I too agree with Arnaud. By default it makes sense to keep retrying the list of brokers until all nodes are down.
Regards, Rajith On Tue, Mar 3, 2009 at 11:17 AM, Arnaud Simon <[email protected]> wrote: > Hello, > > I have been playing with our 0.10 cluster. When testing it I used a java > client and 2 brokers. I quickly ran into this issue: > > org.apache.qpid.transport.ConnectionException: connection closed > at org.apache.qpid.transport.Connection.send(Connection.java:294) > at org.apache.qpid.transport.Session.send(Session.java:455) > at org.apache.qpid.transport.Session.invoke(Session.java:599) > > > It appears that this is an expected behaviour of our default Java failover > manager. The default heuristic is to go roundrobin through the list of > brokers. This is fine really but our implementation does not reset the > cursor position after a successful failover. This means that if you > failover from A to B you will never failover from B to A anymore (assuming > that our list of broker only contains two brokers A and B). So, there is > an optional parameter "cyclecount" that can be used to define the number of > times to loop through the list of available brokers before failure. If this > parameter can be used to solve the issue of failing over to A after a > successful failover from A to B, it does solve this issue only for > "cyclecount" times :( Moreover, I believe that we don't really want to cycle > through all the brokers more than once when all the nodes of the broker are > down. We rather want to define a kind of back-retry mechanism. > > I would suggest that default implementation of our roundrobin failover > manbager should be changed to reset the cursor position within the broker > list to the current broker. Moreover, I believe that some people are > currently implementing a failover manager that uses a failover exchange. I > am wondering whether this manager shouldn't the default manager for our 0.10 > client? > > Please let me know what you think. Should we open a JIRA? > > Thanks > > Arnaud > > > --------------------------------------------------------------------- > Apache Qpid - AMQP Messaging Implementation > Project: http://qpid.apache.org > Use/Interact: mailto:[email protected] > > -- Regards, Rajith Attapattu Red Hat http://rajith.2rlabs.com/ --------------------------------------------------------------------- Apache Qpid - AMQP Messaging Implementation Project: http://qpid.apache.org Use/Interact: mailto:[email protected]
