https://www.youngju.dev/blog 천천히 올바르게. AI Researcher & DevOps Engineer Youngju's tech blog. GPU/CUDA, LLM, MLOps, Kubernetes AI workloads, distributed training, and data engineering. ko fjvbn2003@gmail.com (Youngju Kim) fjvbn2003@gmail.com (Youngju Kim) Sun, 28 Jun 2026 00:00:00 GMT https://www.youngju.dev/blog/2026-06-28-reading-logs-and-stack-traces.en https://www.youngju.dev/blog/2026-06-28-reading-logs-and-stack-traces.en A stack trace is a crime scene; logs are witness statements. How to read a stack trace top to bottom (the top is where it blew up, the bottom is the origin), follow the "caused by" chain, use structured/JSON logging, correlate requests with trace_id, dig through logs with grep/jq/ripgrep, and use log levels and sampling. The detective skill of treating logs and traces as evidence. Sun, 28 Jun 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) loggingdebuggingstack-traceobservability https://www.youngju.dev/blog/2026-06-28-reading-logs-and-stack-traces.ja https://www.youngju.dev/blog/2026-06-28-reading-logs-and-stack-traces.ja スタックトレースは事件現場、ログは目撃者の証言です。スタックトレースを上から下へ読む方法（一方の端は壊れた場所、もう一方の端は発端）、「caused by」の連鎖の追跡、構造化・JSONロギング、相関IDとtrace_id、grep・jq・ripgrepでログを掘る、ログレベルとサンプリングまで。ログとトレースを証拠として扱う探偵の技術。 Sun, 28 Jun 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) loggingdebuggingstack-traceobservability https://www.youngju.dev/blog/2026-06-28-reading-logs-and-stack-traces https://www.youngju.dev/blog/2026-06-28-reading-logs-and-stack-traces 스택트레이스는 사건 현장이고, 로그는 목격자 진술입니다. 스택트레이스를 위에서 아래로 읽는 법(맨 위는 터진 곳, 맨 아래는 발단), "caused by" 사슬 추적, 구조화·JSON 로깅, 상관관계 ID와 trace_id, grep·jq·ripgrep으로 로그 파헤치기, 로그 레벨과 샘플링까지. 로그와 트레이스를 증거처럼 다루는 탐정의 기술. Sun, 28 Jun 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) loggingdebuggingstack-traceobservability