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When Kafka Consumer Lag spikes, simply scaling consumers is often not enough. This post walks through practical incident analysis: distinguishing broker issues from consumer issues, checking partition imbalance, spotting retry storms, and finding downstream bottlenecks that actually caused the lag.
A practical guide to handling failed Kafka messages with Dead Letter Queues. Covers when to retry, when to send to DLQ, what metadata to keep, and how to design safe replay workflows.
A practical incident guide for diagnosing database connection exhaustion. Covers application pool configuration, slow queries, connection leaks, traffic spikes, and a step-by-step recovery approach.
Five root causes of CrashLoopBackOff and a step-by-step debugging approach. Essential kubectl commands and real-world resolution examples.
Five common memory leak patterns in Spring Boot applications and how to quickly diagnose them with Heap Dump analysis.
Failure patterns you actually encounter when running Redis in production, and how to diagnose them. Case-by-case solutions for OOM, connection exhaustion, blocked clients, replication lag, and more.
Every cause and fix for Docker permission denied errors. Covers /var/run/docker.sock access, volume mount permissions, and file permission issues inside containers.
Step-by-step response when a Kubernetes Node enters NotReady state. Root cause diagnosis, workload evacuation, and recovery procedures — a real-world operations guide.
Seven common causes of NPE in Spring Boot development, and how to prevent them fundamentally using Optional, defensive coding, and tests.