Struct Election 

pub struct Election {
    pub epoch: u64,
    /* private fields */
}

State for an in-progress automatic failover election.

Created when a replica detects its primary has failed. Discarded when the election succeeds (promotion triggered) or times out.

Fields

epoch: u64

Config epoch this election is contesting.

Implementations

impl Election

pub fn new(epoch: u64) -> Self

Creates a new election for the given epoch.

pub fn record_vote(&mut self, from: NodeId, total_primaries: usize) -> bool

Records a vote from from. Returns true if quorum is newly reached.

total_primaries is the number of alive primaries (excluding the failed one) at the time the election started. Quorum is a simple majority: total_primaries / 2 + 1.

Once quorum is reached this returns true exactly once; subsequent calls return false so the caller promotes exactly once.

pub fn quorum(total_primaries: usize) -> usize

Minimum votes required for a majority.

pub fn is_promoted(&self) -> bool

Returns true if this election has already succeeded.