Enum PersistenceStrategy 

pub enum PersistenceStrategy {
    DiskFirst,
    MemFirst,
}

Defines how Raft log entries are persisted and accessed.

All strategies use a configurable FlushPolicy to control when memory contents are flushed to disk, affecting write latency and durability guarantees.

Note: Both strategies now fully load all log entries from disk into memory at startup. The in-memory SkipMap serves as the primary data structure for reads in all modes.

Variants

DiskFirst

Disk-first persistence strategy.

• Write path: On append, the log entry is first written to disk. Only after a successful disk write is it acknowledged and stored in the in-memory SkipMap.

• Read path: Reads are always served from the in-memory SkipMap.

• Startup behavior: All log entries are loaded from disk into memory at startup, ensuring consistent access speed regardless of disk state.

• Suitable for systems prioritizing strong durability while still providing in-memory performance for reads.

MemFirst

Memory-first persistence strategy.

• Write path: On append, the log entry is first written to the in-memory SkipMap and acknowledged immediately. Disk persistence happens asynchronously in the background, governed by FlushPolicy.

• Read path: Reads are always served from the in-memory SkipMap.

• Startup behavior: All log entries are loaded from disk into memory at startup, the same as DiskFirst.

• Suitable for systems that favor lower write latency and faster failover, while still retaining a disk-backed log for crash recovery.

Trait Implementations

impl Clone for PersistenceStrategy

fn clone(&self) -> PersistenceStrategy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PersistenceStrategy

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for PersistenceStrategy

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for PersistenceStrategy

fn eq(&self, other: &PersistenceStrategy) -> 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 Serialize for PersistenceStrategy

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 PersistenceStrategy