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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1252659

Title:
  Empty JSON caused: Error during
  ComputeManager._run_image_cache_manager_pass: No JSON object could be
  decoded

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  Hi.

  An empty file CONF.instances_path/compute_nodes is causing the following
  error. This prevents the image cache manager to run (i do not know if it has
  some other consequences):

      INFO nova.compute.resource_tracker [-] Compute_service record updated for XXX.ifca.es:XXX.ifca.es
      ERROR nova.openstack.common.periodic_task [-] Error during ComputeManager._run_image_cache_manager_pass: No JSON object could be decoded
      TRACE nova.openstack.common.periodic_task Traceback (most recent call last):
      TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/periodic_task.py", line 180, in run_periodic_tasks
      TRACE nova.openstack.common.periodic_task     task(self, context)
      TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 5040, in _run_image_cache_manager_pass
      TRACE nova.openstack.common.periodic_task     storage_users.register_storage_use(CONF.instances_path, CONF.host)
      TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/dist-packages/nova/virt/storage_users.py", line 65, in register_storage_use
      TRACE nova.openstack.common.periodic_task     return do_register_storage_use(storage_path, hostname)
      TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/lockutils.py", line 246, in inner
      TRACE nova.openstack.common.periodic_task     return f(*args, **kwargs)
      TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/dist-packages/nova/virt/storage_users.py", line 58, in do_register_storage_use
      TRACE nova.openstack.common.periodic_task     d = json.loads(f.read())
      TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/json/__init__.py", line 328, in loads
      TRACE nova.openstack.common.periodic_task     return _default_decoder.decode(s)
      TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/json/decoder.py", line 365, in decode
      TRACE nova.openstack.common.periodic_task     obj, end = self.raw_decode(s, idx=_w(s, 0).end())
      TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/json/decoder.py", line 383, in raw_decode
      TRACE nova.openstack.common.periodic_task     raise ValueError("No JSON object could be decoded")
      TRACE nova.openstack.common.periodic_task ValueError: No JSON object could be decoded
      TRACE nova.openstack.common.periodic_task

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