Struct PlacementPolicy 

pub struct PlacementPolicy {
    pub balance_tolerance: f64,
    pub hotspot_load_factor: f64,
}

The tunables that gate when imbalance and traffic are worth a move.

The defaults are deliberately slack: a cluster within 10% of its fair share is “balanced enough” not to churn ownership, and a hotspot must run at 2× the cluster-mean traffic before it is worth spreading. Tight thresholds would make the planner thrash on noise.

Fields

balance_tolerance: f64

Fractional tolerance around a member’s fair share. A member is “over” only when its bytes-used exceeds fair * (1 + balance_tolerance); a move’s target must have room under fair * (1 + balance_tolerance). Larger values tolerate more imbalance for less churn.

hotspot_load_factor: f64

How many times the cluster-mean range traffic a range must serve to count as a hotspot. 2.0 means “twice the average”.

Trait Implementations

impl Clone for PlacementPolicy

fn clone(&self) -> PlacementPolicy

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for PlacementPolicy

impl Debug for PlacementPolicy

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

Formats the value using the given formatter.

impl Default for PlacementPolicy

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for PlacementPolicy

fn eq(&self, other: &PlacementPolicy) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for PlacementPolicy