On 10/29/2015 01:17 PM, Andreas Welchlin wrote:
I am running a qpidd message broker (C++ / version 0.28). All
applications are connected via C++ messaging api on the same machine.
One of the connected applications handles messages twice. I ask myself
if the message broker resent messages to this application but I can not
verify it.
In which cases would the qpidd resend messages to an application?
If a session ends (e.g. due to a client being disconnected), any
unacknowledged messages that had been sent to that client would be
requeued and could then be redelivered to any other subscriber
(including the original subscriber if it re-connected).
Would the qpidd set the redelivered flag to 1 when it would resend a
message?
Yes
Can I see in the logfile of the qpidd when it redelivers a message?
--log-enable trace+:Protocol --log-enable notice+ will log *all* the
inputs and outputs, which would show any redelivered messages, but that
may be more than you want. There isn't a specific log message for a
redelivery.
(Note one other possibility when seeing duplicates is that they are
resent by the original publisher, e.g. if it gets disconnected with
in-doubt messages, then it may reconnect and resend them. The
redelivered flag should ideally be set then also).
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