Enum Durability 

pub enum Durability {
    Record,
    Os,
}

When the log asks the filesystem to make a publication durable.

Both settings stage a complete JSONL image, call sync_data on that image, and publish it with one atomic rename, so no reader — in this process or another — can ever observe a half-written record or a stale-generation append. Record additionally syncs the containing directory after the rename where the platform exposes that operation. Neither setting can promise power-loss behavior for an arbitrary filesystem or NFS mount.

Variants

Record

Sync the staged image after every record and request a containing- directory sync after every publication.

The default. Each mutation still stages the complete current image, so its I/O grows with the image size; see the journal durability documentation and size metrics. The directory sync is a best-effort publication-durability request: arbitrary filesystems and NFS mounts may not provide a power-loss guarantee.

Os

Leave publication metadata durability to the operating system.

The generation-bound copy-on-write protocol still syncs every staged image before its atomic rename: without that, a machine crash could expose a torn prefix rather than lose only a tail. It does not request a containing-directory sync after the journal rename, so the name’s power-loss durability remains filesystem policy. Snapshots retain their own atomic, synced cache publication.

Trait Implementations

impl Clone for Durability

fn clone(&self) -> Durability

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Durability

impl Debug for Durability

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

Formats the value using the given formatter.

impl Default for Durability

fn default() -> Durability

Returns the “default value” for a type.

impl Eq for Durability

impl PartialEq for Durability

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Durability