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hi all ,
I set up nova environment with latest upstream code.
nova-compute can not boot up due to failed to load libvirt driver.
by further debugging. found that eventlet (0.16.0) remove util which is 
referenced by libvirt driver.
after I downgrade to (0.15.2) it works.

*0.15.2*

In [3]: print eventlet.__version__
0.15.2

In [5]: import eventlet.util

In [6]:

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
*0.16.0**
*

In [1]: import eventlet.util
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-1-a23626d6f273> in <module>()
----> 1 import eventlet.util

ImportError: No module named util

In [3]: import eventlet

In [4]: print eventlet.__version__
0.16.0

In [5]:

++++++++++++++++++++++++++++++++++++++++++++++++


In [1]: import nova.virt.libvirt.LibvirtDriver
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-1-2bdce28fc3dd> in <module>()
----> 1 import nova.virt.libvirt.LibvirtDriver

/opt/stack/nova/nova/virt/libvirt/__init__.py in <module>()
      13 #    under the License.
      14
---> 15 from nova.virt.libvirt import driver
      16
      17 LibvirtDriver = driver.LibvirtDriver

/opt/stack/nova/nova/virt/libvirt/driver.py in <module>()
      96 from nova.virt.libvirt import dmcrypt
      97 from nova.virt.libvirt import firewall as libvirt_firewall
---> 98 from nova.virt.libvirt import host
      99 from nova.virt.libvirt import imagebackend
     100 from nova.virt.libvirt import imagecache

/opt/stack/nova/nova/virt/libvirt/host.py in <module>()
      37 from eventlet import patcher
      38 from eventlet import tpool
---> 39 from eventlet import util as eventlet_util
      40
      41 from nova import exception

ImportError: cannot import name util

In [2]: import eventlet

In [3]: from eventlet import util
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-3-f6f91e4749eb> in <module>()
----> 1 from eventlet import util

ImportError: cannot import name util

In [4]:

-- 
Thanks,
Eli (Li Yong) Qiao

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