Enum DurabilityTier 

pub enum DurabilityTier {
    Memory,
    Lossy,
    Soft,
    Strong,
}

Durability tier from @store(durability:).

Monotonically increasing in cost and decreasing in crash-loss window. See the design doc for the per-tier semantics and the crash-loss windows.

Variants

Memory

"memory" — BackendType::InMemory, nothing survives restart.

Lossy

"lossy" — RocksDB with WAL disabled (disable_wal = true). Survives clean restart; loses up to a memtable flush window (~minutes) on crash.

Soft

"soft" — RocksDB with WAL on, OS-controlled fsync (sync_writes = false). Survives crash; loses ~seconds on power-loss. RocksDB default.

Strong

"strong" — RocksDB with WAL on + WriteOptions::sync = true (per-write fsync). Zero loss; full cost.

Implementations

impl DurabilityTier

pub fn parse(s: &str) -> Option<Self>

Parse a @store(durability:) string. Case-insensitive.

pub const fn backend_type(self) -> BackendType

The BackendType this tier maps to.

pub const fn requires_wal(self) -> bool

Whether this tier requires the WAL to be enabled at backend open time. Memory has nothing to write to; Lossy opts out; Soft + Strong need WAL on.

pub const fn sync_writes(self) -> bool

Whether this tier requests per-write fsync via WriteOptions::sync = true. Only Strong does.

Trait Implementations

impl Clone for DurabilityTier

fn clone(&self) -> DurabilityTier

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for DurabilityTier

impl Debug for DurabilityTier

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

Formats the value using the given formatter.

impl Default for DurabilityTier

fn default() -> Self

Defaults to Soft — RocksDB on-disk, WAL on, no per-write fsync. Matches yeti’s default for user-data tables (BackendType::Disk with WAL enabled).

impl<'de> Deserialize<'de> for DurabilityTier

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for DurabilityTier

impl Hash for DurabilityTier

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 Ord for DurabilityTier

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

This method returns an Ordering between self and other.

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

where Self: Sized,

Compares and returns the maximum of two values.

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

where Self: Sized,

Compares and returns the minimum of two values.

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

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for DurabilityTier

fn eq(&self, other: &DurabilityTier) -> 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 PartialOrd for DurabilityTier

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

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

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

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

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

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

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

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

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

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

impl Serialize for DurabilityTier

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for DurabilityTier