const{Fragment:i,jsx:h,jsxs:s}=arguments[0];function _createMdxContent(t){const e={a:"a",code:"code",figcaption:"figcaption",figure:"figure",h2:"h2",h3:"h3",img:"img",li:"li",p:"p",pre:"pre",span:"span",strong:"strong",table:"table",tbody:"tbody",td:"td",th:"th",thead:"thead",tr:"tr",ul:"ul",...t.components},{Callout:k,Diagram:a,E:l}=e;return k||_missingMdxReference("Callout",!0),a||_missingMdxReference("Diagram",!0),l||_missingMdxReference("E",!0),s(i,{children:[s(e.p,{children:["이 글에서는 동시 주문이 몰리는 ",h(l,{children:"분산 환경에서 재고를 안전하게 차감하는 방법"}),"을 단계별로 비교합니다. 한정된 재고 100개를 동시 주문자 200명(Thread)가 동시에 주문하는 테스트 코드를 기반으로, 모놀리식 서버에서 락을 활용한 방법부터 MSA 환경에서 ",h(l,{children:"Row 락을 최소로 잡으면서도 안전한 재고 차감"}),"을 위해 ",s(l,{children:[h(e.a,{href:"/posts/redis-essentials","data-keyword-link":"true",children:"Redis"})," Luascript로 원자적 재고 선점과 Saga 패턴으로 보상 트랜잭션 실행"]}),"으로 결제 실패·주문 취소 시 재고를 안전하게 release 하는 방안까지 따라갑니다."]}),"\n",s(e.ul,{children:["\n",h(e.li,{children:"상품의 재고는 초기 100개라고 가정합니다."}),"\n",h(e.li,{children:"200명의 사용자가 같은 옵션에 동시에 주문하는 시나리오 테스트입니다."}),"\n",h(e.li,{children:"정합성을 지키면 성공 100건, 재고 부족 100건, 최종 재고 0이 되어야 합니다."}),"\n"]}),"\n",h(e.h2,{id:"요구사항과-제약",children:"요구사항과 제약"}),"\n",h(e.h3,{id:"기능-요구",children:"기능 요구"}),"\n",s(e.ul,{children:["\n",h(e.li,{children:"회원이 옵션 ID와 수량(=1)으로 단건 주문을 생성한다"}),"\n",h(e.li,{children:"재고는 옵션(SKU 단위)으로 관리되며 주문 성공 시 차감"}),"\n",s(e.li,{children:["재고 부족 시 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"INSUFFICIENT_AMOUNT"})})})})," 에러로 거절"]}),"\n",h(e.li,{children:"동시성과 무관하게 정합성: 주문 성공 수가 초기 재고를 넘지 않고, 남은 재고가 음수가 되지 않는다"}),"\n"]}),"\n",h(e.h2,{id:"1-락-없음-출발점",children:"1. 락 없음 (출발점)"}),"\n",h(e.h3,{id:"개요",children:"개요"}),"\n",s(e.p,{children:["JVM 동기화도, DB 행 락도, 분산 락도 없습니다. 도메인 메서드 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"OptionStock.decrease"})})})}),"가 자기 조건(요청 수량이 현재 quantity보다 큰가)만 검사하고 차감을 진행합니다. 단일 스레드에서는 잘 동작하지만, 동시에 들어온 트랜잭션이 같은 옵션 행을 보면 조회와 쓰기 사이의 race로 정합성이 깨지는 출발점입니다."]}),"\n",h(a,{caption:"1단계 아키텍처: 200 트랜잭션이 같은 행을 동시에 읽고, 각자 계산한 절대값으로 덮어쓰는 lost update 경로",children:'flowchart LR\n Client["주문 요청
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// ... assert 결과: success / insufficient / 최종 재고"})}),"\n",h(e.span,{"data-line":"",children:h(e.span,{style:{"--shiki-atom-light":"#383A42","--shiki-atom-dark":"#E06C75","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#999999","--shiki-vitesse-dark":"#666666"},children:"}"})})]})})]}),"\n",s(e.p,{children:[h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"BusinessException + ErrorCode.INSUFFICIENT_AMOUNT"})})})}),"만 재고 부족 거절로 카운트하고 그 외 예외는 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"other"})})})})," 버킷으로 분리해, 의도하지 않은 거절(예: ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"OPTION_NOT_FOUND"})})})}),")이 주문 성공 누락으로 위장되는 것을 막습니다."]