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

[Scott Barvick]

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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