yes, the defaults don't seem to be the best, I would JIRA it.
Carl.
Arnaud Simon 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
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