{"record":{"id":"a34c0dfcc384bb88","repo":"risingwavelabs/risingwave","slug":"scheduler-error-0","errorCode":null,"errorMessage":"Scheduler error: {0}","messagePattern":"Scheduler error: (.+?)","errorType":"error_code","errorClass":"ErrorCode","httpStatus":null,"severity":"error","filePath":"src/frontend/src/error.rs","lineNumber":143,"sourceCode":"        #[backtrace]\n        error: BoxedError,\n    },\n    #[error(transparent)]\n    CastError(\n        #[from]\n        #[backtrace]\n        CastError,\n    ),\n    #[error(\"Catalog error: {0}\")]\n    CatalogError(\n        #[source]\n        #[backtrace]\n        #[message]\n        BoxedError,\n    ),\n    #[error(\"Protocol error: {0}\")]\n    ProtocolError(#[message] String),\n    #[error(\"Scheduler error: {0}\")]\n    SchedulerError(\n        #[source]\n        #[backtrace]\n        BoxedError,\n    ),\n    #[error(\"Task not found\")]\n    TaskNotFound,\n    #[error(\"Session not found\")]\n    SessionNotFound,\n    #[error(\"Invalid reference: {0}\")]\n    InvalidReference(String),\n    #[error(\"Item not found: {0}\")]\n    ItemNotFound(String),\n    #[error(\"Duplicate Relation Name: {0}\")]\n    DuplicateRelationName(String),\n    #[error(\"Invalid insert operation: {0}\")]\n    InsertViolation(String),\n    #[error(\"Invalid input syntax: {0}\")]","sourceCodeStart":125,"sourceCodeEnd":161,"githubUrl":"https://github.com/risingwavelabs/risingwave/blob/6469eb736d691e8e9b8a419a57edd6429ca77417/src/frontend/src/error.rs#L125-L161","documentation":"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.","triggerScenarios":"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.","commonSituations":"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.","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."],"exampleFix":null,"handlingStrategy":"retry","validationCode":"// before submitting\nconst nodes = await showNodes(); if (nodes.filter(n => n.healthy).length === 0) throw new Error('no healthy compute nodes');","typeGuard":null,"tryCatchPattern":"try { await runQuery(sql) } catch (e) {\n  if (/Scheduler error/.test(e.message)) { await backoff(); retry(); }\n  else throw e;\n}","preventionTips":["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."],"tags":["scheduler","distributed","risingwave","cluster"],"backgroundTag":"database-query-failed","analyzedSha":"6469eb736d691e8e9b8a419a57edd6429ca77417","analyzedAt":"2026-09-11T21:06:21.487Z","contentChangedAt":"2026-09-11T21:06:21.487Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}