Enum GraphError 

#[non_exhaustive]
pub enum GraphError {
    LabelOverflow {
        used: usize,
    },
    NodeOverflow {
        used: usize,
    },
    MemoryBudget(MemError),
    WithdrawRefused {
        kind: &'static str,
        name: String,
    },
    RebuildInProgress,
    RebuildSuperseded,
    RebuildJournalOverflow {
        cap_bytes: usize,
    },
    RebuildReplayDiverged {
        op: &'static str,
    },
    RebuildSnapshotInvalid {
        detail: String,
    },
}

Errors returned by graph-engine operations.

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.

LabelOverflow

The CSR’s edge-label id space is exhausted. Happens only when more than MAX_EDGE_LABELS distinct labels have been interned — in practice unreachable because the DSL ingress caps label length and realistic workloads use orders of magnitude fewer labels. Surfaced here so the failure mode is a typed error, not a silent wrap (the bug this crate was shipping before).

Fields

used: usize

NodeOverflow

The CSR’s node id space is exhausted. A single CsrIndex partition supports at most MAX_NODES_PER_CSR (≈ 4 billion) distinct nodes. Inserts beyond this limit are rejected rather than silently wrapping the u32 node index. Collections approaching this limit should be sharded across multiple partitions.

Fields

used: usize

MemoryBudget(MemError)

The memory governor rejected a reservation for a graph operation.

Callers should apply backpressure and retry after memory is released.

WithdrawRefused

A rollback asked to withdraw an interned node or node label that is not the newest one, or that something still refers to. Withdrawing it would renumber or orphan live state.

Fields

kind: &'static str

name: String

RebuildInProgress

A rebuild of this index is already running. The partition holds one write journal at a time.

RebuildSuperseded

The index a rebuild started from is no longer the live one: it was dropped, replaced, or its rebuild was aborted. The rebuilt copy is discarded and the live index stays as it is.

RebuildJournalOverflow

The writes made during a rebuild exceeded the journal bound. The rebuilt copy is discarded, the live index keeps every write, and a new rebuild can run.

Fields

cap_bytes: usize

RebuildReplayDiverged

A journaled write returned a different outcome on the rebuilt index than on the live one. The rebuilt copy is discarded.

Fields

op: &'static str

RebuildSnapshotInvalid

The snapshot a rebuild carries does not decode into an index.

Fields

detail: String

Trait Implementations

impl Debug for GraphError

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

Formats the value using the given formatter.

impl Display for GraphError

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

Formats the value using the given formatter.

impl Error for GraphError

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 From<MemError> for GraphError

fn from(source: MemError) -> Self

Converts to this type from the input type.