bussinTechnical Reference Hub
Azure Service Bus Technical Glossary
Welcome to the technical terminology library for enterprise messaging diagnostics. Use this index to master core architecture standards, protocol layouts, and debugging workflows within Azure Service Bus.
AMQP 1.0 Wire Protocol
A binary, peer-to-peer transport protocol that defines the frame structures, credit flows, and state transfers governing direct Service Bus message exchanges.
Dead-Letter Sub-Queues (DLQ)
A system-managed secondary storage channel where expired, corrupted, or delivery-failed payloads are isolated by the broker for audit and recovery.
Alphabetical Reference Index
Use these definitions to align team terminology during architectural design phases or live-site triage sessions:
AMQP 1.0 (Advanced Message Queuing Protocol)
The standard binary messaging protocol specified by ISO/IEC 19464. Unlike HTTP-based REST, it operates long-lived TCP connections, optimizing telemetry throughput and tracking message states seamlessly. Learn more on the AMQP Protocol Page.
Dead-Letter Sub-Queue (DLQ)
An auxiliary queue automatically attached to every standard queue and topic subscription. When a message fails validation or exceeds limits, the broker routes it here with diagnostics headers. Learn more on the Dead-Letter Sub-Queue Page.
Lock Duration & Lease Renewals
The temporal window during which a receiver gains exclusive lock rights over a message. If processing outlasts the lease limit and no renewal occurs, the message is released back to active status, which can lead to duplicate processing.
Message Settlement (Complete, Abandon, Defer)
The protocol hand-shake that signals to the broker how to treat a locked message. Complete permanently purges it, Abandon unlocks it for retry, and Defer moves it to a sub-state requiring direct sequence number recall.
Topic Subscriptions & Filters
The publish-subscribe routing model. Topics publish messages to multiple concurrent subscriptions. The broker evaluates SQL, Correlation, or Boolean filters in real-time to selectively route payloads to active endpoints.