Struct PowerOfTwoChoices 

pub struct PowerOfTwoChoices;

Power of Two Choices: randomly pick two nodes, select the one with lower load.

Provides near-optimal load distribution with O(1) selection time, a significant improvement over pure random while avoiding the overhead of scanning all nodes like LeastLoad.

When fewer than two candidates are eligible, the sole eligible node is returned directly.

Implementations

impl PowerOfTwoChoices

pub fn new() -> Self

Trait Implementations

impl Debug for PowerOfTwoChoices

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for PowerOfTwoChoices

fn default() -> Self

Returns the “default value” for a type.

impl<N: LoadMetric> Strategy<N> for PowerOfTwoChoices

fn select(&self, candidates: &[N], ctx: &SelectionContext) -> Option<usize>

Pick the next node. Returns None when candidates is empty or all candidates are excluded via SelectionContext::exclude.