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LeaderEpoch

krabka_metadata

Struct LeaderEpoch

pub struct LeaderEpoch(pub i32);

Expand description

A partition leader epoch. KIP-320 wire type: int32.

This is a monotonic per-partition counter, and every leader change increments it. It fences stale leaders and it bounds follower log truncation. -1, the UNKNOWN_LEADER_EPOCH sentinel, is a valid wire value and round-trips as the inner i32. The type is ordered, so epochs compare directly. Advance to the next epoch with LeaderEpoch::next.

Note: the deterministic consensus core, krabka-kraft-core, tracks its own always-non-negative epoch as a u32, krabka_kraft_core::types::Epoch. krabka-raft converts to and from this wire type at the controller boundary.

Tuple Fields§

§0: i32

Implementations§

impl LeaderEpoch

pub const UNKNOWN: LeaderEpoch

KIP-320 UNKNOWN_LEADER_EPOCH (-1): the leader epoch is unknown or unset. Examples are an older client, and a partition with no elected leader yet.

pub const INITIAL: LeaderEpoch

The epoch a partition’s first leader starts at (0).

pub const fn get(self) -> i32

The inner i32. Use it at the wire and generated boundary.

pub const fn is_known(self) -> bool

Whether this is a real epoch rather than the UNKNOWN sentinel.

pub const fn next(self) -> LeaderEpoch

The next epoch after this one. A leader change increments the epoch by one.

Trait Implementations§

impl Clone for LeaderEpoch

fn clone(&self) -> LeaderEpoch

Returns a duplicate of the value. Read more

1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more

impl Copy for LeaderEpoch

impl Debug for LeaderEpoch

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

Formats the value using the given formatter. Read more

impl Default for LeaderEpoch

fn default() -> LeaderEpoch

Returns the “default value” for a type. Read more

impl<'de> Deserialize<'de> for LeaderEpoch

fn deserialize<D>( deserializer: D, ) -> Result<LeaderEpoch, <D as Deserializer<'de>>::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more

impl Display for LeaderEpoch

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

Formats the value using the given formatter. Read more

impl Eq for LeaderEpoch

impl From<i32> for LeaderEpoch

fn from(value: i32) -> LeaderEpoch

Converts to this type from the input type.

impl Hash for LeaderEpoch

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

Feeds this value into the given Hasher. Read more

1.3.0 · Source§

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

Feeds a slice of this type into the given Hasher. Read more

impl Ord for LeaderEpoch

fn cmp(&self, other: &LeaderEpoch) -> Ordering

This method returns an Ordering between self and other. Read more

1.21.0 (const: unstable) · Source§

fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more

1.21.0 (const: unstable) · Source§

fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more

1.50.0 (const: unstable) · Source§

fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized,

Restrict a value to a certain interval. Read more

impl PartialEq for LeaderEpoch

fn eq(&self, other: &LeaderEpoch) -> bool

Tests for self and other values to be equal, and is used by ==.

1.0.0 (const: unstable) · Source§

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 PartialEq<i32> for LeaderEpoch

fn eq(&self, other: &i32) -> bool

Tests for self and other values to be equal, and is used by ==.

1.0.0 (const: unstable) · Source§

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 PartialOrd for LeaderEpoch

fn partial_cmp(&self, other: &LeaderEpoch) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more

1.0.0 (const: unstable) · Source§

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator. Read more

1.0.0 (const: unstable) · Source§

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator. Read more

1.0.0 (const: unstable) · Source§

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator. Read more

1.0.0 (const: unstable) · Source§

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator. Read more

impl PartialOrd<i32> for LeaderEpoch

fn partial_cmp(&self, other: &i32) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more

1.0.0 (const: unstable) · Source§

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator. Read more

1.0.0 (const: unstable) · Source§

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator. Read more

1.0.0 (const: unstable) · Source§

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator. Read more

1.0.0 (const: unstable) · Source§

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator. Read more

impl Serialize for LeaderEpoch

fn serialize<S>( &self, serializer: S, ) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>
where S: Serializer,

Serialize this value into the given Serde serializer. Read more

impl StructuralPartialEq for LeaderEpoch

Auto Trait Implementations§

impl Freeze for LeaderEpoch

impl RefUnwindSafe for LeaderEpoch

impl Send for LeaderEpoch

impl Sync for LeaderEpoch

impl Unpin for LeaderEpoch

impl UnsafeUnpin for LeaderEpoch

impl UnwindSafe for LeaderEpoch

Blanket Implementations§

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🔬This is a nightly-only experimental API. (clone_to_uninit)

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