Public bug reported:
When launching several VMs in rapid succession, it is possible that libvirt's
image caching
will fetch the same image serveral times. This can occur when all of the VMs
in question
are using the same base image and this base image has not been previously
fetched. The inline
fetch_func_sync method prevents multiple threads from fetching the same image
at the same time,
but it does not prevent a thread that is waiting to acquire the lock from
fetching the image
that was being fetched while the lock was still in use. This is because the
presence of the image
is checked only before the lock has been acquired, not after.
** Affects: nova
Importance: Undecided
Status: New
** Tags: libvirt
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https://bugs.launchpad.net/bugs/1298420
Title:
Libvirt's image caching fetches images multiple times
Status in OpenStack Compute (Nova):
New
Bug description:
When launching several VMs in rapid succession, it is possible that libvirt's
image caching
will fetch the same image serveral times. This can occur when all of the VMs
in question
are using the same base image and this base image has not been previously
fetched. The inline
fetch_func_sync method prevents multiple threads from fetching the same image
at the same time,
but it does not prevent a thread that is waiting to acquire the lock from
fetching the image
that was being fetched while the lock was still in use. This is because the
presence of the image
is checked only before the lock has been acquired, not after.
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