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Leader Election
Each group can elect its own leader. There can be only one leader at a time in a group. Only members that are running for the election can be elected. As soon as one of leader steps down or dies, a new member that was running for the election will be elected.
../../../../examples/leader_election.py
The method tooz.coordination.CoordinationDriver.watch_elected_as_leader
allows to register for a function to be called back when the member is
elected as a leader. Using this function indicates that the run is
therefore running for the election. The member can stop running by
unregistering all its callbacks with tooz.coordination.CoordinationDriver.unwatch_elected_as_leader.
It can also temporarily try to step down as a leader with tooz.coordination.CoordinationDriver.stand_down_group_leader.
If another member is in the run for election, it may be elected
instead.
To retrieve the leader of a group, even when not being part of the
group, the method tooz.coordination.CoordinationDriver.get_leader() can
be used.