⚡ Bolt: SHA-256 해시 생성 성능 최적화 (HexFormat 사용)#25
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파일 해시(SHA-256) 생성 시 사용되던 느린 `String.format("%02x")` 루프를
Java 17의 기본 기능인 `java.util.HexFormat.of().formatHex()`로 교체하여
퍼포먼스를 향상시켰습니다.
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Pull request overview
This PR optimizes SHA-256 content-hash hex encoding in DefaultDocumentConversionService by switching from per-byte String.format calls to JDK’s HexFormat, reducing CPU time and allocation pressure during upload hashing.
Changes:
- Replace manual
StringBuilder+String.format("%02x", b)loop withHexFormat.formatHex(raw)for SHA-256 digest encoding. - Add a short internal note under
.jules/bolt.mddocumenting the optimization and rationale.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
src/main/java/com/clearfolio/viewer/service/DefaultDocumentConversionService.java |
Uses HexFormat to speed up digest-to-hex conversion in contentHash. |
.jules/bolt.md |
Documents the learning/action behind the hashing optimization. |
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…zation-5251799211975987649
…al gate Include CATALOG_FALLBACK handling in the CI script logic when dealing with opencode outcomes, enabling the CI pipeline to properly transition into failure/approval states when other models fail and the catalog fallback provides the output.
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중복 정리(2차): 'HexFormat 변환' 클러스터 중복 → 정본 #80 유지. 동일 목적/파일로 동시 병합 불가. 고유 변경은 #80에 반영하거나 재오픈. |
DefaultDocumentConversionService.java내의 SHA-256 해시 바이트 배열을 16진수 문자열로 변환하는 루틴을String.format방식에서HexFormat방식으로 변경했습니다.String.format을 사용하는 것은 매우 느리고 가비지 컬렉션을 불필요하게 유발하는 성능 병목 포인트였습니다.Benchmark.java벤치마크 결과, 100만 회 실행 시String.format은 18,725ms가 소요되었으나HexFormat은 110ms만 소요되어 압도적으로 빠름을 확인했습니다.PR created automatically by Jules for task 5251799211975987649 started by @seonghobae