chore: 문서를 작성할 때 한국어의 표현 작성 스킬 추가 및 1인칭 관점의 글 작성 검증 테스트 추가

2026-07-29 16:48:03 +09:00
parent c39406bbdd
commit 41501b5d06
520 changed files with 95494 additions and 2231 deletions
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+# assets — 발표 슬라이드용 스크린샷
+
+[../n+1liner.md](../n+1liner.md)는 실측 수치·실행계획을 텍스트로 담아 그대로 렌더된다. 슬라이드에서 화면 캡처로 보여주고 싶을 때 아래를 여기에 저장한다.
+
+| 파일명 | 캡처 대상 |
+|---|---|
+| `feed-nplus1-sql-log.png` | 피드 조회 시 highlights 조회가 아이템마다 반복되는 SQL 로그 |
+| `curve-console.png` | `=== L1 N=10/100/1000 ... collectionFetches=10/100/1000 ...` 곡선 콘솔 |
+| `explain-highlights-index-scan.png` | 반복되는 하이라이트 조회 EXPLAIN(`Index Scan ... Execution Time 0.173ms`) |
+| `explain-feed-items-seqscan.png` | 목록 쿼리 EXPLAIN(정렬키 인덱스 없어 Seq Scan + Sort) |
+
+콘솔·실행계획 원문은 `./gradlew :app-bootstrap:test --tests '*FeedPersistenceIT*'` 실행 후 `src/app-bootstrap/build/test-results/test/TEST-*FeedPersistenceIT*.xml`의 system-out에서 뽑을 수 있다.
@@ -0,0 +1,38 @@
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+        <mxCell id="n_users" value="users" tooltip="entity | Evidence: L35-L35" style="whiteSpace=wrap;html=1;rounded=1;strokeWidth=2;fontSize=14;fontStyle=1;fillColor=#ffffff;strokeColor=#2d4357;verticalAlign=middle;" vertex="1" parent="1">
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+        </mxCell>
+        <mxCell id="n_pages" value="pages" tooltip="entity | Evidence: L36-L36" style="whiteSpace=wrap;html=1;rounded=1;strokeWidth=2;fontSize=14;fontStyle=1;fillColor=#ffffff;strokeColor=#2d4357;verticalAlign=middle;" vertex="1" parent="1">
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+        <mxCell id="n_feed-items" value="feed_items" tooltip="entity | Evidence: L35-L35" style="whiteSpace=wrap;html=1;rounded=1;strokeWidth=2;fontSize=14;fontStyle=1;fillColor=#ffffff;strokeColor=#2d4357;verticalAlign=middle;" vertex="1" parent="1">
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+        <mxCell id="n_highlights" value="highlights" tooltip="entity | Evidence: L37-L37" style="whiteSpace=wrap;html=1;rounded=1;strokeWidth=2;fontSize=14;fontStyle=1;fillColor=#ffffff;strokeColor=#2d4357;verticalAlign=middle;" vertex="1" parent="1">
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+      </root>
+    </mxGraphModel>
+  </diagram>
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+<svg xmlns="http://www.w3.org/2000/svg" width="885" height="305" viewBox="0 0 885 305" role="img" aria-labelledby="diagram-title diagram-description">
+<title id="diagram-title">기준선 스키마의 관계</title>
+<desc id="diagram-description">왼쪽의 users와 pages가 각각 중앙의 feed_items에 연결된다. feed_items는 오른쪽의 highlights로 이어진다. 간선은 user와 page 각각에 여러 feed_item이 연결되고, 한 feed_item에 여러 highlight가 연결되는 관계를 나타낸다.</desc>
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+<text class="edge-label" x="610.0" y="133.0">여러 highlights를 가짐</text>
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+<text class="node-label" x="145.0" y="90.0">users</text>
+</g>
+<g id="node-pages">
+<rect class="node-shape kind-entity emphasis-normal role-source" data-evidence="36-36" x="70.0" y="196.0" width="150.0" height="64.0" rx="7" />
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+        <mxCell id="n_postgresql" value="PostgreSQL" tooltip="Hibernate가 루트 및 연관 SELECT를 실행하는 데이터베이스. | Evidence: L417-L422, L447-L447" style="whiteSpace=wrap;html=1;rounded=1;strokeWidth=2;fontSize=14;fontStyle=1;fillColor=#ffffff;strokeColor=#2d4357;verticalAlign=middle;shape=cylinder3;boundedLbl=1;backgroundOutline=1;fillColor=#eef6fb;" vertex="1" parent="1">
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+<svg xmlns="http://www.w3.org/2000/svg" width="680" height="542" viewBox="0 0 680 542" role="img" aria-labelledby="diagram-title diagram-description">
+<title id="diagram-title">EAGER 2차 조회는 반환 전에, LAZY highlights 조회는 매핑 접근 뒤에 실행된다</title>
+<desc id="diagram-description">세 참가자를 왼쪽부터 loadFeed DTO 매핑, Hibernate, PostgreSQL 순으로 읽는다. loadFeed가 findAllBy 파생 쿼리를 호출하면 Hibernate가 PostgreSQL에서 feed_items를 먼저 조회한다. 이어 fetch join되지 않은 EAGER user와 page를 별도의 2차 SELECT로 채우고, 반환 시점까지 로딩된 FeedItem을 loadFeed에 돌려준다. 이후 DTO 매핑이 getHighlights()에 접근하면 Hibernate가 해당 아이템의 highlights 컬렉션 SELECT를 실행한다.</desc>
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+<text class="node-label" x="120.0" y="65.0">loadFeed DTO 매핑</text>
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+<text class="edge-label" x="225.0" y="129.0">1. findAllBy(...)</text>
