[FIX] 마감 캔들 비동기 저장 시, 중복 flush 안되도록 수정

[moonwhistle]

500건 또는 50ms 중 먼저 만족하는 조건으로 한 번 flush하도록 변경

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Project	Deployment	Actions	Updated (UTC)
coin-flow	Ready	Preview	Aug 26, 2026 3:49am

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Reviewing files that changed from the base of the PR and between 357a880 and 35b3b01.

📒 Files selected for processing (2)

• backend/coinflow-consumer-app/src/main/java/com/coinflow/aggregation/service/BatchAckWorker.java
• backend/coinflow-consumer-app/src/test/java/com/coinflow/aggregation/service/BatchAckWorkerTest.java

📝 Walkthrough

Walkthrough

BatchAckWorker가 고정 주기 flush에서 큐 상태 기반의 동적 flush로 변경되었습니다. 배치 크기에 도달하면 크기 flush를 한 번만 예약하고 완전한 배치를 연속 처리합니다. 배치가 부족하면 단일 interval flush를 예약합니다. 예약 세대 검증과 취소 처리가 추가되었습니다. flush는 완전한 배치 조건을 지원하고 처리 결과를 반환합니다. 동시 ACK 입력과 후속 부분 배치 처리를 검증하는 테스트가 추가되었습니다.

Estimated code review effort: 4 (Complex) | ~45 minutes

Merge Risk: 🟠 High · up to 357a8

The asynchronous batch flush can remove candle records even when Redis acknowledgement fails, with no demonstrated recovery path, creating a concrete risk of lost processing. Merge should be blocked until failed acknowledgements stop further draining and are retried or reclaimable.

Sequence Diagram(s)

sequenceDiagram
  participant ACKProducer
  participant BatchAckWorker
  participant ScheduledExecutorService
  participant RedisStream
  ACKProducer->>BatchAckWorker: ACK 추가
  BatchAckWorker->>ScheduledExecutorService: 크기 또는 interval flush 예약
  ScheduledExecutorService->>BatchAckWorker: flush 실행
  BatchAckWorker->>RedisStream: ACK 배치 처리
  BatchAckWorker->>ScheduledExecutorService: 남은 큐의 다음 flush 예약

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🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 13.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 15 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	제목은 중복 flush 방지라는 주요 변경 사항을 명확하게 설명합니다.
Description check	✅ Passed	설명은 500건 또는 50ms 조건에 따른 단일 flush 변경을 구체적으로 설명하며 변경 사항과 일치합니다.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In
`@backend/coinflow-consumer-app/src/main/java/com/coinflow/aggregation/service/BatchAckWorker.java`:
- Around line 242-243: Update BatchAckWorker.flush(String, boolean) to return
false when Redis acknowledge/XACK throws, so scheduleSizeFlush() stops draining
subsequent batches after the first failed acknowledgement. Ensure the failed
batch remains recoverable through an explicit local retry or PEL reclaim policy,
and add coverage verifying subsequent batches are not removed and the failed
batch is recovered.

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📥 Commits

Reviewing files that changed from the base of the PR and between 4a5b18f and 357a880.

📒 Files selected for processing (2)

• backend/coinflow-consumer-app/src/main/java/com/coinflow/aggregation/service/BatchAckWorker.java
• backend/coinflow-consumer-app/src/test/java/com/coinflow/aggregation/service/BatchAckWorkerTest.java

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