Feature Request: -about-to-depart hook

[Cheryl Jennings]

This is already on my list.  I'm still figuring out a good way to organize
/ record these in a publicly viewable place.

I'll send out a link once I get something together.  (Hopefully tonight!)

Thanks!
-Cheryl
On Nov 23, 2015 5:20 PM, "Rick Harding" <rick.harding at canonical.com> wrote:

> Thanks for the feedback. I think this is something we should try to make
> some time for. I've copied Alexis and we'll see what can be done with the
> team.
>
> Alexis, can you put this on the list of things to investigate for future
> roadmap?
>
> Thanks
>
> On Tue, Nov 10, 2015 at 8:22 AM Mario Splivalo <
> mario.splivalo at canonical.com> wrote:
>
>> On 02/12/2015 07:41 PM, Jorge Niedbalski wrote:
>> >> While typing up https://bugs.launchpad.net/juju-core/+bug/1417874 I
>> >> realized that your proposed solution of a pre-departure hook is the
>> >> only one that can work. Once -departed hooks start firing both the
>> >> doomed unit and the leader have already lost the access needed to
>> >> decommission the departing node.
>> >
>> > I have been struggling the last hours with the same exact issue trying
>> > to add replication to memcached.
>> >
>> > The problem is that there is no a point on which i can identify
>> > what's the exact departing unit?
>> >
>> > And this leads to manual operator intervention, which is _highly_ non
>> > desirable for a juju deployed environment.
>> >
>> > +1 for having this feature implemented.
>>
>> Hola!
>>
>> I'm bumping this thread to get some chatter going on - we hit a similar
>> issue with percona-cluster charm, which is reported in this bug:
>>
>> https://bugs.launchpad.net/charms/+source/percona-cluster/+bug/1514472
>>
>> The issue is somewhat similar as to those with mongodb - when unit is
>> leaving relation (issued by 'juju remove-unit'), charm should first shut
>> down percona server on the departing unit. Failing to do results in
>> 'lost quorum' situation where remaining node thinks that network has
>> partitioned. Unfortunately there is now way for a relation's -departed
>> hook to know if it's executing on departing unit or on the other one so
>> it can't know weather or not to stop percona server. Implementing a
>> -about-to-depart hook would solve this issue.
>>
>>         Mario
>>
>>
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