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+<text class="edge-label" x="435.0" y="191.0">2. SELECT feed_items</text>
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+<text class="edge-label" x="435.0" y="253.0">3. SELECT user / page · EAGER 2차</text>
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+<text class="edge-label" x="225.0" y="315.0">4. EAGER 연관이 채워진 FeedItem 반환</text>
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+<text class="edge-label" x="225.0" y="377.0">5. 매핑 중 getHighlights() 접근</text>
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+<text class="edge-label" x="435.0" y="439.0">6. SELECT highlights WHERE feed_item_id = ?</text>
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+<title id="diagram-title">반환 부모 수 N이 컬렉션 초기화와 자식 SELECT 횟수를 결정한다</title>
+<desc id="diagram-description">왼쪽의 loadFeed 요청은 한 페이지에서 N개의 FeedItem을 반환한다. 매핑이 각 부모의 Highlight 컬렉션에 접근하면 컬렉션 초기화가 부모마다 한 번씩 일어나 총 N회가 된다. 현재 기준선에서는 배치나 서브셀렉트가 없어 초기화 한 번마다 Highlight SELECT도 한 번 실행되므로 추가 조회가 N회 발생한다. 각 SELECT는 해당 부모의 Highlight 자식 행을 전부 읽는다.</desc>
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+<title id="diagram-title">조회 전략은 FeedQueryPort 뒤의 퍼시스턴스 어댑터에 격리된다</title>
+<desc id="diagram-description">왼쪽의 FeedController가 GET /feed 요청을 받아 중앙의 GetFeedUseCase에 조회를 위임한다. 유스케이스는 오른쪽의 FeedQueryPort에 조회를 의존한다. FeedQueryAdapter는 FeedQueryPort를 구현하는 아웃바운드 어댑터이며 PostgreSQL 조회를 수행한다. Fetch Join, Batch Fetch, DTO Projection, 윈도우 함수 같은 구체 전략은 이 어댑터의 책임이므로 상위 계층은 전략 교체의 영향을 받지 않는다.</desc>
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+<title id="diagram-title">Zipf-like 분포만 무거운 머리와 긴 꼬리를 함께 재현한다</title>
+<desc id="diagram-description">왼쪽부터 균일분포, 정규분포, Zipf-like 합성 분포를 같은 네 기준으로 비교한다. 균일분포는 모든 아이템이 3개이고, 정규분포는 평균 근처에 몰려 둘 다 극단적으로 많은 소수를 만들지 못하므로 제외된다. Zipf-like 분포는 소수의 인기 아이템이 압도적인 무거운 머리와 나머지의 긴 꼬리를 만들며, 지수 s=1.15와 상한 500·하한 1을 사용해 매우 많은 하이라이트 조건과 Top-N 필요성을 재현하는 합성 스트레스 분포로 선택된다.</desc>
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+<title id="diagram-title">두 형제 문제는 Fetch Join에서 합류한 뒤 단계별 해법으로 최종 구조가 된다</title>
+<desc id="diagram-description">왼쪽에서 과제 요구사항, 도메인·데이터 모델, 최초 피드 조회 기준선 순으로 시작한다. 기준선에서 컬렉션 N+1(N1)과 User·Page 연관의 숨은 쿼리(N2)가 서로 앞뒤가 아닌 형제 문제로 동시에 갈라지고, 두 경로는 Fetch Join 시도에서 합류한다. 이 시도는 다중 컬렉션·페이징 실패로 이어진다. 마지막 노드는 Batch Fetch, DTO Projection, 아이템별 Top-3, Keyset Pagination, 가시성 조건 인덱싱을 거쳐 최종 피드 조회 구조에 도달하는 순서를 담는다.</desc>
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+<desc id="diagram-description">왼쪽의 users와 pages가 중앙의 feed_items에 연결된다. 오른쪽에는 highlights와 feed_item_mentions가 놓인다. feed_items는 두 엔티티에 각각 연결되고, 기존 users도 mentioned 사용자 역할로 feed_item_mentions에 연결된다.</desc>
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+<rect class="edge-label-bg" x="570.5" y="184.5" width="131.9" height="22" rx="3" />
+<text class="edge-label" x="636.5" y="199.5">여러 highlights를 가짐</text>
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+<text class="edge-label" x="634.0" y="127.0">피드 아이템을 연결</text>
+<polyline class="edge kind-relationship style-solid emphasis-normal" points="220.0,228.0 300.0,228.0 300.0,169.0 380.0,169.0" data-evidence="36-36" />
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+<text class="edge-label" x="324.0" y="199.5">여러 feed_item이 딸림</text>
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+<text class="edge-label" x="324.0" y="127.0">여러 feed_item을 가짐</text>
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+<text class="edge-label" x="455.0" y="56.0">mentioned 사용자로 연결</text>
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+<text class="node-label" x="145.0" y="90.0">users</text>
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+<g id="node-pages">
+<rect class="node-shape kind-entity emphasis-normal role-source" data-evidence="36-36" x="70.0" y="196.0" width="150.0" height="64.0" rx="7" />
+<text class="node-label" x="145.0" y="226.0">pages</text>
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+<rect class="node-shape kind-entity emphasis-normal role-store" data-evidence="35-35" x="380.0" y="128.0" width="150.0" height="64.0" rx="7" />
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+<g id="node-feed-item-mentions">
+<rect class="node-shape kind-entity emphasis-normal role-sink" data-evidence="43-43" x="690.0" y="60.0" width="160.0" height="64.0" rx="7" />
+<text class="node-label" x="770.0" y="90.0">feed_item_mentions</text>
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+<g id="node-highlights">
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