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I just encountered the same problem, when I added a decorator to a method
but the decorator did not exist.

Just putting it here as it took me quite a while to find this silly
problem, hope it helps somebody.

On Thu, Aug 23, 2012 at 12:10 AM, Ben <ben.div at gmail.com> wrote:

> Hum, ok but why ? I'm running essex out of the box packaged in Ubuntu
> 12.04. I didn't modify the code (except comment the raise line in cfg.py
> for this problem), but I did a lot of reinstall, modify configuration, drop
> nova db, etc.
>
> What would cause this circular import ? Can I tweak the code to avoid this
> circular import (as workaround to validate this hypothesis) ?
>
> Thanks to all for your help.
>
> Ben
>
>
> Le 22/08/2012 18:00, Vishvananda Ishaya a écrit :
>
>  You have a circular import somewhere That is causing scheduler/driver.py
>> to be imported twice.
>>
>> Vish
>> On Aug 22, 2012, at 8:33 AM, Ben <ben.div at gmail.com> wrote:
>>
>>  # grep -R scheduler_host_manager /usr/lib/python2.7/dist-**packages/nova
>>> /usr/lib/python2.7/dist-**packages/nova/scheduler/**driver.py:
>>> cfg.StrOpt('scheduler_host_**manager',
>>> /usr/lib/python2.7/dist-**packages/nova/scheduler/**driver.py:
>>> FLAGS.scheduler_host_manager)
>>> Fichier binaire /usr/lib/python2.7/dist-**packages/nova/scheduler/**driver.pyc
>>> concordant
>>> grep: /usr/lib/python2.7/dist-**packages/nova/CA/reqs/.**gitignore:
>>> Aucun fichier ou dossier de ce type
>>> grep: /usr/lib/python2.7/dist-**packages/nova/CA/.gitignore: Aucun
>>> fichier ou dossier de ce type
>>> grep: /usr/lib/python2.7/dist-**packages/nova/CA/projects/.**gitignore:
>>> Aucun fichier ou dossier de ce type
>>>
>>> If I comment the portion of code that raise the error (in
>>> _is_opt_registered(opts, opt) of cfg.py), I get the following error :
>>>
>>> ClassNotFound: Class SimpleScheduler could not be found: cannot import
>>> name vnc
>>>
>>> I have the same error if I replace --scheduler_driver by
>>> --scheduler_manager in nova.conf.
>>>
>>> novnc is not installed because it give a configure error, but
>>> nova-vncproxy is well installed.
>>>
>>> I suspect the error raised is not the original error, only side effect...
>>> I joined the trace of nova-scheduler before and after the code comment.
>>>
>>> What can I try now ?
>>>
>>> Ben
>>>
>>> Le 22/08/2012 17:00, Joseph Suh a écrit :
>>>
>>>> Ben,
>>>>
>>>> It is possible to have the option specified in a code. Try grep -r on
>>>> whole code.
>>>>
>>>> Thanks,
>>>>
>>>> Joseph
>>>>
>>>> ----- Original Message -----
>>>> From: "Ben" <ben.div at gmail.com>
>>>> To: "Joseph Suh" <jsuh at isi.edu>
>>>> Cc: openstack at lists.launchpad.net
>>>> Sent: Wednesday, August 22, 2012 10:47:35 AM
>>>> Subject: Re: [Openstack] Unable to start nova-scheduler : duplicate
>>>> option: scheduler_host_manager
>>>>
>>>> Hi Joseph,
>>>>
>>>> Thank you for your answer. Yes, but where could be that option ? It's
>>>> not duplicated in my nova.conf file, and this is the file the
>>>> nova-scheduler uses.
>>>> My nova.conf file joined.
>>>>
>>>> Regards,
>>>>
>>>> Ben
>>>>
>>>>
>>>> Le 22/08/2012 16:37, Joseph Suh a écrit :
>>>>
>>>>> Ben,
>>>>>
>>>>> As the error message suggests, it is due to a duplicated option of
>>>>> scheduler_host_manager. It is specified more than once somewhere.
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Joseph
>>>>>
>>>>> ----- Original Message -----
>>>>> From: "Ben" <ben.div at gmail.com>
>>>>> To: openstack at lists.launchpad.net
>>>>> Sent: Wednesday, August 22, 2012 8:27:39 AM
>>>>> Subject: Re: [Openstack] Unable to start nova-scheduler : duplicate
>>>>> option:     scheduler_host_manager
>>>>>
>>>>> Hi,
>>>>>
>>>>> No idea for my scheduler problem ? It was working at the beginning (I
>>>>> suppose because I could launch instances), but I did a lot of
>>>>> modification, modifying networks, deleting nova db, rebuild it, etc.
>>>>>
>>>>> Any idea on what I can do to identify the problem ? Where can I find
>>>>> the
>>>>> mentionned option except in nova.conf ?
>>>>>
>>>>> Ben
>>>>>
>>>>> Le 22/08/2012 00:46, Ben a écrit :
>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> I'm trying to setup a little nova cluster with 3 nodes :
>>>>>>
>>>>>> - 1 controller node running all services but compute
>>>>>> - 2 compute nodes running compute and network only
>>>>>>
>>>>>> I have faced a lot of issues, but I can't understand this one. When I
>>>>>> start nova-scheduler on controller node, the process dies instantly
>>>>>> with
>>>>>> this error :
>>>>>>
>>>>>> CRITICAL nova [-] duplicate option: scheduler_host_manager
>>>>>>
>>>>>> So I can't start an instance, it remains stuck in building state. I
>>>>>> have
>>>>>> checked my nova.conf file, and I only see this line :
>>>>>>
>>>>>> --scheduler_driver=nova.**scheduler.simple.**SimpleScheduler
>>>>>>
>>>>>> What does means this error, how can I solve it ?
>>>>>>
>>>>>> Thanks,
>>>>>>
>>>>>> Ben
>>>>>>
>>>>>
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>>>>>  <nova.conf><trace.log>________**______________________________**
>>> _________
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>>>
>>
>>
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