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batch_pull! error on batch arn:aws:ecs:us-west-2:002596530511:task/cupix-tesla-ece/ab866da276af40d4b

Service
cupixworks-worker
Occurrences
407,273
Status
Reported
Confidence
85%
Actionability
28%
Cluster ID
1ad7f6fa-20d4-401e-8bc1-eeb0559d7bed
First Seen
2026-07-13 07:06 UTC
Last Seen
2026-08-05 04:52 UTC
Actions

batch_pull! error on batch arn:aws:ecs:us-west-2:002596530511:task/cupix-tesla-ece/ab866da276af40d4b

What Happened#

2026-07-13 16:06 KST 부터 약 40분간 cupixworks-worker 서비스에서 AwsTask.batch_pull! 이 377회 연속 실패했다. 원인은 IAM 사용자 tesla-api-production-5nodecs:DescribeTasks 권한을 가지고 있지 않아 AWS ECS API 호출이 AccessDeniedException 으로 거부된 것이다. 동일한 권한 오류가 최소 2026-06-29 부터 존재해 왔고 (Datadog retention 상한), 2분마다 실행되는 cron (Cupix::Cron::AwsTask.pull_pending, pull_blank) 이 pending/blank 상태인 AwsTask 레코드를 반복 조회하면서 그 시점에 큐잉된 대량의 task 를 배치로 처리하는 순간마다 스파이크가 발생한다.

Quick Facts#

Field Value
exception.class Aws::ECS::Errors::AccessDeniedException (rescued as StandardError)
exception.message User: arn:aws:iam::002596530511:user/system/tesla-api-production-5nod is not authorized to perform: ecs:DescribeTasks on resource: * because no identity-based policy allows the ecs:DescribeTasks action
top_frame app/models/aws_task.rb:55 (ecs.describe_tasks)
runtime Rails / Sidekiq (cupixworks-worker)
env production, ECS cluster cupix-tesla-ece in us-west-2
iam_user arn:aws:iam::002596530511:user/system/tesla-api-production-5nod

Affected Teams#

Team / Domain Error Count Impact
cupixworks-worker (ECS task lifecycle tracking) 377 AwsTask 레코드의 last_status/desired_status 가 실제 ECS task 상태와 동기화되지 않음. Job.run_task_stopped_callbacks 가 트리거되지 않아 stopped task 에 대한 후속 처리(콜백)가 지연될 위험

Timeline#

  1. 2026-06-29 20:21 KSTPullTaskWorker::perform | error on 9836 ... not authorized to perform: ecs:DescribeTasks — 동일 권한 오류 최초 관측 (Datadog 14일 retention 상한이라 실제 시작 시점은 더 이를 수 있음).
  2. 2026-07-13 16:03 KSTPullTaskWorker::perform | error on 10256 (개별 워커 경로에서도 동일 오류) 재확인.
  3. 2026-07-13 16:06:30 KSTAwsTask.batch_pull! 배치 경로에서 오류 스파이크 시작 (cluster first_seen).
  4. 2026-07-13 16:46:18 KST — 스파이크 종료 (cluster last_seen). 40분 동안 377건.
  5. 2026-07-13 16:34–16:46 KST — 상태 보드에 cupixworks-worker service degraded 인시던트 자동 생성 (id 2026-07-13-svc-cupixworks-worker--unknown-2, 3 clusters 그룹핑).

Scoring#

Confidence 85% · Actionability 28%

Confidence#

Dimension Score Detail
Evidence completeness 5/5 18 code refs, 5 log queries
Code path explicitness 3/3 18 file:line refs
Log evidence 2/3 section, query
RCA structure 3/3 3/3 sections
Revision history 1/3 1 revision(s)
Agent execution 3/3 success

Actionability#

Dimension Score Detail
Fix complexity 1/5 critical
Affected files 1/5 19 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