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refactor: 문서 개선 중

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donghyeon-ka
2026-09-21 14:30:55 +09:00
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commit 805a18f486
1497 changed files with 525837 additions and 59152 deletions
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docs/keycloak-session-store/final/assets/a3-commit-to-disk-gap/a3-commit-to-disk-gap.alt.md
+7 -7
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@@ -10,13 +10,13 @@ Keycloak 은 트랜잭션마다 SET LOCAL synchronous_commit TO OFF 를 건다.
## Elements and evidence
- **클라이언트** (actor): 200 과 토큰을 받는다. Evidence: L207–L213.
- **Keycloak** (service): 트랜잭션마다 synchronous_commit 을 끈다. Evidence: L211–L215.
- **PostgreSQL** (datastore): COMMIT 을 즉시 반환한다. WAL 은 아직 메모리에 있다. Evidence: L211–L215.
- **디스크의 WAL** (datastore): 여기 닿아야 살아남는다. Evidence: L207–L215.
- **클라이언트** (actor): 200 과 토큰을 받는다. Evidence: L513–L518.
- **Keycloak** (service): 트랜잭션마다 synchronous_commit 을 끈다. Evidence: L516–L518.
- **PostgreSQL** (datastore): COMMIT 을 즉시 반환한다. WAL 은 아직 메모리에 있다. Evidence: L516–L518.
- **디스크의 WAL** (datastore): 여기 닿아야 살아남는다. Evidence: L513–L518.
## Relationships
- **클라이언트 → Keycloak:** 로그인 요청. Evidence: L207–L211.
- **Keycloak → PostgreSQL:** 세션 INSERT · COMMIT. Evidence: L211–L215.
- **PostgreSQL → 디스크의 WAL:** 지연된 WAL 기록. Evidence: L211–L215.
- **클라이언트 → Keycloak:** 로그인 요청. Evidence: L513–L516.
- **Keycloak → PostgreSQL:** 세션 INSERT · COMMIT. Evidence: L516–L518.
- **PostgreSQL → 디스크의 WAL:** 지연된 WAL 기록. Evidence: L516–L518.
docs/keycloak-session-store/final/assets/a3-commit-to-disk-gap/a3-commit-to-disk-gap.drawio
+12 -12
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docs/keycloak-session-store/final/assets/a3-commit-to-disk-gap/a3-commit-to-disk-gap.excalidraw
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docs/keycloak-session-store/final/assets/a3-commit-to-disk-gap/a3-commit-to-disk-gap.manifest.json
+4 -4
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@@ -21,7 +21,7 @@
"a3-commit-to-disk-gap.excalidraw",
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docs/keycloak-session-store/final/assets/a3-commit-to-disk-gap/a3-commit-to-disk-gap.svg
+26 -26
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@@ -1,8 +1,8 @@
<?xml version="1.0" encoding="UTF-8"?>
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<svg xmlns="http://www.w3.org/2000/svg" width="680" height="1358" viewBox="0 0 680 1358" role="img" aria-labelledby="diagram-title diagram-description">
<title id="diagram-title">200 과 디스크 사이의 빈 구간</title>
<desc id="diagram-description">Keycloak 은 트랜잭션마다 SET LOCAL synchronous_commit TO OFF 를 건다. PostgreSQL 은 COMMIT 을 WAL 디스크 기록을 기다리지 않고 즉시 반환하고, 클라이언트는 200 과 토큰을 받는다. 실측된 wal_writer_delay 는 200ms 이며 그 사이에 프로세스가 죽으면 그만큼이 사라진다. 153건 중 4건이 그렇게 유실됐다. 버그가 아니라 의도된 설계이고 그 대가를 숫자로 확인한 것이다.</desc>
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<text class="node-label" x="209.5" y="137.0">클라이언트</text>
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<text class="node-label" x="110.0" y="222.0">클라이언트</text>
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<text class="node-label" x="209.5" y="267.0">Keycloak</text>
<line class="node-detail-divider" x1="84.0" y1="288.0" x2="335.0" y2="288.0" />
<text class="node-detail" x="86.0" y="305.0">SET LOCAL synchronous_commit TO OFF</text>
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<text class="node-label" x="181.0" y="482.0">Keycloak</text>
<line class="node-detail-divider" x1="55.5" y1="503.0" x2="306.5" y2="503.0" />
<text class="node-detail" x="57.5" y="520.0">SET LOCAL synchronous_commit TO OFF</text>
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<rect class="node-shape kind-datastore emphasis-warning role-control" data-evidence="211-215" x="115.5" y="420.0" width="188.0" height="71.0" /><ellipse class="node-shape kind-datastore emphasis-warning role-control" cx="209.5" cy="420.0" rx="94.0" ry="13.0" /><path class="storage-bottom" d="M 115.5 491.0 A 94.0 13.0 0 0 0 303.5 491.0" />
<text class="node-label" x="209.5" y="447.0">PostgreSQL</text>
<line class="node-detail-divider" x1="129.5" y1="468.0" x2="289.5" y2="468.0" />
<text class="node-detail" x="131.5" y="485.0">wal_writer_delay 200ms</text>
<rect class="node-shape kind-datastore emphasis-warning role-control" data-evidence="516-518" x="41.5" y="905.8" width="188.0" height="47.3" /><ellipse class="node-shape kind-datastore emphasis-warning role-control" cx="135.5" cy="905.8" rx="94.0" ry="11.8" /><path class="storage-bottom" d="M 41.5 953.2 A 94.0 11.8 0 0 0 229.5 953.2" />
<text class="node-label" x="135.5" y="921.0">PostgreSQL</text>
<line class="node-detail-divider" x1="55.5" y1="942.0" x2="215.5" y2="942.0" />
<text class="node-detail" x="57.5" y="959.0">wal_writer_delay 200ms</text>
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<rect class="node-shape kind-datastore emphasis-primary role-target" data-evidence="207-215" x="134.5" y="613.0" width="150.0" height="71.0" /><ellipse class="node-shape kind-datastore emphasis-primary role-target" cx="209.5" cy="613.0" rx="75.0" ry="13.0" /><path class="storage-bottom" d="M 134.5 684.0 A 75.0 13.0 0 0 0 284.5 684.0" />
<text class="node-label" x="209.5" y="640.0">디스크의 WAL</text>
<line class="node-detail-divider" x1="148.5" y1="661.0" x2="270.5" y2="661.0" />
<text class="node-detail" x="150.5" y="678.0">DB 존재 149건</text>
<rect class="node-shape kind-datastore emphasis-primary role-target" data-evidence="513-518" x="41.5" y="1253.8" width="150.0" height="47.3" /><ellipse class="node-shape kind-datastore emphasis-primary role-target" cx="116.5" cy="1253.8" rx="75.0" ry="11.8" /><path class="storage-bottom" d="M 41.5 1301.2 A 75.0 11.8 0 0 0 191.5 1301.2" />
<text class="node-label" x="116.5" y="1269.0">디스크의 WAL</text>
<line class="node-detail-divider" x1="55.5" y1="1290.0" x2="177.5" y2="1290.0" />
<text class="node-detail" x="57.5" y="1307.0">DB 존재 149건</text>
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