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Azure Integration Services

Azure Service Bus

Enterprise messaging that never loses an order: decouple systems, absorb peaks and process messages in the right order.

Enterprise message broker for reliable asynchronous messaging. Service Bus offers:

  • Queues: Point-to-point messaging, with FIFO ordering when you use sessions
  • Topics & subscriptions: Publish-subscribe messaging patterns
  • Sessions: Ordered message processing and correlation
  • Dead-letter queues: Automatic handling of unprocessable messages

Azure Service Bus best practices

Several workers share one queue, each customer's messages stay in order, and a message that keeps failing is set aside instead of blocking the rest.

Competing consumers on a session queue

Queue orders

17·118·117·219·118·217·3
Session 17Session 18Session 19
Worker ASession 17
✓ 0
Worker BSession 18
✓ 0
Worker CSession 19
✓ 0
Dead-letter queue

Six messages wait in the queue, grouped by session (one customer order each).

Illustrative example
Each worker locks one session so every customer's messages are processed in order; after three failed deliveries (MaxDeliveryCount is set to 3 here; the default is 10) the malformed message moves to the dead-letter queue for inspection.

Message properties & metadata

  • ContentType: Specify message format (application/json, text/xml)
  • CorrelationId: Correlate request and response messages
  • SessionId: Group related messages for ordered processing
  • MessageId: Unique identifier for deduplication
  • Custom properties: Add application-specific metadata for filtering

Performance optimization

  • Batch processing: Send/receive multiple messages in a single operation
  • Prefetching: Client-side message caching for improved throughput
  • Partitioning: Distribute messages across multiple message brokers (per entity in Basic and Standard, per namespace in Premium)
  • Premium tier: Dedicated resources for predictable performance
  • Message size: Keep messages small, use claim check pattern for large payloads

Advanced features

Message sessions

Guarantee FIFO processing for related messages. Use sessions for:

  • Processing all messages for an order in sequence
  • Implementing stateful message processing workflows
  • Load balancing across multiple consumers while maintaining order

Scheduled messages

Enqueue messages to be available at a future time. Use cases:

  • Delayed notification delivery
  • Reminder systems and scheduled tasks
  • Rate limiting with message spacing

Auto-forwarding

Chain queues and subscriptions for complex routing:

  • Implement pipeline processing patterns
  • Forward to another queue or topic in the same namespace (Standard and Premium tiers, up to four hops)
  • Dead-letter queue consolidation
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