octavia/releasenotes/notes/refactor_failover_flow-9efcd854240f71ad.yaml
Michael Johnson 955bb88406 Refactor the failover flows
This patch refactors the failover flows to improve the performance
and reliability of failovers in Octavia.

Specific improvements are:
* More tasks and flows will retry when other OpenStack services are
  failing.
* Failover can now succeed even when all of the amphora are missing
  for a given load balancer.
* It will check and repair the load balancer VIP should the VIP
  port(s) become corrupted in neutron.
* It will cleanup extra resources that may be associated with a
  load balancer in the event of a cloud service failure.

This patch also removes some dead code.

Change-Id: I04cb2f1f10ec566298834f81df0cf8b100ca916c
Story: 2003084
Task: 23166
Story: 2004440
Task: 28108
2020-06-18 16:25:21 -07:00

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---
upgrade:
- |
The failover improvements do not require an updated amphora image,
but updating existing amphora will minimize the failover
outage time for standalone amphora on subsequent failovers.
fixes:
- |
Significantly improved the reliability and performance of amphora
and load balancer failovers. This is especially true when the
Nova service is experiencing failures.