"Migration for instance 0763227e-e192-4e0b-a49d-0ea0b181fca6 refers to another host's instance!" should not be an error

[Matt Riedemann]

This happens in a periodic task after migrations complete:

http://logs.openstack.org/15/290715/1/check/gate-tempest-dsvm-multinode-full/03f92ff/logs/screen-n-cpu.txt.gz?level=INFO#_2016-03-09_18_09_00_775

http://logs.openstack.org/15/290715/1/check/gate-tempest-dsvm-multinode-full/03f92ff/logs/screen-n-cpu.txt.gz?level=INFO#_2016-03-09_18_09_01_748

It shouldn't be an error log since it's normal, see how many times it hits in multinode gate runs:

http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22Migration%20for%20instance%5C%22%20AND%20message%3A%5C%22refers%20to%20another%20host's%20instance!%5C%22%20AND%20tags%3A%5C%22screen-n-cpu.txt%5C%22&from=7d

There are over 2500 hits in 7 days on this error message.

[Pushkar Umaranikar (pushkar-umaranikar)]

Added a debug patch to trace the incorrect error logs at gates. Here is the review url : https://review.openstack.org/#/c/298099/
Some test cases are failed for debug patch. but I don't think that are relevant to this problem. I think the failure is only because of the code snippet I have added. Any more suggestions to reproduce this problem would be helpful. Thanks in advance.

[Pawel Koniszewski (pawel-koniszewski)]

There is no progress for at least 8 weeks so I'm changing status back to confirmed. If you are still working on this please re-assign yourself.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/382195

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/382195
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=f085fbd7d3bfdf016a37ccc7e6e28786425f0e4e
Submitter: Jenkins
Branch: master

commit f085fbd7d3bfdf016a37ccc7e6e28786425f0e4e
Author: Timofey Durakov <email address hidden>
Date: Tue Oct 4 16:42:09 2016 +0300

    Change log level to debug for migrations pairing

    For resize/cold-migration it's possible that instance
    already changed host to destination, but no confirm/revert
    has happened yet. In that case resource tracked starts spamming
    errors, because it's impossible to match migration and instance.
    It's safe to lower log level to debug in that case.

    Change-Id: I70cb7426e0e2849ee7d01205ce7b2d883a126d66
    Closes-Bug: #1555320

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/newton
Review: https://review.openstack.org/384910

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/384910
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=118e1590f9deb3755aa7045c77cda7485d38e4a4
Submitter: Jenkins
Branch: stable/newton

commit 118e1590f9deb3755aa7045c77cda7485d38e4a4
Author: Timofey Durakov <email address hidden>
Date: Tue Oct 4 16:42:09 2016 +0300

    Change log level to debug for migrations pairing

    For resize/cold-migration it's possible that instance
    already changed host to destination, but no confirm/revert
    has happened yet. In that case resource tracked starts spamming
    errors, because it's impossible to match migration and instance.
    It's safe to lower log level to debug in that case.

    Change-Id: I70cb7426e0e2849ee7d01205ce7b2d883a126d66
    Closes-Bug: #1555320
    (cherry picked from commit f085fbd7d3bfdf016a37ccc7e6e28786425f0e4e)

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/mitaka
Review: https://review.openstack.org/387887

[OpenStack Infra (hudson-openstack)]

Change abandoned by Roman Podoliaka (<email address hidden>) on branch: stable/mitaka
Review: https://review.openstack.org/387887
Reason: too late for stable/mitaka

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/nova 14.0.2 release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/nova 15.0.0.0b1 development milestone.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/nova 14.0.2 release.