On Wed, 2010-06-16 at 12:30 +0100, andrew.mar...@uk.bnpparibas.com wrote: > I have developed a set of interface classes for my client-server system > that allow me to switch in either ActiveMQ or MQSeries. I have been > testing what happens when the connection is lost to the Q mgr. I have > arranged for the server to halt so that it is restarted from the script > that kicks it off in the first place. I have arranged for the client to > detect that the connection has gone away and for it to reconnect. With > MQSeries this works. Here are some observations about what I had to do to > get it work: > > On the client side with ActiveMQ the receive behaves like it times out > when the connection goes away. So when that happens I write a heartbeat > message to the rqst Q. That does fail if the Q mgr is not there. I found > that with MQSeries the receive fails with an exception. So, with MQSeries > a heartbeat approach is not needed. I must admit, the MQSeries behaviour > is what I would expect. I was suprised when ActiveMQ didn't do this. Can > anyone comment please? > > On the server side I saw similar issues but I react to them differently. I > make the server die, since the script that kicks it off will restart it. > Eventually when the Q mgr comes back this means the server will be up and > running ok. With MQSeries this is just fine, but with ActiveMQ the server > just sits in the receive loop. The server cannot write heart beats > anywhere so I cannot use that approach on the server side. I tried using > an ExceptionListener but it seemed like it was not picking up anything. > Using an ExceptionListener was a right pain to add, especially because > afterwards I discovered that MQSeries does not need it (or invoke it). > What do people do to make their AMQ-cpp servers detect that the Q mgr has > gone away? > > I originally picked ActiveMQ to make things easier to develop and test > with. It was always going to go into production with MQSeries. It is quite > ironic that it ha actually been easier to do the development with > MQSeries. > > Regards, > > Andrew Marlow >
If you could provide a sample application that demonstrates the issue that would be helpful, also please provide information on what version of the client you are using and what versions of APR and APR-util you have installed. Regards -- Tim Bish Open Source Integration: http://fusesource.com ActiveMQ in Action: http://www.manning.com/snyder/ Follow me on Twitter: http://twitter.com/tabish121 My Blog: http://timbish.blogspot.com/
