Juju Charms Collection
nova-cloud-controller package

  1. Bug #1335139
  2. Comment #5

Comment 5 for bug 1335139

Revision history for this message
Adam Collard (adam-collard) wrote : Re: [Bug 1335139] Re: nova-cloud-controller db sync fails in HA mode

On 23 July 2014 14:01, James Page <email address hidden> wrote:

> The 'eligible_leader' function does a few checks
>
> 1) if fully clustered, then the owner of the VIP is the leader
> 2) if not fully clustered, the oldest service unit in the 'cluster'
> relation is declared the leader
>
> If in the event of 2) the cluster relation is not fully formed with all
> service units prior to the shared-db relation being made, I could see
> how 2 nova-cc units both think they are the leader and you hit a race;
> do you see the db sync being run on multiple service units?
>

Yes.

Given it's not possible for a user of the Juju API to know when a relation
is "fully formed" I'm not sure if/how we can work around this.