Slaves starting while master still running

[Christian Schneider <ch...@die-schneider.net>]

We use the file based locking for a master/slave setup of activemq with 
NFSv4 as filer for the kahadb.

We recently had a production problem where slaves were booting up while 
the master was still running.
The lock file was still present but I assume that the nfs lock was 
somehow lost.

Does anyone know in what circumstances this can happen and how to 
diagnose and ideally avoid it?

Christian

-- 
Christian Schneider
http://www.liquid-reality.de

Open Source Architect
http://www.talend.com

Re: Slaves starting while master still running

[Tim Bain <tb...@alumni.duke.edu>]

There are a number of threads about the problem in the archives of this
mailing list.
On Jun 27, 2016 3:03 AM, "Christian Schneider" <ch...@die-schneider.net>
wrote:

> We use the file based locking for a master/slave setup of activemq with
> NFSv4 as filer for the kahadb.
>
> We recently had a production problem where slaves were booting up while
> the master was still running.
> The lock file was still present but I assume that the nfs lock was somehow
> lost.
>
> Does anyone know in what circumstances this can happen and how to diagnose
> and ideally avoid it?
>
> Christian
>
> --
> Christian Schneider
> http://www.liquid-reality.de
>
> Open Source Architect
> http://www.talend.com
>
>