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measure(replication): 반동기 리플리카 2대 — count=1 이면 1대가 죽어도 강등되지 않는다 - #838
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리플리카 1대 구성의 «한 대가 죽으면 곧바로 조용히 강등» 을 실무식 구성이 피하는지 로컬(8.0.46)에서 확인. 소스 wait_for_replica_count 와 죽이는 리플리카 수를 팔로 두었다(버림 1 + 라틴 방격 9). - P count=1 · 1대 죽임: 본판 4/4 버팀 — 첫 쓰기가 timeout 을 안 물고 3건 모두 yes_tx - Q count=1 · 2대 죽임: 3/3 강등 (양성 대조군 — 계측이 강등을 잡는다) - R count=2 · 1대 죽임: 3/3 강등 — 2대여도 1대 구성과 같은 위험 - 리플리카 반동기는 시작 옵션이라 10/10 자동 복귀 - 부산물: 강등 뒤에도 소스 clients 가 수 초간 줄지 않았다 → 알람은 status·no_tx 에 (추론) 복제 문서 Q4 와 RPO·RTO §8 R3 에 결과를 연결한다. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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요약
리플리카 1대 구성에서 본 «한 대가 죽으면 곧바로 조용히 강등» 을, 리플리카 2대 +
wait_for_replica_count=1이 피하는지 로컬 Docker(8.0.46)에서 확인했다. 버림 1 + 라틴 방격 9판.clients가 수 초간 그대로 → 알람은status·no_tx에 (추론)조건
로컬 · 같은 호스트 ·
docker stop만. 쓰기 지연 절대값은docker exec왕복이 섞여 timeout 여부 판정에만 쓴다. AZ 별 배치 비용은 말하지 못한다.변경
loadtest/results/replication-semisync-two-replicas-2026-11-07/— rig·compose·산출물·READMEdocs/decisions/replication-lag-and-semisync.md— Q4 아래 결과 · 결정 로그docs/decisions/rpo-rto-targets.md— §8 R3 에 근거 링크🤖 Generated with Claude Code