}),"\n",h(e.p,{children:h(e.img,{src:"/images/posts/mini-coupang-order-concurrency-locks/a-no-lock-200-thread-result.png",alt:"1단계 락 없음 200 스레드 측정 결과"})}),"\n",s(e.table,{children:[h(e.thead,{children:s(e.tr,{children:[h(e.th,{children:"항목"}),h(e.th,{children:"기대"}),h(e.th,{children:"실측"})]})}),s(e.tbody,{children:[s(e.tr,{children:[h(e.td,{children:"스레드 수"}),h(e.td,{children:"200"}),h(e.td,{children:"200"})]}),s(e.tr,{children:[h(e.td,{children:"초기 재고"}),h(e.td,{children:"100"}),h(e.td,{children:"100"})]}),s(e.tr,{children:[h(e.td,{children:"주문 성공"}),h(e.td,{children:"100"}),h(e.td,{children:h(e.strong,{children:"200"})})]}),s(e.tr,{children:[h(e.td,{children:"재고 부족 거절"}),h(e.td,{children:"100"}),h(e.td,{children:h(e.strong,{children:"0"})})]}),s(e.tr,{children:[h(e.td,{children:"남은 재고"}),h(e.td,{children:"0"}),h(e.td,{children:h(e.strong,{children:"56"})})]}),s(e.tr,{children:[h(e.td,{children:"저장된 주문"}),h(e.td,{children:"100"}),h(e.td,{children:h(e.strong,{children:"200"})})]})]})]}),"\n",s(e.p,{children:["읽기. 200 트랜잭션이 모두 재고 100을 본 채 검사를 통과해 재고 부족 거절이 0건이 됐습니다. 차감은 200번 시도되었으나 DB에 반영된 것은 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"100 - 56 = 44회"})})})}),", 56회분 차감이 lost update입니다. 주문 200건은 모두 INSERT되어 저장된 주문 수가 두 배로 부풀었습니다."]}),"\n",h(e.h3,{id:"한계",children:"한계"}),"\n",s(e.p,{children:["단일 스레드 환경에서는 정합성이 유지되지만, 200 트랜잭션이 거의 동시에 진입하면 모두 같은 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"quantity = 100"})})})}),"을 본 뒤 각자 차감을 시도해 56건이 lost update로 사라집니다. 도메인 메서드 안에는 조회와 쓰기 사이에 다른 스레드의 쓰기가 끼어드는 것을 막을 수단이 없기 때문입니다."]}),"\n",s(e.p,{children:["이 문제는 조회·검사·차감을 한 임계 영역으로 묶는 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"synchronized"})})})}),"로 해결할 수 있습니다."]}),"\n",h(e.h2,{id:"2-synchronized",children:"2. synchronized"}),"\n",h(e.h3,{id:"개요-1",children:"개요"}),"\n",s(e.p,{children:["1단계에서 lost update가 일어난 이유는 조회와 차감 사이에 다른 스레드가 같은 행의 오래된 값을 잡았기 때문입니다. JVM 안에서 가장 단순한 해법은 옵션 SKU 단위로 락을 잡고, 그 안에서 조회·검사·차감·커밋까지 한 큐에 처리하는 것입니다. ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"ConcurrentHashMap"})})})}),"에 옵션 ID를 키로 락을 보관해 서로 다른 옵션은 병렬로 처리되고, 같은 옵션의 동시 주문만 하나씩 직렬화됩니다. 락 해제는 자기 자신이 잡은 락만 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"finally"})})})}),"에서 푸는 try-finally 패턴으로 묶어 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"IllegalMonitorStateException"})})})})," 미스매치를 차단합니다."]}),"\n",h(a,{caption:"2단계 아키텍처: 옵션 SKU 별로 ReentrantLock 풀을 두어 같은 옵션만 직렬화. 트랜잭션은 락 안쪽 TransactionTemplate으로 열고 닫아 커밋까지 임계 영역에 포함",children:'flowchart LR\n Client["주문 요청
(200 동시)"]\n subgraph WAS["WAS (단일 JVM)"]\n Map["ConcurrentHashMap<Long, ReentrantLock>
(옵션 ID → 락)"]\n L["옵션 SKU 단위 락
computeIfAbsent로 획득"]\n TX["TransactionTemplate.execute
(락 안에서 begin → commit)"]\n OS["doPlaceOrder()
SELECT → 검사 → UPDATE"]\n end\n DB[("MySQL: option_stocks 행")]\n Out["성공 100 / 거절 100
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