Comment 6 for bug 928910

Reviewed: https://review.openstack.org/3919
Committed: http://github.com/openstack/nova/commit/27c11c4bb4e5c54282caf49cba666f45cfc590c2
Submitter: Jenkins
Branch: master

commit 27c11c4bb4e5c54282caf49cba666f45cfc590c2
Author: Jay Pipes <email address hidden>
Date: Wed Feb 8 15:51:59 2012 -0500

    Remedies LP Bug #928910 - Use libvirt lookupByName() to check existence

    Make determining if an instance exists on a host
    more efficient by adding an instance_exists() method to the
    base virt driver that can be overridden by drivers that
    have a more efficient mechanism of looking up an instance
    by its ID / name. Modifies the _check_instance_already_created
    method of the compute manager to use this new instance_exists() method.

    Someone from Citrix should look into how to make the instance_exists()
    method in the Xen and VMWare virt drivers more efficient than the
    base "loop over all domains and see if the instance ID exists" method
    now in the base driver class.

    Change-Id: Ibf219788f9c104698057367da89300a060945778