Re: [Devmon] [hobbit] RE: Devmon Turning Purple

[Buchan M. <bg...@st...>]

On Wednesday 05 March 2008 16:41:05 Whilding, Craig wrote:
> I've discovered something with this purple problem. If the module that
> parses hobbit client data isn't running then devmon seems to remain
> fine.
>
> Basically on one of our servers that runs a proxy sending data to
> localhost and our main server one of the modules has died so that no
> linux client data gets to the local display. Haven't quite worked out
> what will have died yet as I need to run a diff with another box to
> check the dead channel but whatever it was it seems to be the service
> that devmon disagreed with.
>
> Any progress on debugging what devmon code causes the problem in the
> first place? I can leave this broken for now on mine as the local
> display is only a backup if the wan link fails.

I managed to reproduce the issue, and I think it is fixed with this commit:

http://devmon.svn.sourceforge.net/devmon/?rev=82&view=rev

I will test it in production (but I see this issue about once in two weeks in 
our production environment) this week.

I reproduced it by stopping hobbit after devmon had sent at least one status 
message (i.e. start devmon while hobbit is running), then stopping hobbitit 
before the next attempt to send a status message. devmon would hang, and log 
nothing more to the log. With the fix available in the patch from the url 
above, it will continue logging and running.

I have also fixed the "don't poll a device hobbit thinks is down" feature. If 
there aren't any more serious issues to resolve, I think another release is 
in order ... maybe 0.3.0 final.

Regards,
Buchan