Azure Event Hubs vs Azure Service Bus

Azure Event Hubs and Azure Service Bus are both messaging services on Azure, but they're designed for very different scenarios — one for high-throughput event streaming, the other for reliable enterprise messaging.

Azure Event Hubs

• Built for ingesting massive volumes of events — millions per second
• Optimized for telemetry, logs, and streaming analytics scenarios
• Uses a partitioned log model, similar to Apache Kafka
• Events are retained for a configurable period and can be replayed

Azure Service Bus

• Built for reliable, transactional enterprise messaging
• Supports queues (point-to-point) and topics (publish-subscribe)
• Offers advanced features like sessions, dead-lettering, and duplicate detection
• Better suited for business workflows that need guaranteed, ordered processing

Key Differences

• Throughput — Event Hubs handles far higher event volumes than Service Bus
• Message model — Event Hubs is stream-based; Service Bus is message/queue-based
• Use case — Event Hubs suits telemetry and analytics; Service Bus suits business transactions
• Message lifetime — Event Hubs retains a stream for replay; Service Bus removes messages once processed