nova-scheduler: UnicodeDecodeError in host aggregates handling

[Roman Bogorodskiy]

nova-scheduler doesn't seem to like when there are non-asci characters in the host aggregate objects.

Steps to reproduce:

1. Create a host aggregate with some non-asci chars in properties, e.g.:

$ openstack aggregate show test_aggr
+-------------------+----------------------------------------------+
| Field | Value |
+-------------------+----------------------------------------------+
| availability_zone | nova |
| created_at | 2016-09-09T17:31:12.000000 |
| deleted | False |
| deleted_at | None |
| hosts | [u'node-6.domain.tld', u'node-7.domain.tld'] |
| id | 54 |
| name | test_aggr |
| properties | test_meta='проверка мета' |
| updated_at | None |
+-------------------+----------------------------------------------+

2. Start an instance

Expected result: instance started.
Actual result: instance creating failed, exception in the nova-scheduler.log attached.

This is reproducible with Mitaka, didn't try master.

[Matt Riedemann (mriedem)]

Yeah the failure is logging the aggregates here:

https://github.com/openstack/nova/blob/fe21d29fa8b02f3e6437f035b0af6c58f8f454bb/nova/scheduler/host_manager.py#L171

With the unicode. This is similar to bug 1514325.

[Andrey Volkov (avolkov)]

With high probability, it's related to oslo.log library bug https://bugs.launchpad.net/oslo.log/+bug/1563295.

I prepared backport to upstream stable mitaka https://review.openstack.org/371582
which should fix the issue.

[Sam Morrison (sorrison)]

We have started to see this in Pike