Persistent Messages Sent to EMS Queues & Topics

Persistent Messages Sent to Queues

Persistent messages sent to a queue are always written to disk. Should the server fail before sending persistent messages to consumers, the server can be restarted and the persistent messages will be sent to the consumers when they reconnect to the server.

Persistent Messages Sent to Topics

Persistent messages published to a topic are written to disk ONLY IF that topic has at least one durable subscriber or one subscriber with a fault-tolerant connection to the EMS server.

Non-durable subscribers that re-connect after a server failure are considered newly created subscribers and are not entitled to receive any messages created prior to the time they are created.