The affinity and anti-affinity server group policy is enforced by the
scheduler but two parallel scheduling could cause that such policy is
violated. During instance boot a late policy check was performed in
the compute manager to prevent this. This check was missing in case
of rebuild. Therefore two parallel evacuate command could cause that
the server group policy is violated. This patch introduces the late
policy check to rebuild to prevent such situation. When the violation
is detected during boot a re-scheduling happens. However the rebuild
action does not have the re-scheduling implementation so in this case
the rebuild will fail and the evacuation needs to be retried by the
user. Still this is better than allowing a parallel evacuation to
break the server group affinity policy.
To make the late policy check possible in the compute/manager the
rebuild_instance compute RPC call was extended with a request_spec
parameter.
Co-Authored-By: Richard Zsarnoczai <richard.zsarnoczai@ericsson.com>
Change-Id: I752617066bb2167b49239ab9d17b0c89754a3e12
Closes-Bug: #1735407
The instance list performance and reschedules issues have
been fixed in Queens so this updates the caveats section
of the cells v2 layout doc to point out those changes since
Pike.
Change-Id: I882f185554b6d2781534fa93e41e5010ea3a641d
The cells v2 layout documentation clearly states that there are no
upcalls from cells back to the central API services. This mislead
me for sometime as I could not fathom how a compute node in a cell
was supposed to report its resource info.
It turns out nova looks up the placement service in the keystone
catalogue and contacts it directly which to my mind is an upcall. I
wonder if the author of the not felt that the placement service is
not really part of nova?
Change-Id: If14be8b182f0af4e4e6641046fec638c07e26546
Closes-Bug: #1742421
Underscores make for really ugly URLs and every other document here is
now using hyphens for this very reason. Let's try to keep that going.
Change-Id: I5c99ff6b04ee97bac210a0d6762015225775c5ee
Zuul