Enum ConfigState 

pub enum ConfigState {
    Stable(ClusterConfig),
    Joint {
        old: ClusterConfig,
        new: ClusterConfig,
    },
}

The state of cluster configuration during membership changes.

Implements the Raft joint consensus protocol (Section 6):

• Stable: Normal operation with a single configuration
• Joint: Transitional state requiring majority from BOTH old and new configs

Variants

Stable(ClusterConfig)

Normal operation with a single configuration

Joint

Joint consensus: decisions require majority of both old and new configs

Fields

old: ClusterConfig

The old (current) configuration

new: ClusterConfig

The new (target) configuration

Implementations

impl ConfigState

pub fn new_stable(members: Vec<(NodeId, String)>) -> Self

Create a new stable config state

pub fn all_member_ids(&self) -> HashSet<NodeId>

Get all unique member node IDs across both configs (if joint)

pub fn is_joint(&self) -> bool

Check if we are in joint consensus

pub fn version(&self) -> u64

Get the current version (max of both configs if joint)

pub fn has_quorum(&self, responding_nodes: &HashSet<NodeId>) -> bool

Check if a given set of responding nodes forms a quorum.

During joint consensus, a quorum requires majority in BOTH the old and new configurations independently.

pub fn stable_config(&self) -> Option<&ClusterConfig>

Get the stable config (only valid if not in joint state)

pub fn all_members(&self) -> Vec<(NodeId, String)>

Get all members as (node_id, address) pairs

Trait Implementations

impl Clone for ConfigState

fn clone(&self) -> ConfigState

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ConfigState

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

Formats the value using the given formatter.

impl PartialEq for ConfigState

fn eq(&self, other: &ConfigState) -> 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 Eq for ConfigState

impl StructuralPartialEq for ConfigState