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Message #66386
[Bug 1708424] Re: When a flavor has resource extra_specs disabling all standard fields, nova tries to make a request to the placements API with no resources
So, this really seems like going out of the way to break the system. A
better error message would be fine if it was submitted, but this is very
unlikely to hit in the real world.
** Changed in: nova
Status: New => Opinion
** Changed in: nova
Importance: Undecided => Wishlist
** Tags added: placement
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https://bugs.launchpad.net/bugs/1708424
Title:
When a flavor has resource extra_specs disabling all standard fields,
nova tries to make a request to the placements API with no resources
Status in OpenStack Compute (nova):
Opinion
Bug description:
When a flavor is defined like:
+----------------------------+--------------------------------------------------------------------+
| Field | Value |
+----------------------------+--------------------------------------------------------------------+
| OS-FLV-DISABLED:disabled | False |
| OS-FLV-EXT-DATA:ephemeral | 0 |
| access_project_ids | None |
| disk | 0 |
| id | 2f41a9c0-f194-4925-81d2-b62a3c07435a |
| name | test2 |
| os-flavor-access:is_public | True |
| properties | resources:DISK_GB='0', resources:MEMORY_MB='0', resources:VCPU='0' |
| ram | 256 |
| rxtx_factor | 1.0 |
| swap | |
| vcpus | 1 |
+----------------------------+--------------------------------------------------------------------+
Then it will disable all the standard resources, and pop them from the
resources dictionary here:
https://github.com/openstack/nova/blob/57cd38d1fdc4d6b3439a8374e4713baf0b207184/nova/scheduler/utils.py#L141
the resources dictionary is then empty but nova still tries to use it
to make a request to the placements API. This results in a error
message like:
ERROR nova.scheduler.client.report [None req-030ec9a7-4299-47e0-bd38-b9d40721c210 admin admin] Failed to retrieve allocation candidates from placement API for filters {}. Got 400: <htm
Aug 03 12:40:11 qa-cld-m1-neo4 nova-scheduler[4057]: <head>
Aug 03 12:40:11 qa-cld-m1-neo4 nova-scheduler[4057]: <title>400 Bad Request</title>
Aug 03 12:40:11 qa-cld-m1-neo4 nova-scheduler[4057]: </head>
Aug 03 12:40:11 qa-cld-m1-neo4 nova-scheduler[4057]: <body>
Aug 03 12:40:11 qa-cld-m1-neo4 nova-scheduler[4057]: <h1>400 Bad Request</h1>
Aug 03 12:40:11 qa-cld-m1-neo4 nova-scheduler[4057]: The server could not comply with the request since it is either malformed or otherwise incorrect.<br /><br />
Aug 03 12:40:11 qa-cld-m1-neo4 nova-scheduler[4057]: Badly formed resources parameter. Expected resources query string parameter in form: ?resources=VCPU:2,MEMORY_MB:1024. Got: empty string.
Aug 03 12:40:11 qa-cld-m1-neo4 nova-scheduler[4057]: </body>
Aug 03 12:40:11 qa-cld-m1-neo4 nova-scheduler[4057]: </html>.
Nova should catch the case when the flavor has removed all filters and
provide a more useful error message to indicate what the operator as
done wrong.
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References
