risingwavelabs/risingwave · error · ErrorCode
Scheduler error
Error message
Scheduler error: {0} What it means
RisingWave frontend's ErrorCode::SchedulerError variant, rendered as "Scheduler error: {0}". It wraps a BoxedError raised while scheduling a distributed query or batch task: assigning fragments/workers, scheduling on the compute nodes, or dispatching batch execution. The inner error describes the scheduling failure.
Solutions
- Check cluster health (SHOW NODES / cluster status) and restart any unhealthy compute nodes.
- Inspect frontend/compute logs around the failure for the wrapped inner error message.
- Verify network connectivity from the frontend node to each compute node's RPC port.
- Retry the query once the cluster is healthy; if persistent, check resource limits (memory) on compute nodes.
Defensive patterns
Strategy: retry
Validate before calling
// before submitting
const nodes = await showNodes(); if (nodes.filter(n => n.healthy).length === 0) throw new Error('no healthy compute nodes'); Try / catch
try { await runQuery(sql) } catch (e) {
if (/Scheduler error/.test(e.message)) { await backoff(); retry(); }
else throw e;
} Prevention
- Monitor compute node health and alert before scheduling pressure builds.
- Verify frontend-to-compute RPC connectivity after every network change.
- Right-size compute memory to avoid OOM kills during dispatch.
When it happens
Trigger: Query scheduler fails to place a batch query on compute nodes; a compute node is unavailable or rejects task creation during query dispatch; frontend scheduler code converts an inner scheduling failure (e.g. tonic status) into ErrorCode::SchedulerError.
Common situations: Compute nodes down or OOM-killed while the frontend is up; network partition between frontend and compute nodes; cluster scaled down while queries keep arriving; resource limits preventing task creation.
Understand the failure class
Background: Database query failed: Internal Server Error 500s wrapping SQL, Prisma, and connection failures — what to check first — this error's family across 16 libraries.
Related errors
AI-assisted analysis of risingwavelabs/risingwave@6469eb736d (2026-09-11).
Data as JSON: /api/errors/a34c0dfcc384bb88.
Report an issue: GitHub.
Appendix: source
Thrown at src/frontend/src/error.rs:143
#[backtrace]
error: BoxedError,
},
#[error(transparent)]
CastError(
#[from]
#[backtrace]
CastError,
),
#[error("Catalog error: {0}")]
CatalogError(
#[source]
#[backtrace]
#[message]
BoxedError,
),
#[error("Protocol error: {0}")]
ProtocolError(#[message] String),
#[error("Scheduler error: {0}")]
SchedulerError(
#[source]
#[backtrace]
BoxedError,
),
#[error("Task not found")]
TaskNotFound,
#[error("Session not found")]
SessionNotFound,
#[error("Invalid reference: {0}")]
InvalidReference(String),
#[error("Item not found: {0}")]
ItemNotFound(String),
#[error("Duplicate Relation Name: {0}")]
DuplicateRelationName(String),
#[error("Invalid insert operation: {0}")]
InsertViolation(String),
#[error("Invalid input syntax: {0}")]View on GitHub (pinned to 6469eb736d)