Enum MigrationError 

#[non_exhaustive]
pub enum MigrationError {
    UnknownPartition,
    AlreadyMigrating,
    NotMigrating,
    NotDraining,
    NotCutover,
    Backend {
        reason: &'static str,
    },
}

Why a migration state transition was refused: the transition does not apply to the partition’s current state. Transitions are total and side-effect-free on failure, so a refused transition leaves the table unchanged.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

UnknownPartition

The partition has no placement to transition.

AlreadyMigrating

begin_migration requires a settled (Active) partition.

NotMigrating

enter_cutover/complete/abort require an in-flight migration.

NotDraining

enter_cutover requires the Draining phase.

NotCutover

complete_migration requires the Cutover phase.

Backend

The distributed MigrationStore backend was unreachable or rejected the operation (network/store failure, not a logical phase error). Retryable by the controller; never inferred for the in-process table, which has no backend to fail. The value-free reason is for the operator/LLM.

Fields

reason: &'static str

A short, value-free description of the backend failure.

Trait Implementations

impl Clone for MigrationError

fn clone(&self) -> MigrationError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MigrationError

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

Formats the value using the given formatter.

impl Display for MigrationError

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

Formats the value using the given formatter.

impl Eq for MigrationError

impl Error for MigrationError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl PartialEq for MigrationError

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