gen leader

Jeffrey M. Einhorn <>
Wed May 5 15:22:17 CEST 2004


Thomas,
	The ability of the gen_leader to work in single node environment is
particularly useful to us when we run unit/acceptance tests, which
frequently test only one node at a time.
	thanks for your time,
		-jeff einhorn

On Wed, 2004-05-05 at 04:53, Thomas Arts wrote:
> Dear Martin
> 
> I am very glad to read that you can actually use the gen_leader code
> and that it works fine for you. A while ago I posted a warning that there
> still is a bug in the code that might cause you a daedlock, but we are
> near to having a fix for that. New code has been written based on a
> different algorithm (Scott D Stroller, "Leader Election in Distributed
> Systems
> with Crash Failures, 1997). We are verifying the code at the moment,
> not to make the same mistake again :0).
> 
> The reason why we excluded the one node case for the leader
> election algorithm is that we saw it as an implementation to
> support fault tolerance. In case of 1 node, there is no fault
> tolerance and a leader election for it seemed useless to us.
> 
> Best regards
> Thomas
> 
> 
> ---
> Dr Thomas Arts
>      Program Manager
>      Software Engineering and Management
> IT-university in Gothenburg
> Box 8718, 402 75 Gothenburg, Sweden
> http://www.ituniv.se/
> 
> Tel +46 31 772 6031
> Fax +46 31 772 4899
> 
> 
> ----- Original Message ----- 
> From: "Martin J. Logan" <>
> To: <>
> Sent: Tuesday, May 04, 2004 6:31 PM
> Subject: gen leader
> 
> 
> > This message is directed at the authors of gen_leader. I have been
> > playing with the gen_leader code of jungerl fame. This code is just what
> > is needed obviate all of our "global" problems. I do have one question
> > about the gen_leader code. If I start a gen_leader in a node cluster
> > consisting of a single node() the single gen_leader process will not
> > elect itself leader. I have to fake it by saying
> > gen_leader:start_link(leader, [node(), fake_node], [],
> > gen_leader_callback, Args, Options).
> >
> > What is the reason that gen_leader wants another gen_leader to dominate
> > and is not content to be his own boss:-)
> >
> > Cheers,
> > Martin
> >
> > P.S how does jungerl become erlpan i.e more people know, love, and use
> > it?
> >
> >




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