running_deleted_instance_action should default to 'log'

[Andrew Glen-Young]

Currently the 'running_deleted_instance_action' flag in nova/compute/manager.py defaults to 'noop'. I argue that it should default to 'log'.

Rationale:

In a medium to large installation, it is not immediately obvious when you have "zombie" instances running on a compute node. These instances are a hinderance to the overall health of the system. Setting the flag to "log" would be beneficial to operations staff as they would be made more aware of the problem. I do not think that setting the flag to "log" would hinder developers of Openstack.

Unfortunately, these flags are not very discoverable and so it is less likely that someone in operations would change the default value.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/5156

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/5156
Committed: http://github.com/openstack/nova/commit/23c576a396ae963262a99f8fdf7c7d422ddb8bd2
Submitter: Jenkins
Branch: master

commit 23c576a396ae963262a99f8fdf7c7d422ddb8bd2
Author: Philip Knouff <email address hidden>
Date: Fri Mar 9 16:56:25 2012 +0000

    Change default of running_deleted_instance_action

    fixes bug #944997

    Change-Id: I3baea3a05c23b8869e4a4d13d4a31fdc67793f0f