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From "Jeff Ortel (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (QPID-6297) Python client (qpid.messaging) raises KeyError insead of reconnecting
Date Thu, 08 Jan 2015 15:23:39 GMT

    [ https://issues.apache.org/jira/browse/QPID-6297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14269433#comment-14269433
] 

Jeff Ortel commented on QPID-6297:
----------------------------------

No, gofer is very careful to not share any messaging library objects between threads.

> 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
>
> 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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