Public bug reported:
If a child cell has compute nodes without a heartbeat update but enabled (XXX
state with
"nova-manage service list") the child cell continues to consider the available
resources of
these compute nodes when updating the cell capacity.
This can be problematic when having several cells and trying to fill them
completely.
Requests are sent to the cell that can fit more instances of the requested type
however
when compute nodes are "down" the requests will fail with "No valid host" in
the cell.
When updating the cell capacity the "disabled" compute nodes are excluded. This
should
also happen if the compute node didn't have a heartbeat update during the
"CONF.service_down_time".
How to reproduce:
1) Have a cell environment with 2 child cells (A and B).
2) Have nova-cells running in "debug". Confirm that the "Received capacities
from child cell" A and B (in top nova-cell log) matches the number of available
resources.
4) Stop some compute nodes in cell A.
5) Confirm that the "Received capacities from child cell A" don't change.
6) Cell scheduler can send requests to cell A that can fail with "No valid
host".
** Affects: nova
Importance: Undecided
Assignee: Belmiro Moreira (moreira-belmiro-email-lists)
Status: New
** Tags: cells
** Changed in: nova
Assignee: (unassigned) => Belmiro Moreira (moreira-belmiro-email-lists)
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https://bugs.launchpad.net/bugs/1532562
Title:
Cell capacities updates include available resources of compute nodes
"down"
Status in OpenStack Compute (nova):
New
Bug description:
If a child cell has compute nodes without a heartbeat update but enabled (XXX
state with
"nova-manage service list") the child cell continues to consider the
available resources of
these compute nodes when updating the cell capacity.
This can be problematic when having several cells and trying to fill them
completely.
Requests are sent to the cell that can fit more instances of the requested
type however
when compute nodes are "down" the requests will fail with "No valid host" in
the cell.
When updating the cell capacity the "disabled" compute nodes are excluded.
This should
also happen if the compute node didn't have a heartbeat update during the
"CONF.service_down_time".
How to reproduce:
1) Have a cell environment with 2 child cells (A and B).
2) Have nova-cells running in "debug". Confirm that the "Received capacities
from child cell" A and B (in top nova-cell log) matches the number of available
resources.
4) Stop some compute nodes in cell A.
5) Confirm that the "Received capacities from child cell A" don't change.
6) Cell scheduler can send requests to cell A that can fail with "No valid
host".
To manage notifications about this bug go to:
https://bugs.launchpad.net/nova/+bug/1532562/+subscriptions
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