Engineering Logs for Troubleshooting & Debugging
Problem: PostgreSQL Pod Stalls Because PVC Remains Pending A PostgreSQL container launched by a StatefulSet (or plain Deployment) cannot start. The pod events contain messages such as: Warning FailedMount 12s (x3 over 30s) kubelet MountVolume.SetUp failed for volume “postgres-data” : could not attach or mount volume: failed to find a matching node for volume and the … Read more
Problem: RAG Embedding Dimension Mismatch after Model Update An event‑driven pipeline streams records into a PostgreSQL table that stores vector embeddings generated by a Retrieval‑Augmented Generation (RAG) model. After upgrading the model, inserts and similarity queries start failing with errors such as: ERROR: column “embedding” is of type vector(1536) but expression is of type vector(768) … Read more
Problem – Vision Token Embedding Overflow During ML Training A machine‑learning pipeline extracts image embeddings (e.g., CLIP vision tokens) and stores each intermediate token vector in a PostgreSQL table while training. During a nightly training run the following symptoms were observed: Rapid disk consumption: storage grew from 200 GB to 1.2 TB within a few hours. PostgreSQL … Read more
Problem – PostgreSQL HPA Not Scaling Under High CPU Usage The PostgreSQL deployment runs in a Kubernetes cluster that is part of an AI‑driven orchestration platform. During traffic spikes the API gateway generates thousands of concurrent requests per second, causing PostgreSQL CPU utilization to rise sharply. Expected behavior is that the Horizontal Pod Autoscaler (HPA) … Read more
Problem – OAuth2 Token Refresh Fails on Edge Nodes In a remote industrial monitoring deployment an edge‑computing node runs PostgreSQL 15 with OAuth2‑based client authentication. When the network latency to the central authentication service exceeds a few hundred milliseconds, connections are abruptly terminated and the following errors appear in the PostgreSQL log: 2024-05-12 10:23:45.123 UTC … 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 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