Normal messages

When you use an SDK to send and receive messages in ApsaraMQ for RocketMQ, you can use a topic to send and receive messages only of a specific type. Otherwise, O&M issues, such as the loss of scheduled messages during endpoint change or instance migration, may occur. For example, a topic of the normal message type can be used to send and subscribe to only normal messages. Similarly, a topic of the transactional message type can be used to send and subscribe to only transactional messages.