nova/releasenotes/notes/neutron-connection-retries-...

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---
fixes:
- |
A new config option ``[neutron]http_retries`` is added which defaults to
3. It controls how many times to retry a Neutron API call in response to a
HTTP connection failure. An example scenario where it will help is when a
deployment is using HAProxy and connections get closed after idle time. If
an incoming request tries to re-use a connection that is simultaneously
being torn down, a HTTP connection failure will occur and previously Nova
would fail the entire request. With retries, Nova can be more resilient in
this scenario and continue the request if a retry succeeds. Refer to
https://launchpad.net/bugs/1866937 for more details.