Enum StateBackendError 

pub enum StateBackendError {
    Io(String),
    Serialization(String),
    NotFound {
        vnode: u32,
        epoch: u64,
    },
    StaleVersion {
        caller: u64,
        authoritative: u64,
    },
    SplitBrainCommit {
        committer: String,
        self_id: String,
    },
}

Errors a StateBackend can raise.

Variants

Io(String)

Underlying I/O failure (filesystem, object_store, network).

Serialization(String)

Serialization or framing error in the stored partial bytes.

NotFound

The partial for (vnode, epoch) is not present.

Fields

vnode: u32

Virtual node ID.

epoch: u64

Epoch number.

StaleVersion

The caller’s assignment version is older than the backend’s authoritative version. Thrown by StateBackend::write_partial when a stale writer (e.g. the losing side of a split-brain) attempts to persist state at a version that has since been superseded. The caller should abandon the write, refresh its assignment snapshot, and retry at the new version.

Fields

caller: u64

Version the writer believes is current.

authoritative: u64

Authoritative version seen by the backend.

SplitBrainCommit

Raised by StateBackend::epoch_complete when the caller observes an existing commit marker whose audit body names a different instance. Two leaders raced on the same epoch and the other one won. The caller (losing leader) must NOT proceed with its own sink-commit phase — its view of the state is not the one durably sealed.

Fields

committer: String

Instance id recorded in the existing commit marker.

self_id: String

This backend’s own instance id.

Trait Implementations

impl Debug for StateBackendError

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

Formats the value using the given formatter.

impl Display for StateBackendError

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

Formats the value using the given formatter.

impl Error for StateBackendError

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.