Engineering Logs for Troubleshooting & Debugging
Problem In an on‑premises data‑pipeline node that hosts a Kafka broker container, the pod repeatedly enters a CrashLoopBackOff state. The container exits after a few seconds, the orchestrator restarts it, and the cycle continues. The environment is a bare‑metal server with 4 vCPU and 8 GiB RAM, shared with other AI‑training services. The symptom manifests as: Kafka … Read more
Problem: Webhook timeout during rolling update of PostgreSQL pods in Kubernetes During a CI/CD‑driven rolling update of a PostgreSQL StatefulSet (or a Patroni‑managed cluster), the admission webhook that validates pod creation repeatedly fails with a timeout. Typical error messages observed in the controller logs are: Failed calling webhook “postgresql-admission-webhook”: context deadline exceeded Error from server … Read more
Problem Description In a Kubernetes‑based real‑time data pipeline, Redis is used as an in‑memory cache. The Horizontal Pod Autoscaler (HPA) is configured to scale the downstream consumer pods based on the Prometheus metric redis_memory_used_bytes exposed by redis_exporter. Operators observed the following inconsistent behavior: During brief traffic spikes the HPA adds 3‑4 extra pods, but the … Read more
Problem – Retrieval‑Augmented Generation (RAG) Returns Empty or Incomplete Answers in Batch Jobs In a production batch pipeline, dozens to thousands of queries are sent to Elasticsearch via the _msearch API. The retrieval component successfully runs, but the generation stage receives either an empty context field or a truncated list of documents. Consequently the final … Read more
Problem Description In a local AI training sandbox the microservices that compose the pipeline cannot locate the PostgreSQL instance. The typical error observed in the consuming service logs is: 2023-07-21T14:12:03.123Z microservice-a[12]: could not translate host name “postgres” to address: Name or service not known Other variants that appear during the investigation include: FATAL: could not … Read more
Problem – Context Window Overflow When Querying Large Document Indices In a development sandbox with a 2 GB JVM heap, a scroll query against an index that stores full‑text documents (>10 MB _source per doc) fails with errors such as: [2026-05-30T12:34:56,789][WARN ][o.e.c.m.SearchContext] [node-1] search_context_missing_exception: [search_context_id] missing or expired circuit_breaking_exception: request size [6.3mb] is too large, limit is … Read more