juju HA primary controller machine concept

[Anastasia]

Currently, Juju gives no indication which controller machine in HA is primary.
From Juju perspective the concept is not necessarily useful as any controller machine can accept request and correctly pass them to a primary mongo instance.

However, sometimes it's important for the users to know which controller machine has a local mongo instance which is primary in a replicaset.

We should surface it in a status.

[Richard Harding (rharding)]

Should it be in status? HA status is in the show-controller output and I'd think that, for the most part, status of that doesn't need much attention unless you were looking for it. Maybe we can tack the primary indicator to the existing data?

juju show-controller

  controller-machines:
    "0":
      instance-id: juju-b882a2-0
      ha-status: ha-enabled
    "1":
      instance-id: juju-b882a2-1
      ha-status: ha-enabled
    "2":
      instance-id: juju-b882a2-2
      ha-status: ha-enabled

[Anastasia (anastasia-macmood)]

TBH, it should be in both - 'status' and 'show-controller' output. 'status' in yaml and json also shows the state of controller machines voting 'hasVote', 'wantsVote', etc.

So I was going to add 'ha-primary: true' or something along these lines.

[Richard Harding (rharding)]

Fair enough on the status YAML output. Thanks, appreciate it.

On Mon, Jan 20, 2020 at 5:20 PM Anastasia <email address hidden>
wrote:

> TBH, it should be in both - 'status' and 'show-controller' output.
> 'status' in yaml and json also shows the state of controller machines
> voting 'hasVote', 'wantsVote', etc.
>
> So I was going to add 'ha-primary: true' or something along these lines.
>
> --
> You received this bug notification because you are subscribed to juju.
> https://bugs.launchpad.net/bugs/1860291
>
> Title:
> juju HA primary controller machine concept
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/juju/+bug/1860291/+subscriptions
>

[Anastasia (anastasia-macmood)]

PR against develop (heading into 2.8): https://github.com/juju/juju/pull/11131