magnum-conductor raise db_exc.DBDuplicateEntry when to start multiple processes concurrently

[Wang Bo]

ENV：
[root@node-1 ~]# lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 32
On-line CPU(s) list: 0-31
Thread(s) per core: 2
Core(s) per socket: 8
Socket(s): 2
NUMA node(s): 2

================================

conductor.log：
2017-07-09 00:10:13.553 61213 ERROR oslo_service.periodic_task [-] Error during MagnumServicePeriodicTasks.update_magnum_service
2017-07-09 00:10:13.553 61213 ERROR oslo_service.periodic_task Traceback (most recent call last):
2017-07-09 00:10:13.553 61213 ERROR oslo_service.periodic_task File "/usr/lib/python2.7/site-packages/oslo_service/periodic_task.py", line 220, in run_periodic_tasks
2017-07-09 00:10:13.553 61213 ERROR oslo_service.periodic_task task(self, context)
2017-07-09 00:10:13.553 61213 ERROR oslo_service.periodic_task File "/usr/lib/python2.7/site-packages/magnum/service/periodic.py", line 42, in handler
2017-07-09 00:10:13.553 61213 ERROR oslo_service.periodic_task File "/usr/lib/python2.7/site-packages/magnum/servicegroup/magnum_service_periodic.py", line 54, in update_magnum_service
2017-07-09 00:10:13.553 61213 ERROR oslo_service.periodic_task File "/usr/lib/python2.7/site-packages/oslo_versionedobjects/base.py", line 223, in wrapper
2017-07-09 00:10:13.553 61213 ERROR oslo_service.periodic_task return fn(self, *args, **kwargs)
2017-07-09 00:10:13.553 61213 ERROR oslo_service.periodic_task File "/usr/lib/python2.7/site-packages/magnum/objects/magnum_service.py", line 101, in create
2017-07-09 00:10:13.553 61213 ERROR oslo_service.periodic_task File "/usr/lib/python2.7/site-packages/magnum/db/sqlalchemy/api.py", line 915, in create_magnum_service
2017-07-09 00:10:13.553 61213 ERROR oslo_service.periodic_task MagnumServiceAlreadyExists: A magnum service with ID None already exists.
2017-07-09 00:10:13.553 61213 ERROR oslo_service.periodic_task

we have enable multiple workers of magnum-conductor that result in different processes save same DB entry concurrently.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/494473

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/pike
Review: https://review.openstack.org/497148

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/494473
Committed: https://git.openstack.org/cgit/openstack/magnum/commit/?id=c22f9cd882cd899b0e25796c40da67960d7a038d
Submitter: Jenkins
Branch: master

commit c22f9cd882cd899b0e25796c40da67960d7a038d
Author: chestack <[e-mail]>
Date: Thu Aug 17 18:05:02 2017 +0800

    Deal with db_exc.DBDuplicate of conductor startup

    we have enable multiple workers of magnum-conductor that
    result in multiple processes save same DB entry concurrently.

    This patch logs warning message instead of raising exception

    Change-Id: I548d50bed5d80e96042f88039e880075e1bffc53
    Close-Bug: #1711324

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/497148
Committed: https://git.openstack.org/cgit/openstack/magnum/commit/?id=a8fe48685d7775e9dc439de08c1431ccdbacf8a9
Submitter: Jenkins
Branch: stable/pike

commit a8fe48685d7775e9dc439de08c1431ccdbacf8a9
Author: chestack <[e-mail]>
Date: Thu Aug 17 18:05:02 2017 +0800

    Deal with db_exc.DBDuplicate of conductor startup

    we have enable multiple workers of magnum-conductor that
    result in multiple processes save same DB entry concurrently.

    This patch logs warning message instead of raising exception

    Change-Id: I548d50bed5d80e96042f88039e880075e1bffc53
    Close-Bug: #1711324