Enum SyncMode 

pub enum SyncMode {
    PerCommit,
    Group {
        interval_ms: u32,
    },
    None,
}

Durability mode for committed transactions.

The engine has at most one concurrent committer at a time, so the classical group-commit win — overlapping fsyncs across many committers — does not apply here. SyncMode::PerCommit is the default. The other two modes exist for narrow operational profiles.

Variants

PerCommit

fsync the active segment before the committing thread releases the store write lock. The strongest durability guarantee the WAL offers; every observed query result is fully durable.

Group

Write commit bytes to the OS immediately, then fsync on a fixed cadence on a background thread. This survives ordinary process death after flush() returns, but can still trade the last interval_ms of commits on power loss or kernel crash for higher throughput on bulk-load workloads.

A background fsync failure poisons the WAL: the next commit / flush / force_fsync returns crate::WalError::Poisoned and Wal::bg_failure reports the underlying cause. Operators inspect that via /admin/wal/status (bgFailure) and recover by restarting from the last consistent snapshot + WAL.

Fields

interval_ms: u32

None

Append but never fsync from the WAL; rely on whatever the OS happens to flush. Intended for CDC-only deployments where the WAL is consumed by an external reader and durability is provided elsewhere.

Trait Implementations

impl Clone for SyncMode

fn clone(&self) -> SyncMode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SyncMode

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

Formats the value using the given formatter.

impl Default for SyncMode

fn default() -> SyncMode

Returns the “default value” for a type.

impl PartialEq for SyncMode

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

impl Eq for SyncMode

impl StructuralPartialEq for SyncMode