Enum NodeHealth 

pub enum NodeHealth {
    Healthy,
    Degraded,
    Transitioning,
    Unhealthy,
}

Node health state for graceful degradation during failover

This enum enables the load balancer to handle intermediate states during failover, allowing for graceful degradation rather than binary healthy/unhealthy transitions.

Variants

Healthy

Node is operating normally - can serve all traffic

Degraded

Node is degraded (high latency or replication lag) but still usable for reads

Transitioning

Node is transitioning (failover in progress) - hold new requests

Unhealthy

Node is down or unreachable - do not route traffic

Implementations

impl NodeHealth

pub fn can_serve_reads(&self) -> bool

Check if node can serve read requests

pub fn can_serve_writes(&self) -> bool

Check if node can serve write requests

pub fn is_usable(&self) -> bool

Check if node is in a usable state

Trait Implementations

impl Clone for NodeHealth

fn clone(&self) -> NodeHealth

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NodeHealth

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

Formats the value using the given formatter.

impl Default for NodeHealth

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for NodeHealth

fn eq(&self, other: &NodeHealth) -> 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 Copy for NodeHealth

impl Eq for NodeHealth

impl StructuralPartialEq for NodeHealth