Enum MemberState 

pub enum MemberState {
    Active,
    Draining,
}

A member’s lifecycle state in the cluster (issue #1000, PRD #987).

A member is Active for its whole serving life; planned removal first marks it Draining via MembershipCatalog::begin_drain. The distinction drives two rules of the cluster drain flow (super::drain): a draining member stops receiving new range placements, and its ranges are scheduled off it through ordinary ownership transitions before membership is finally removed. The state is cluster-membership lifecycle, separate from per-range health (HealthClass): a draining member can be perfectly healthy, and an unhealthy member is not automatically draining.

Variants

Active

Fully serving: may own and replicate ranges and receive new placements.

Draining

Marked for planned removal: holds its current ranges until they are moved off, but receives no new range placements. The terminal state before the member is removed from the catalog.

Implementations

impl MemberState

pub fn accepts_new_placements(self) -> bool

Whether a member in this state may receive new range placements. Only an Active member may; a draining member is excluded so drain never has to chase ranges it just handed back. This is the “a draining member stops receiving new range placements” rule.

Trait Implementations

impl Clone for MemberState

fn clone(&self) -> MemberState

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for MemberState

impl Debug for MemberState

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

Formats the value using the given formatter.

impl Eq for MemberState

impl PartialEq for MemberState

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