default
For topics,
default specifies that messages are sent to each subscriber in turn. If the
maxbytes or
maxmsgs setting has been reached for a subscriber, that subscriber does not receive the message. No error is returned to the message producer.
For queues,
default specifies that new messages are rejected by the server and an error is returned to the producer if the established
maxbytes or
maxmsgs value has been exceeded.
Note:
When delivery delay is enabled for a topic, the behavior of
overflowPolicy=default mimics that of a queue. That is, when
maxbytes or
maxmsgs has been reached, new messages are rejected by the server and an error is returned to the producer.