risingwavelabs/risingwave · error · SchemaFetchError::SchemaCompile

schema compilation error: {0}

Error message

schema compilation error: {0}

What it means

SchemaFetchError::SchemaCompile carries a boxed error indicating the fetched schema (Protobuf/Avro/JSON) failed to compile or parse into a RisingWave schema — e.g. invalid .proto syntax, Avro schema that can't be processed, or unsupported schema constructs.

Source

Thrown at src/connector/src/schema/mod.rs:59

pub struct MalformedResponseError {
    pub message: String,
}

#[derive(Debug, thiserror::Error)]
pub enum SchemaFetchError {
    #[error(transparent)]
    InvalidOption(#[from] InvalidOptionError),
    #[error(transparent)]
    License(#[from] risingwave_common::license::FeatureNotAvailable),
    #[error(transparent)]
    Request(#[from] schema_registry::ConcurrentRequestError),
    #[error(transparent)]
    AwsGlue(#[from] Box<aws_sdk_glue::operation::get_schema_version::GetSchemaVersionError>),
    #[error(transparent)]
    MalformedResponse(#[from] MalformedResponseError),
    #[error("schema version id invalid: {0}")]
    InvalidUuid(#[from] uuid::Error),
    #[error("schema compilation error: {0}")]
    SchemaCompile(
        #[source]
        #[backtrace]
        risingwave_common::error::BoxedError,
    ),
    #[error("{0}")] // source+{0} is effectively transparent but allows backtrace
    YetToMigrate(
        #[source]
        #[backtrace]
        ConnectorError,
    ),
    #[error("schema registry client error: {0}")]
    Client(#[from] schema_registry::SchemaRegistryClientError),
}

View on GitHub (pinned to 6469eb736d)

Solutions

1. Validate the schema locally (protoc --descriptor_set_out for proto, avro tools for avro) before registering.
2. Fix syntax errors: add missing imports, 'syntax = "proto3";', correct types.
3. Simplify/remove schema features unsupported by RisingWave's compiler.

Example fix

// before (schema.proto)
message Event { required string id = 1; } // proto2 without syntax line
// after
syntax = "proto3";
message Event { string id = 1; }

// compile-check schemas before registering
// protobuf:
//   protoc --descriptor_set_out=/dev/null schema.proto
// avro:
//   avro-tools compile-schema schema.avsc

match fetch_and_compile_schema() {
    Err(e) if e.to_string().starts_with("schema compilation error") => {
        // fix .proto/.avsc per the inner error text, then retry
    }
    Err(e) => return Err(e.into()),
    Ok(s) => s,
}

When it happens

Trigger: A schema fetched from file/HTTP/S3/registry is syntactically invalid or uses features RisingWave's schema compiler doesn't accept, during source/materialized-view schema resolution.

Common situations: Malformed .proto files (missing syntax declaration, unresolved imports); Avro schemas with unsupported logical types; registry serving a schema incompatible with the embedded parser version.

Understand the failure class

Background: Schema validation failed / invalid input schema: payload rejected because its shape doesn't match the expected schema — this error's family across 28 libraries.

Related errors

• schema invalid, record type required at top level of the sch
• circular reference detected in Avro schema: {} -> {}
• failed to convert JSON schema to Avro schema: {}
• {0}
• Root schema of debezium shall be a record but got: {root:?}

AI-assisted analysis of risingwavelabs/risingwave@6469eb736d (2026-09-11). Data as JSON: /api/errors/9d21326b3cb9b61c. Report an issue: GitHub.