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Posted to dev@qpid.apache.org by "Ernest Allen (JIRA)" <ji...@apache.org> on 2015/10/22 15:47:27 UTC
[jira] [Resolved] (QPID-6297) Python client (qpid.messaging) raises
KeyError insead of reconnecting
[ https://issues.apache.org/jira/browse/QPID-6297?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ernest Allen resolved QPID-6297.
--------------------------------
Resolution: Fixed
> Python client (qpid.messaging) raises KeyError insead of reconnecting
> ---------------------------------------------------------------------
>
> Key: QPID-6297
> URL: https://issues.apache.org/jira/browse/QPID-6297
> Project: Qpid
> Issue Type: Bug
> Components: Python Client
> Affects Versions: 0.22
> Environment: EL6
> Reporter: Jeff Ortel
> Assignee: Ernest Allen
> Fix For: qpid-cpp-0.34
>
> Attachments: goferBug.cap
>
>
> Description of problem:
> Having some temporary network outage causing gofer loses TCP connection to AMQP broker, it does not try to reconnect.
> How reproducible:
> 100%
> Steps to Reproduce:
> 1. Just to speedup reproducer, lower kernel tunable net.ipv4.tcp_retries2 to e.g. 4:
> echo 4 > /proc/sys/net/ipv4/tcp_retries2
> 2. Have consumer connected (with auto-reconnect enabled and heartbeats not enabled) and receiver open on a queue address and check its TCP connections to AMQP broker:
> netstat -anp | grep 5671
> (there should be 2 TCP connections)
> 3. Emulate network outage via iptables:
> iptables -A OUTPUT -p tcp --dport 5671 -j REJECT
> 4. Monitor /var/log/messages; once it logs WARNING "recoverable error", flush iptables (iptables -F).
> 5. Wait few seconds.
> 6. Check gofer TCP connections:
> netstat -anp | grep 5671
> Actual results:
> 6. shows just 1 TCP connection
> /var/log/messages repeatedly logs:
> Dec 1 16:39:02 pmoravec-rhel6-3 goferd: [ERROR][pulp.agent.a726580c-5f1e-4a79-9f11-de0adc52c1e9] gofer.transport.qpid.consumer:117 - 046d2084-b0f1-4de4-a039-89499d9e680d
> Dec 1 16:39:02 pmoravec-rhel6-3 goferd: [ERROR][pulp.agent.a726580c-5f1e-4a79-9f11-de0adc52c1e9] gofer.transport.qpid.consumer:117 - Traceback (most recent call last): File "/usr/lib/python2.6/site-packages/gofer/transport/qpid/consumer.py", line 113, in get return self.__receiver.fetch(timeout=timeout) File "<string>", line 6, in fetch File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 1030, in fetch self._ecwait(lambda: self.linked) File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 50, in _ecwait result = self._ewait(lambda: self.closed or predicate(), timeout) File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 993, in _ewait result = self.session._ewait(lambda: self.error or predicate(), timeout) File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 580, in _ewait result = self.connection._ewait(lambda: self.error or predicate(), timeout) File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 219, in _ewait self.check_error() File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 212, in check_error raise e InternalError: Traceback (most recent call last): File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 660, in write op.dispatch(self) File "/usr/lib/python2.6/site-packages/qpid/ops.py", line 84, in dispatch getattr(target, handler)(self, *args) File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 877, in do_session_detached sst = self._sessions.pop(dtc.channel) KeyError: 'pop(): dictionary is empty'
> Expected results:
> 2nd TCP connection re-established, no errors in /var/log/messages
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