Public bug reported:

When nova used ironic driver, there was an exception which was always
logged in nova compute log fie periodically. The
update_available_resource method calls the  _get_host_metrics method to
cause this problem. In ironic driver , the get_host_cpu_stats method is
not implemented. so we should not log the exception message to eliminate
misunderstanding. The cycle logged message is as follows.

2017-03-20 14:14:43.669 10933 INFO nova.compute.resource_tracker 
[req-c4decc3b-f8b4-49c4-afba-40b6c70e86be - - - - -] Final resource view: 
name=20ba28a6-a00d-46e8-983e-c6ef4140cc21 phys_ram=0MB used_ram=0MB 
phys_disk=0GB used_disk=0GB total_vcpus=0 used_vcpus=0 pci_stats=[]
2017-03-20 14:14:43.670 10933 ERROR nova.compute.monitors.cpu.virt_driver 
[req-c4decc3b-f8b4-49c4-afba-40b6c70e86be - - - - -] Not all properties needed 
are implemented in the compute driver
2017-03-20 14:14:43.670 10933 ERROR nova.compute.monitors.cpu.virt_driver 
Traceback (most recent call last):
2017-03-20 14:14:43.670 10933 ERROR nova.compute.monitors.cpu.virt_driver   
File 
"/usr/lib/python2.7/site-packages/nova/compute/monitors/cpu/virt_driver.py", 
line 59, in _update_data
2017-03-20 14:14:43.670 10933 ERROR nova.compute.monitors.cpu.virt_driver     
stats = self.driver.get_host_cpu_stats()
2017-03-20 14:14:43.670 10933 ERROR nova.compute.monitors.cpu.virt_driver   
File "/usr/lib/python2.7/site-packages/nova/virt/driver.py", line 1224, in 
get_host_cpu_stats
2017-03-20 14:14:43.670 10933 ERROR nova.compute.monitors.cpu.virt_driver     
raise NotImplementedError()
2017-03-20 14:14:43.670 10933 ERROR nova.compute.monitors.cpu.virt_driver 
NotImplementedError
2017-03-20 14:14:43.670 10933 ERROR nova.compute.monitors.cpu.virt_driver 


So, I want to ignore the unimplemented excepion in the '_update_data'  method 
in virt_driver.py.

** Affects: nova
     Importance: Undecided
     Assignee: Tao Li (eric-litao)
         Status: New

** Project changed: ltsp => nova

** Changed in: nova
     Assignee: (unassigned) => Tao Li (eric-litao)

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https://bugs.launchpad.net/bugs/1674257

Title:
  we should not log  unimplemented error in _get_host_metrics method

Status in OpenStack Compute (nova):
  New

Bug description:
  When nova used ironic driver, there was an exception which was always
  logged in nova compute log fie periodically. The
  update_available_resource method calls the  _get_host_metrics method
  to cause this problem. In ironic driver , the get_host_cpu_stats
  method is not implemented. so we should not log the exception message
  to eliminate misunderstanding. The cycle logged message is as follows.

  2017-03-20 14:14:43.669 10933 INFO nova.compute.resource_tracker 
[req-c4decc3b-f8b4-49c4-afba-40b6c70e86be - - - - -] Final resource view: 
name=20ba28a6-a00d-46e8-983e-c6ef4140cc21 phys_ram=0MB used_ram=0MB 
phys_disk=0GB used_disk=0GB total_vcpus=0 used_vcpus=0 pci_stats=[]
  2017-03-20 14:14:43.670 10933 ERROR nova.compute.monitors.cpu.virt_driver 
[req-c4decc3b-f8b4-49c4-afba-40b6c70e86be - - - - -] Not all properties needed 
are implemented in the compute driver
  2017-03-20 14:14:43.670 10933 ERROR nova.compute.monitors.cpu.virt_driver 
Traceback (most recent call last):
  2017-03-20 14:14:43.670 10933 ERROR nova.compute.monitors.cpu.virt_driver   
File 
"/usr/lib/python2.7/site-packages/nova/compute/monitors/cpu/virt_driver.py", 
line 59, in _update_data
  2017-03-20 14:14:43.670 10933 ERROR nova.compute.monitors.cpu.virt_driver     
stats = self.driver.get_host_cpu_stats()
  2017-03-20 14:14:43.670 10933 ERROR nova.compute.monitors.cpu.virt_driver   
File "/usr/lib/python2.7/site-packages/nova/virt/driver.py", line 1224, in 
get_host_cpu_stats
  2017-03-20 14:14:43.670 10933 ERROR nova.compute.monitors.cpu.virt_driver     
raise NotImplementedError()
  2017-03-20 14:14:43.670 10933 ERROR nova.compute.monitors.cpu.virt_driver 
NotImplementedError
  2017-03-20 14:14:43.670 10933 ERROR nova.compute.monitors.cpu.virt_driver 

  
  So, I want to ignore the unimplemented excepion in the '_update_data'  method 
in virt_driver.py.

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