Enum StateBackendError 

pub enum StateBackendError {
    Io(String),
    Serialization(String),
    NotFound {
        vnode: u32,
        epoch: u64,
    },
    StaleVersion {
        caller: u64,
        authoritative: u64,
    },
    FutureVersion {
        caller: u64,
        authoritative: u64,
    },
    Conflict {
        resource: String,
        message: 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when a stale writer (for example, a deposed vnode owner) attempts to persist state at a version that has since been superseded.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.

FutureVersion

The caller claims an assignment generation this backend has not adopted. Accepting it would let an unverified future owner bypass the local assignment fence.

Fields

caller: u64

Version the writer claims is current.

authoritative: u64

Exact authoritative version adopted by this backend.

Conflict

A create-once artifact or seal already exists with different bytes or fencing metadata. Retrying the identical write is accepted; conflicting content is never overwritten.

Fields

resource: String

Object path or in-process key that conflicted.

message: String

Human-readable conflict detail.

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.