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

[Laran Evans]

Adding a leadership mechanism on top of Spread turned out to be
trivial. The trickiest part was getting the names correct (the
#pname#gname format).

- Laran

On 4/26/05, Jonathan Stanton <jonathan at cnds.jhu.edu> wrote:
> 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
> > > >
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> > > >
> > >
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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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> 


-- 
-- Laran Evans