85 lines
7.3 KiB
XML
85 lines
7.3 KiB
XML
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<title id="diagram-title">200 과 디스크 사이의 빈 구간</title>
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<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="135.5" y="921.0">PostgreSQL</text>
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<text class="node-detail" x="57.5" y="959.0">wal_writer_delay 200ms</text>
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<text class="node-detail" x="57.5" y="1307.0">DB 존재 149건</text>
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