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From Christian Fromme <...@strace.org>
Subject Re: Qpid hanging in qpid::messaging::createSession()?
Date Fri, 21 Jun 2013 12:45:25 GMT
Hi Gordon,

thanks for your quick reply.

On Fri, Jun 21, 2013 at 2:41 PM, Gordon Sim <gsim@redhat.com> wrote:

>> When the qpidd vanishes during a client calling this:
>>
>>          Connection connection(url, connection_options);

> You need a connection.open() here.

Oops. That's right. I wonder why it worked while qpidd is running.
Probably because of the reconnect:true.

>> #0  0xffffe424 in __kernel_vsyscall ()
>> #1  0xb4c089d6 in nanosleep () from /lib/libc.so.6
>> #2  0xb4c3a8ac in usleep () from /lib/libc.so.6
>> #3  0xb5968e72 in qpid::sys::usleep(unsigned long long) () from
>> /opt/qpid/qpid-0.20-1dfs/lib/libqpidcommon.so.2
>> #4  0xb785c34f in
>> qpid::client::amqp0_10::ConnectionImpl::connect(qpid::sys::AbsTime
>> const&) () from /opt/qpid/qpid-0.20-1dfs/lib/libqpidmessaging.so.2
>> #5  0xb785c636 in qpid::client::amqp0_10::ConnectionImpl::open() ()
>> from /opt/qpid/qpid-0.20-1dfs/lib/libqpidmessaging.so.2
>> #6  0xb78589e4 in qpid::client::amqp0_10::ConnectionImpl::reopen() ()
>> from /opt/qpid/qpid-0.20-1dfs/lib/libqpidmessaging.so.2
>> #7  0xb7858fa9 in
>> qpid::client::amqp0_10::ConnectionImpl::newSession(bool, std::string
>> const&) () from /opt/qpid/qpid-0.20-1dfs/lib/libqpidmessaging.so.2
>> #8  0xb782866e in
>> qpid::messaging::Connection::createSession(std::string const&) () from
>> /opt/qpid/qpid-0.20-1dfs/lib/libqpidmessaging.so.2
>
> The stack trace shows it is trying to 'reconnect'. This may be because the
> connection was not actually opened in the first place(?). In any case this
> would happen if the connection was established and was then lost. If the
> broker(s) specified never become available then the reconnect will never
> succeed. You can limit the time or number of retries with some combination
> of the following:
>
> - reconnect_timeout: seconds (give up and report failure after specified
> time)
> - reconnect_limit: n (give up and report failure after specified number of
> attempts)
> - reconnect_interval_min: seconds (initial delay between failed reconnection
> attempts)
> - reconnect_interval_max: seconds (maximum delay between failed reconnection
> attempts)
> - reconnect_interval: shorthand for setting the same
> reconnect_interval_min/max

Nice, thank you very much! I will try to fix the connection.open()
issue and play around with those options.

Best wishes,
kaner

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