From 542b6a008436f0b361dcf2d2b314b49c4999b04b Mon Sep 17 00:00:00 2001
From: Hyungi Ahn <hyungiahn@Hyungiui-MacBookPro.local>
Date: Sat, 16 May 2026 19:08:23 +0900
Subject: [PATCH] =?UTF-8?q?fix(search):=20classifier=20error=20log=20type+?=
 =?UTF-8?q?repr=20(empty-msg=20exception=20=EC=A7=84=EB=8B=A8)?=
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PR-Hermes-Docsrv-Search-1 Layer 1 fixture 가 classifier error: <빈 메시지> 빈번 발생
보고. isolation 직접 호출은 3/3 성공, 동시 부하 (ask endpoint 의 classifier + evidence
parallel) 시에만 발생.

Exception type + repr 캡처해서 root cause 식별 (httpx.ReadTimeout / TimeoutError /
ConnectionError / 기타 무엇인지). 식별 후 후속 PR (DS-Classifier-Concurrent-Load-1)
에서 본격 mitigation.
---
 app/services/search/classifier_service.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/services/search/classifier_service.py b/app/services/search/classifier_service.py
index a0c43ef..9661a48 100644
--- a/app/services/search/classifier_service.py
+++ b/app/services/search/classifier_service.py
@@ -113,7 +113,7 @@ async def classify(
         if _failure_count >= CIRCUIT_THRESHOLD:
             _circuit_open_until = time.time() + CIRCUIT_RECOVERY_SEC
             logger.error(f"classifier circuit OPEN for {CIRCUIT_RECOVERY_SEC}s")
-        logger.warning(f"classifier error: {e}")
+        logger.warning("classifier error: type=%s repr=%r", type(e).__name__, e)
         return ClassifierResult(
             "error", None, [], [],
             (time.perf_counter() - t_start) * 1000,