Enum BackendType 

pub enum BackendType {
    Disk,
    InMemory,
}

Storage backend type — binary choice: disk (persistent) vs memory (volatile). Replication is a separate axis handled by @distribute; this enum only says whether the bytes hit disk or stay in RAM.

User-facing values: "memory" or "disk". "disk" is the default and typically omitted in schema; "memory" is the opt-in for volatility-tolerant workloads.

The concrete disk engine (RocksDB today; potentially others later) is an implementation detail the operator doesn’t care about — hence “disk” rather than naming the engine. Legacy values "rocksdb" and "distributed" still parse for backward compatibility; new code should use "disk".

Variants

Disk

On-disk persistent storage. Engine is a platform detail (currently sharded RocksDB; swappable without schema changes). Default; users typically don’t set this explicitly.

InMemory

In-memory HashMap — volatile, fast, no disk. First-class production option for workloads whose data tolerates reset-on-crash: rate-limit buckets, session caches, dedup sets, leaderboards rebuilt from source-of-truth, ephemeral workflow scratch. ~10x lower write latency than disk, no fsync tail.

Replication (cross-node state) is handled by the @distribute directive, which wraps any KvBackend regardless of concrete type — memory-backed tables can still participate in replication when explicitly opted in.

Trait Implementations

impl Clone for BackendType

fn clone(&self) -> BackendType

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for BackendType

impl Debug for BackendType

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

Formats the value using the given formatter.

impl Default for BackendType

fn default() -> BackendType

Returns the “default value” for a type.

impl Display for BackendType

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

Formats the value using the given formatter.

impl Eq for BackendType

impl FromStr for BackendType

type Err = YetiError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl Hash for BackendType

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 BackendType

fn cmp(&self, other: &BackendType) -> 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 BackendType

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

fn partial_cmp(&self, other: &BackendType) -> 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 StructuralPartialEq for BackendType