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RabbitMQ Messaging & Async Systems · Lesson

Single Active Consumer

Learn how the Single Active Consumer feature guarantees ordered processing by routing all messages to one consumer at a time, with automatic failover to standbys.

Ordering vs Parallelism

Competing consumers boost throughput but break strict ordering: messages spread across workers can finish out of order.

Some workflows need both a hot standby and guaranteed sequence.

What Is Single Active Consumer?

Single Active Consumer (SAC) ensures only one consumer receives messages from a queue at a time, even if many consumers subscribe.

Others wait in line as standbys.

All lessons in this course

  1. Competing Consumers Pattern
  2. Prefetch Count (QoS)
  3. Exclusive Consumers & Consumer Priority
  4. Single Active Consumer
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