Enum DagError 

pub enum DagError {
    CycleDetected(String),
    DisconnectedNode(String),
    NodeNotFound(String),
    DuplicateNode(String),
    SchemaMismatch {
        source_node: String,
        target_node: String,
        reason: String,
    },
    FanOutLimitExceeded {
        node: String,
        count: usize,
        max: usize,
    },
    EmptyDag,
    BackpressureFull,
    CheckpointInProgress(u64),
    NoCheckpointInProgress,
    CheckpointIncomplete {
        pending: usize,
    },
    CheckpointNotFound,
    RestoreFailed {
        node_id: String,
        reason: String,
    },
    BaseTableSchemaNotFound(String),
}

Errors that can occur during DAG construction and validation.

Variants

CycleDetected(String)

The DAG contains a cycle involving the named node.

DisconnectedNode(String)

A node has no inputs and no outputs (and is not a source or sink).

NodeNotFound(String)

An edge references a node that does not exist.

DuplicateNode(String)

A node with the same name already exists.

SchemaMismatch

Connected edges have incompatible schemas.

Fields

source_node: String

Source node name.

target_node: String

Target node name.

reason: String

Description of the incompatibility.

FanOutLimitExceeded

A node exceeds the maximum fan-out limit.

Fields

node: String

Node name.

count: usize

Actual fan-out count.

max: usize

Maximum allowed fan-out.

EmptyDag

The DAG is empty (no nodes).

BackpressureFull

A shared stage multicast buffer is full (backpressure).

CheckpointInProgress(u64)

A checkpoint barrier was triggered while another checkpoint is in progress.

NoCheckpointInProgress

Attempted to finalize a checkpoint when none is in progress.

CheckpointIncomplete

Attempted to finalize a checkpoint before all nodes have reported.

Fields

pending: usize

Number of nodes that have not yet reported.

CheckpointNotFound

No checkpoint snapshots are available for recovery.

RestoreFailed

An operator failed to restore from a checkpoint snapshot.

Fields

node_id: String

The node that failed to restore.

reason: String

Description of the failure.

BaseTableSchemaNotFound(String)

A base table schema was not provided for DAG construction from MvRegistry.

Trait Implementations

impl Debug for DagError

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

Formats the value using the given formatter.

impl Display for DagError

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

Formats the value using the given formatter.

impl Error for DagError

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<DagError> for Error

fn from(source: DagError) -> Self

Converts to this type from the input type.