Diagnose and Debug Apache Kafka Issues: Understanding Increased Connections

This post focuses on diagnosing and debugging increased connection issues in Apache Kafka. It details the types of connections across the cluster (producer, consumer, broker), explains relevant metrics like connection-count, connection-creation-rate, and AcceptorBlockedPercent, and explores common root causes such as undersized workloads, incorrect consumer-per-thread patterns, and multiple KafkaProducer instances within a single process.