On 01/04/2019 22:33, Gordon Sim wrote:
On 01/04/2019 12:54 pm, Toralf Lund wrote:
On 28/03/2019 15:56, Toralf Lund wrote:
Hi,
I have another question related to my recent post about trying to
re-establish lost connections. Recall that my system is set up
without automatic reconnect, but may do a "manual reconnect" via
qpid::Messaging connection(url);
...
if(!connection.isOpen()) {
connection.open();
}
and that this is sometimes triggered by an "internal disconnect"
accompanied by an exception with message "Failed to connect
(reconnect disabled)".
Now, I just found that some of the reconnects are accompanied by a
"Session detached by peer" exception. I'm struggling a bit to find
out what exactly triggers this; the problems occur once every few
hours at a remote site, and I can't just start or stop or update the
software at any old time, so it's a bit hard to debug...
I just noticed that the broker log has something like
2019-04-01 11:11:42 [Broker] error Channel exception: session-busy:
Session already attached:
anonymous.c9a1f4cf-7427-4e77-8870-e118b099c6da
(/work/build/rpmbuild/BUILD/msat-qpid-cpp-1.36/msat-qpid-cpp-1.36.0/src/qpid/broker/SessionManager.cpp:55)
2019-04-01 11:11:46 [Protocol] error Connection
qpid.10.31.193.215:5672-10.31.192.61:35954 timed out: closing
for most or all the reconnects. The first time-stamp seems to
correspond to the connection open and "Session detached by peer"
exception.
Perhaps this means the broker still thinks the old connection is
open, even though the client considers it as lost? And maybe the
attempt to re-establish/re-use the old session with the new
connection fails as a result of that?
Correct. Does the broker log the loss of the connection, e.g. a timed
out notice? If so how does the time of that compare to the
session-busy error and to the client detecting the failed connection?
The broker also has a message saying "Connection ... timed out:
closing". This occurs 4-5 seconds after the session-busy error,
according to the timestamps.
- Toralf
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