** Changed in: nova
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1792503
Title:
allocation candidates "?member_of=" doesn't work with nested providers
Status in OpenStack Compute (nova):
Fix Released
Status in OpenStack Compute (nova) rocky series:
Won't Fix
Bug description:
"GET /allocation_candidates" now supports "member_of" parameter.
With nested providers present, this should work with the following
constraints.
---------------------------------------------
(a) With "member_of" qparam, aggregates on the root should span on the whole
tree
If a root provider is in the aggregate, which has been specified by
"member_of" qparam,
the resource providers under that root can be in allocation candidates even
the root is absent.
(b) Without "member_of" qparam, sharing resource provider should be
shared with the whole tree
If a sharing provider is in the same aggregate with one resource provider
(rpA),
and "member_of" hasn't been specified in qparam by user, the sharing provider
can be in
allocation candidates with any of the resource providers in the same tree
with rpA.
(c) With "member_of" qparam, the range of the share of sharing
resource providers should shrink to the resource providers "under the
specified aggregates" in a tree.
Here, whether the rp is "under the specified aggregates" is determined with
the constraints of (a). Namely, not only rps that belongs to the aggregates
directly are "under the aggregates",
but olso rps whose root is under the aggregates are also "under the
aggregates".
---------------------------------------------
So far at Stein PTG time, 2018 Sep. 13th, this constraint is broken in the
point that
when placement picks up allocation candidates, the aggregates of nested
providers
are assumed as the same as root providers. This means it ignores the
aggregates of
the nested provider itself. This could result in the lack of allocation
candidates when
an aggregate which on a nested provider but not on the root has been
specified in
the `member_of` query parameter.
This bug is well described in a test case which is submitted shortly.
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