Durable Behavior

Administrators configure the behavior of a durable and its interaction with durable subscribers.

For the configuration interface, see Durable Definition Reference.

Types of Durables: Standard, Shared, Last-Value, Map
Each type of durable supports a different set of use cases.
Standard Durable Reference
A standard durable strengthens delivery assurance for a subscriber.
Shared Durable Reference
A shared durable apportions a message stream among its subscribers.
Last-Value Durable Reference
A last-value durable preserves only the most recent message for subscribers. It does not track message acknowledgments from subscribers.
Message Interest
A persistence store collects all the messages from its publishers, but a subscriber might require only a subset of those messages, and different subscribers might require different subsets. (Developers and administrators coordinate to configure this behavior.)
Acknowledgment Mode
Durable subscribers acknowledge each message as they process it. However, the client library can transmit acknowledgements to the cluster in either of two modes: synchronous or asynchronous.