MQSeries.net :: View topic - How to get queue manager to invalidate dead connections?

arincer · Posted: Thu Nov 10, 2005 6:42 am Post subject:

First some preliminaries. I'm using version 3.3 of the MQ client libraries on a Debian Linux 3.1 system. The version of MQ server I'm using is also 3.3, and that is running on a Mandrake 8.1 system.

I am MQGET()'ing messages from a queue. I have the MQGMO_SYNCPOINT option specified, so these messages are not permanently removed from the queue unless I do an explicit MQCMIT(). Messages are placed onto the queue with the MQPER_PERSISTENT option set so that messages will survive a restart of the queue manager.

The problem I have come across is the following. When I kill the network connection (via pulling the ethernet plug) between the client and the server before the MQCMIT() call is made, I would expect that the message that was just dequeued to be available again when I restore the network connection since the queue manager never got the command to do a commit. However, the message is not. I've noticed that the message does not become available again until I restart the queue manager.

Examining the status of the queue using the "runmqsc" when I kill the network connection, I noticed that the queue manager still maintains an open handle on the queue. (Doing a DISPLAY QSTATUS on the queue shows that the IPPROCS attribute is greater than 0). I believe that this is the source of the problem.

Is there a way to force the queue manager to invalidate the handle right away when the network connection between the client and the server goes down?