npsend_check_mode

Specifies when the server is to provide confirmation upon receiving a NON_PERSISTENT message from a producer.

npsend_check_mode = [always | never | temp_dest | auth | temp_auth]

The npsend_check_mode parameter applies only to producers sending messages using NON_PERSISTENT delivery mode and non-transactional sessions.

Message confirmation has a great deal of impact on performance and should only be enabled when necessary. The circumstances in which a producer might want the server to send confirmation a NON_PERSISTENT message are:

• When authorization is enabled, so the producer can take action if permission to send the message is denied by the server.
• When sending to a temporary destination, so the producer can take action if the message is sent to a temporary destination that has been destroyed.
• The message exceeded queue/topic limit (requires rejectIncoming policy for topics).
• Bridging of the message has failed.
• The server is out of memory or has encountered some other severe error.

The possible npsend_check_mode parameter modes are:

• default (no mode specified) - this means the server only provides confirmation of a NON_PERSISTENT message if authorization is enabled.
• always - the server always provides confirmation of a NON_PERSISTENT message.
• never - the server never provides confirmation of NON_PERSISTENT messages.
• temp_dest - the server provides confirmation of a NON_PERSISTENT message only when sending to a temporary destination.
• auth - the server provides confirmation of a NON_PERSISTENT message only if authorization was enabled when the connection was created.
• temp_auth - the server provides confirmation of a NON_PERSISTENT message if sending to a temporary destination or if authorization was enabled when the connection was created.