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Hi all,

I think it is a bug of qpid as rpcbackend.

   Other service(nova-compute, cinder-scheduler, etc) use eventlet thead to
run service. They stop service use thread kill() method. The last step
rpc.cleanup() just did nothing, because the relative consume connection run
in thread and killed. I think it is unnecessary. All queue is auto-delete,
they will be removed when all receiver disappear.

However, cinder-volume use process to run service, so stop service need to
close connection and receiver (consumer) of the session of connection need
to close when call connection.close().
receiver close will sent MessageCancel and QueueDelete message to
broker(qpid server), so that all cinder-volume queue be removed.

I think that the reason of problem confused me.

But I don't know how to solve it.


2013/5/28 minmin ren <rmm0811 at gmail.com>

> I think I found some problems of qpid as rpcbackend, however I'm not sure
> about it. Could anyone  try to test it with your environment?
>
> openstack grizzly version
>
> config file need debug=True
>
> 1. service openstack-cinder-scheduler stop (nova-compute, nova-scheduler,
> etc)
> 2. " vi /var/log/cinder/scheduler.log "  some info will be found like
> this.
>
> I deployed two machines(node1 and dev202)
>
> 2013-05-27 06:02:46 CRITICAL [cinder] need more than 0 values to unpack
> Traceback (most recent call last):
>   File "/usr/bin/cinder-scheduler", line 50, in <module>
>     service.wait()
>   File "/usr/lib/python2.6/site-packages/cinder/service.py", line 613, in
> wait
>     rpc.cleanup()
>   File
> "/usr/lib/python2.6/site-packages/cinder/openstack/common/rpc/__init__.py",
> line 240, in cleanup
>     return _get_impl().cleanup()
>   File
> "/usr/lib/python2.6/site-packages/cinder/openstack/common/rpc/impl_qpid.py",
> line 649, in cleanup
>     return rpc_amqp.cleanup(Connection.pool)
>   File
> "/usr/lib/python2.6/site-packages/cinder/openstack/common/rpc/amqp.py",
> line 671, in cleanup
>     connection_pool.empty()
>   File
> "/usr/lib/python2.6/site-packages/cinder/openstack/common/rpc/amqp.py",
> line 80, in empty
>     self.get().close()
>   File
> "/usr/lib/python2.6/site-packages/cinder/openstack/common/rpc/impl_qpid.py",
> line 386, in close
>     self.connection.close()
>   File "<string>", line 6, in close
>   File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py",
> line 316, in close
>     ssn.close(timeout=timeout)
>   File "<string>", line 6, in close
>   File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py",
> line 749, in close
>     if not self._ewait(lambda: self.closed, timeout=timeout):
>   File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py",
> line 566, in _ewait
>     result = self.connection._ewait(lambda: self.error or predicate(),
> timeout)
>   File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py",
> line 208, in _ewait
>     result = self._wait(lambda: self.error or predicate(), timeout)
>   File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py",
> line 193, in _wait
>     return self._waiter.wait(predicate, timeout=timeout)
>   File "/usr/lib/python2.6/site-packages/qpid/concurrency.py", line 57, in
> wait
>     self.condition.wait(3)
>   File "/usr/lib/python2.6/site-packages/qpid/concurrency.py", line 96, in
> wait
>     sw.wait(timeout)
>   File "/usr/lib/python2.6/site-packages/qpid/compat.py", line 53, in wait
>     ready, _, _ = select([self], [], [], timeout)
> ValueError: need more than 0 values to unpack
>
>
> I put the problems with multi-cinder-volumes on launchpad
> https://answers.launchpad.net/cinder/+question/229456
> Because I encountered this problems, however others services except
> cinder-volume never appear this problems.
> Then I found other services log print some critical info, error at
> self.connection.close()
> So I delete self.connection.close() which should not be removed, I watch
> qpid queue infomation, the problem which I  confused on
> multi-cinder-volumes disappear.
> As a result, I think the problem I found may be a bug.
>
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