Testing Leader Election reconfiguration

[Tim Van Steenburgh]

On Wed, Mar 9, 2016 at 6:31 AM, Tom Barber <tom at analytical-labs.com> wrote:

> Thanks Stuart.
>
> I do put a note in my charm message indicating the leader IP address so
> that users know which to connect to.
>
> So with juju wait, would I destroy a unit then execute juju wait? At which
> point it will hang until the leader election stuff is over and all becomes
> stable again?
>
>
Since you're already using amulet, there's no need to use the juju-wait
plugin
since d.sentry.wait() does the same thing. So yes, you would do
d.remove_unit(...)
and then call d.sentry.wait().


> Also, will this work if I push it upstream to the charmers and the
> automated tests up there?
>
>
Yes.


> Thanks
>
> Tom
>
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> On 9 March 2016 at 11:00, Stuart Bishop <stuart.bishop at canonical.com>
> wrote:
>
>> On 9 March 2016 at 20:31, Tom Barber <tom at analytical-labs.com> wrote:
>> > Morning all
>> >
>> > I'm trying to test for charm reconfiguration if the leader goes AWOL.
>>
>> I put the role of the unit in its workload status, so it is easy for
>> operators to see which unit is master. And this also makes it easy for
>> tests to tell.
>>
>>
>> > Adam suggested that I watch the status waiting for the next leader
>> election
>> > hook the wait on that and then check my service configs.
>>
>> You are best of waiting for all the hooks to complete and a steady
>> state, not just leader elected (since things will still be in flux
>> when that hook fires, such as the leader-settings-changed hooks it
>> will probably trigger and the relation changes those hooks will likely
>> trigger). Use the juju-wait plugin, and maybe add support to
>> https://bugs.launchpad.net/juju-core/+bug/1488777 to get this into
>> core.
>>
>> --
>> Stuart Bishop <stuart.bishop at canonical.com>
>>
>
>
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