[Spread-users] MembershipInfo: is there a way to determine a leader, or oldest member of a group?

[Jonathan Stanton]

The order in 3.17.3 is the same as all previous releases. The only 
change is in the new CVS HEAD branch (which will become spread 4.0) 
which has a new ordering as Ryan describes. 

Cheers,

Jonathan

On Tue, Apr 26, 2005 at 08:53:23AM -0400, Scott Barvick wrote:
> Ryan,
> 
> Just to clarify, was the ordering policy different prior to 3.17.3?  We
> are just upgrading now so I wanted to know if we should expect
> differences.
> 
> Thanks,
> Scott
> 
> On Mon, 2005-04-25 at 20:15, Ryan Caudy wrote:
> > Regular Membership Messages contain the list of the group members in a
> > deterministic order.  The order is not based on when the members
> > joined.
> > 
> > In 3.17.3, and that CVS branch, the order is alphabetic by private group name.
> > 
> > In the CVS head, the order is first by the daemon to which the members
> > are connected, and second by private group name of the member.  So, if
> > daemon A is listed in the configuration file before daemon B, you have
> > all the members from daemon A ordered by private name, followed by all
> > the members from daemon B ordered by private name.
> > 
> > A member knows if it's the first to join if the Regular Membership
> > Message that immediately follows it's join contains only that member. 
> > The group may have existed in the past and since become empty, but
> > there's no history to determine that.
> > 
> > A simple way to choose a new leader is to choose the member at the top
> > of the members list.  The common way to follow this strategy is to
> > change the leader to match this top member for each membership change.
> > 
> > Cheers,
> > Ryan
> > 
> > On 4/25/05, Laran Evans <laran.evans at gmail.com> wrote:
> > > Is there a way for me to determine whether or not I'm the first member
> > > of a SpreadGroup? I need a way to determine a leader essentially. The
> > > first process to join the group needs to do something at startup. From
> > > then on, if the leader dies, whomever is the first member of the group
> > > will become the leader and upon discovering this will do what the
> > > leader did at startup.
> > > 
> > > Many Thanks.
> > > 
> > > --
> > > -- Laran Evans
> > > 
> > > _______________________________________________
> > > Spread-users mailing list
> > > Spread-users at lists.spread.org
> > > http://lists.spread.org/mailman/listinfo/spread-users
> > >
> > 
> > _______________________________________________
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> > Spread-users at lists.spread.org
> > http://lists.spread.org/mailman/listinfo/spread-users
> 
> 
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-- 
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Jonathan R. Stanton         jonathan at cs.jhu.edu
Dept. of Computer Science   
Johns Hopkins University    
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