Struct MemberCapacity 

pub struct MemberCapacity {
    pub usable_disk_bytes: u64,
    pub operator_weight: u32,
}

A member’s advertised placement capacity: how much usable disk it offers and the operator’s weight multiplier on top of it.

The two combine into the member’s weighted_capacity — its share of the cluster it is meant to hold. Advertising more usable disk, or a higher operator weight, raises that share; the planner then apportions ranges toward it on the next plan. The struct is pure advertised state: it records what a member offers, never moves anything by itself.

Fields

usable_disk_bytes: u64

Usable disk the member advertises for user ranges, in bytes.

operator_weight: u32

Operator weight in hundredths (NEUTRAL_OPERATOR_WEIGHT = 1.0×). Lets an operator bias placement on or off a member without misreporting disk.

Implementations

impl MemberCapacity

pub fn new(usable_disk_bytes: u64, operator_weight: u32) -> MemberCapacity

Capacity with an explicit usable disk and operator weight.

pub fn with_disk(usable_disk_bytes: u64) -> MemberCapacity

Capacity from usable disk alone, at the neutral operator weight — the common case where the operator has expressed no preference.

pub fn weighted_capacity(&self) -> u128

The member’s placement weight: usable disk scaled by the operator weight. This is the value the rebalancer apportions the cluster’s bytes by, and it is exactly what expanding a member’s disk changes — a larger disk (or a higher operator weight) yields a larger weighted capacity and so a larger fair share on the next plan. Computed in u128 so a large disk times a large weight cannot overflow.

pub fn is_placeable(&self) -> bool

Whether this member can hold any ranges at all — a member advertising no usable disk (or a zero operator weight) has zero weighted capacity and is never a placement target.

Trait Implementations

impl Clone for MemberCapacity

fn clone(&self) -> MemberCapacity

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for MemberCapacity

impl Debug for MemberCapacity

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

Formats the value using the given formatter.

impl Eq for MemberCapacity

impl PartialEq for MemberCapacity

fn eq(&self, other: &MemberCapacity) -> 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 MemberCapacity