Enum RollbackDecision 

pub enum RollbackDecision {
    RollbackToMatchpoint {
        matchpoint_vlsn: Vlsn,
        start_vlsn: Vlsn,
    },
    HardRecovery {
        matchpoint_vlsn: Vlsn,
        last_txn_end: Vlsn,
    },
    NetworkRestore,
}

The action verifyRollback selects once a matchpoint search has completed.

Port of the ReplicaFeederSyncup.verifyRollback truth table.

Variants

RollbackToMatchpoint

Roll the diverged tail back to the matchpoint, then resume streaming from matchpoint + 1. A “normal” rollback that does not cross a committed/aborted transaction end (lastTxnEnd <= matchpoint).

Fields

matchpoint_vlsn: Vlsn

start_vlsn: Vlsn

HardRecovery

The matchpoint would require rolling back past a transaction end that the replica has acknowledged. JE does a hard recovery (log truncation

• restart) when truncation is permissible.

Fields

matchpoint_vlsn: Vlsn

last_txn_end: Vlsn

NetworkRestore

No safe matchpoint / truncation not permissible — the replica must do a full network restore from the master.

Trait Implementations

impl Clone for RollbackDecision

fn clone(&self) -> RollbackDecision

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RollbackDecision

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

Formats the value using the given formatter.

impl Eq for RollbackDecision

impl PartialEq for RollbackDecision

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