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.