[bind10-dev] component shutdown should handle hanging process

[Shane Kerr]

Michal,

On Thursday, 2012-10-25 19:55:22 +0200, 
Michal 'vorner' Vaner <michal.vaner at nic.cz> wrote:
> Hello
> 
> On Thu, Oct 25, 2012 at 09:47:35AM -0700, JINMEI Tatuya / 神明達哉
> wrote:
> > At Thu, 25 Oct 2012 09:56:17 -0500 (CDT),
> > "Jeremy C. Reed" <jreed at isc.org> wrote:
> > > 
> > > My b10-auth is hung:
> > > 
> > > > Auth shutdown
> > > {
> > >     "error": "Module 'Auth' not responding"
> > > }
> > > 
> > > So it can't get the "shutdown" command sent to it (via msgq).
> > > 
> > > Should boss then try to kill it?
> > > 
> > > or should we have something like the following?
> > > 
> > > Boss shutdown FOO
> > 
> > I think this (Boss) approach is more reasonable.
> 
> I don't know. I think we have two separate problems here. Or maybe
> three. It would be nice to solve them all, of course, but were low
> priority until now. 
>
> • The <component> shutdown should really be hidden. This is internal
> command and is not expected to by called by user (partly because it
> doesn't do what one would expect, since the component gets restarted
> immediately).

True, we have an open ticket for that:

http://bind10.isc.org/ticket/789

We can put on next-sprint-proposed if it seems worthy of fixing now.

> • There's no way to „disable“ a component in boss. It can be only
> removed from the configuration, with all the settings on how to start
> it.

See also this ticket:

http://bind10.isc.org/ticket/795

I agree we should have a way to disable a component. Does this already
exist as a ticket?

> • If the boss wants to shut down a component and it is stuck, it just
> fails to do so and gets stuck in the state where it is trying to shut
> it down for ever.

Probably we should use the same logic here as we use when the system is
shutting down.

> Of course, we should never have anything stuck in the first place O:-)

That's why we use C++, because we choose simply never to make any
mistakes. ;)

Cheers,

--
Shane
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