104.0, "max_gap_ms": 21700} · binlog +21MB · 디스크 최대 1622MB
[phase2 12:32:58] [2] 판 discard 팔 P — tpl_A 복사
[phase2 12:39:47] 팔 P — DDL 288.8초 · writer {"attempts": 440, "ok": 440, "errors": 0, "err_kinds": [], "max_attempt_ms": 4480, "p50_attempt_ms": 309.5, "max_gap_ms": 4684} · binlog +232MB · 디스크 최대 1604MB
[phase2 12:39:47] [2] 판 r1 팔 N — tpl_A 복사
1 change: 1 addition & 0 deletions loadtest/r276-natpk/_smoke/phase2/.disk_peak
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1626
32 changes: 32 additions & 0 deletions loadtest/r276-natpk/_smoke/phase2/discard_ddl.log
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No slaves found. See --recursion-method if host 2d1042f78d17 has slaves.
Not checking slave lag because no slaves were found and --check-slave-lag was not specified.
Operation, tries, wait:
analyze_table, 10, 1
copy_rows, 10, 0.25
create_triggers, 10, 1
drop_triggers, 10, 1
swap_tables, 10, 1
update_foreign_keys, 10, 1
Altering `natpk`.`t_rb`...
Creating new table...
Created new table natpk._t_rb_new OK.
Altering new table...
Altered `natpk`.`_t_rb_new` OK.
2026-11-08T03:35:01 Creating triggers...
2026-11-08T03:35:02 Created triggers OK.
2026-11-08T03:35:02 Copying approximately 102475 rows...
Copying `natpk`.`t_rb`: 30% 01:08 remain
Copying `natpk`.`t_rb`: 46% 01:09 remain
Copying `natpk`.`t_rb`: 57% 01:06 remain
Copying `natpk`.`t_rb`: 70% 00:50 remain
Copying `natpk`.`t_rb`: 80% 00:35 remain
Copying `natpk`.`t_rb`: 89% 00:20 remain
2026-11-08T03:39:27 Copied rows OK.
2026-11-08T03:39:27 Analyzing new table...
2026-11-08T03:39:28 Swapping tables...
2026-11-08T03:39:32 Swapped original and new tables OK.
2026-11-08T03:39:32 Dropping old table...
2026-11-08T03:39:34 Dropped old table `natpk`.`_t_rb_old` OK.
2026-11-08T03:39:34 Dropping triggers...
2026-11-08T03:39:34 Dropped triggers OK.
Successfully altered `natpk`.`t_rb`.
5 changes: 5 additions & 0 deletions loadtest/r276-natpk/_smoke/phase2/env.txt
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# start 2026-11-08 12:22:09
host_cpu= Intel(R) Core(TM) i3-6100 CPU @ 3.70GHz nproc=4
mysql=8.0.46 pool=536870912 ptosc=percona/percona-toolkit:3.6.0
SESSIONS=200 SEQ=discard:N discard:P r1:N r2:P GAP_MS=200 git=
native=ALGORITHM=INPLACE, LOCK=NONE probe_pk=session_id,rep_number,timestamp_sec,created_at
65 changes: 65 additions & 0 deletions loadtest/r276-natpk/_smoke/phase2/mysql_stderr.log
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mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
Empty file added loadtest/r276-natpk/_smoke/phase2/r1_ddl.log
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3 changes: 3 additions & 0 deletions loadtest/r276-natpk/_smoke/phase2/raw.tsv
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tag arm ddl_sec attempts ok errors max_attempt_ms max_gap_ms binlog_mb disk_peak_mb pk_after rows_after
discard N 235.2 633 633 0 21492 21700 22 1622 session_id,rep_number,timestamp_sec,created_at 132660
discard P 288.8 440 440 0 4480 4684 233 1604 session_id,rep_number,timestamp_sec,created_at 128800
9 changes: 9 additions & 0 deletions loadtest/r276-natpk/_smoke/phase2/run.log
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[phase2 12:19:17] 기동 — 버퍼풀 512MB
[phase2 12:22:12] [0] tpl_A 시딩 — 세션 200 × 600 = 120000 행
[phase2 12:24:27] [0] tpl_A 120000 행 · PK=id,created_at
[phase2 12:25:03] [1] ✅ 서버가 INPLACE·LOCK=NONE 을 받았다 — 팔 N 은 온라인 DDL 이다
[phase2 12:25:09] [2] 판 discard 팔 N — tpl_A 복사
[phase2 12:32:58] 팔 N — DDL 235.2초 · writer {"attempts": 633, "ok": 633, "errors": 0, "err_kinds": [], "max_attempt_ms": 21492, "p50_attempt_ms": 104.0, "max_gap_ms": 21700} · binlog +21MB · 디스크 최대 1622MB
[phase2 12:32:58] [2] 판 discard 팔 P — tpl_A 복사
[phase2 12:39:47] 팔 P — DDL 288.8초 · writer {"attempts": 440, "ok": 440, "errors": 0, "err_kinds": [], "max_attempt_ms": 4480, "p50_attempt_ms": 309.5, "max_gap_ms": 4684} · binlog +232MB · 디스크 최대 1604MB
[phase2 12:39:47] [2] 판 r1 팔 N — tpl_A 복사
1 change: 1 addition & 0 deletions loadtest/r276-natpk/_smoke/phase2/seed.jsonl
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{"table": "tpl_A", "sessions": 200, "rows": 120000, "sec": 127.3}
1 change: 1 addition & 0 deletions loadtest/r276-natpk/_smoke/phase2/stats.jsonl
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{"table": "tpl_A", "rows": 120000, "data_length": 246333440, "index_length": 9601024, "bytes_per_row": 2132.8}
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