Enum ReplicaAckPolicy 

pub enum ReplicaAckPolicy {
    All,
    SimpleMajority,
    None,
}

Policy for how many replicas must acknowledge a commit before it is considered durable.

Variants

All

All electable replicas must acknowledge the commit.

SimpleMajority

A simple majority of electable nodes (including the master) must acknowledge the commit.

None

No replica acknowledgment is required. The commit returns as soon as the master has written it locally.

Implementations

impl ReplicaAckPolicy

pub fn required_acks(&self, electable_count: u32) -> u32

Returns the number of acknowledgments required for the given number of electable nodes in the group.

• All: requires electable_count - 1 acks (all replicas).
• SimpleMajority: requires (electable_count / 2 + 1) - 1 acks (majority minus the master itself).
• None: requires 0 acks.

Trait Implementations

impl Clone for ReplicaAckPolicy

fn clone(&self) -> ReplicaAckPolicy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ReplicaAckPolicy

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

Formats the value using the given formatter.

impl Default for ReplicaAckPolicy

fn default() -> ReplicaAckPolicy

Returns the “default value” for a type.

impl Display for ReplicaAckPolicy

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

Formats the value using the given formatter.

impl Hash for ReplicaAckPolicy

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for ReplicaAckPolicy

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

impl Eq for ReplicaAckPolicy

impl StructuralPartialEq for ReplicaAckPolicy