Enum SnapshotMarker 

pub enum SnapshotMarker {
    Begin,
    End(u64),
    Ping {
        generation: u64,
        next_offset: u64,
    },
}

Decoded snapshot marker, returned by decode_snapshot_marker.

Variants

Begin

+SNAPSHOT\r\n — primary is about to stream snapshot chunks.

End(u64)

+SNAPSHOT_END <ack_offset>\r\n — end of snapshot; the next live frame’s offset will equal ack_offset.

Ping

+PING <generation> <next_offset>\r\n — v3.14 in-stream heartbeat: the primary’s current feed generation + next_offset, sent every ~1s so a replica can compute its own lag (applied vs primary) and judge link liveness without a request/response round trip. Out-of-band: occupies no offset space.

v3.16 D2 added the generation (REPL.TOKEN / REPL.WAIT compare token generations against the replica’s last-seen upstream generation). A legacy one-number +PING <next_offset>\r\n line still decodes — generation reads as 0, the “unknown” value no real feed ever serves (feed generations start at 1).

Fields

generation: u64

Primary’s feed generation at send time.

next_offset: u64

Primary’s next_offset when the heartbeat was emitted.

Trait Implementations

impl Debug for SnapshotMarker

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

Formats the value using the given formatter.

impl Eq for SnapshotMarker

impl PartialEq for SnapshotMarker

fn eq(&self, other: &SnapshotMarker) -> 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 StructuralPartialEq for SnapshotMarker