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Faraday::TimeoutError: Operation timed out after 10001 milliseconds with 0 bytes received

Service
cupixworks-elasticsearch
Occurrences
52
Status
Reported
Confidence
80%
Actionability
44%
Cluster ID
7b6ee075-a632-4068-ad7e-fc803f644025
First Seen
2023-10-27 00:58 UTC
Last Seen
2026-07-21 04:07 UTC
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Faraday::TimeoutError: Operation timed out after 10001 milliseconds with 0 bytes received

What Happened#

tesla (cupixworks-api)의 Elasticsearch 트랜스포트 호출이 설정된 10초 request timeout 을 초과하여 Faraday::TimeoutError("Operation timed out after 10001 milliseconds with 0 bytes received")가 발생했다. 이 에러는 Datadog APM 의 cupixworks-elasticsearch instrumentation span 에 기록된 것으로, 실제 앱 서비스는 tesla 이다. ES 클러스터가 10초 안에 단 1바이트도 응답하지 못한 transient 지연 상황으로, 약 33개월간 52건(하루 1건 미만)만 관측되었다.

Quick Facts#

Field Value
exception.class Faraday::TimeoutError
exception.message Operation timed out after 10001 milliseconds with 0 bytes received
top_frame faraday-0.17.5/lib/faraday/adapter/patron.rb:40 (라이브러리 프레임)
runtime Ruby / Rails (tesla), faraday 0.17.5 + patron 0.13.3 (libcurl) adapter, elasticsearch-transport 7.5.0
env production (region unknown)

Affected Teams#

Team / Domain Error Count Impact
tesla (cupixworks-api) 52 (33개월 누적) ES 호출 1건이 10초 timeout. 검색(read) 경로는 502(BG10002)로 표면화, 색인(write) 경로는 BulkIndexWorker 로 async 재시도되어 사용자 영향 미미

Timeline#

  1. 2023-10-27 09:58 KST — 최초 발생 (first_seen)
  2. 2026-07-21 13:07 KST — 최근 발생 (last_seen)
  3. 2026-08-04 — RCA 수행. Datadog 로그 검색 결과 0건(retention 14일 초과, last_seen이 14일 밖)

Scoring#

Confidence 80% · Actionability 44%

Confidence#

Dimension Score Detail
Evidence completeness 5/5 21 code refs, 4 log queries
Code path explicitness 3/3 21 file:line refs
Log evidence 2/3 section, query
RCA structure 3/3 3/3 sections
Revision history 0/3 0 revision(s)
Agent execution 3/3 success

Actionability#

Dimension Score Detail
Fix complexity 5/5 trivial
Affected files 1/5 23 file(s)
Single repo 1/3 3 service(s)
Immediate actions 0/3 absent
Testability 0/3 no test info
External dependency 1/3 external deps found
Data migration 3/3 no migration