risingwavelabs/risingwave · error · MetaError

Session parameters error: {0}

Error message

Session parameters error: {0}

What it means

Reading or writing a session-scoped configuration variable failed, wrapping a SessionConfigError via `#[from]`. Session params are per-connection settings (e.g. timezone, RW_IMPLICIT_FLUSH); this error means an attempt to get/set one failed.

Source

Thrown at src/meta/src/error.rs:103

        &'static str,
        String,
        // if under creation, take streaming job id, otherwise None
        Option<JobId>,
    ),

    #[error("Service unavailable: {0}")]
    Unavailable(#[message] String),

    #[error("Election failed: {0}")]
    Election(#[source] BoxedError),

    #[error("Cancelled: {0}")]
    Cancelled(String),

    #[error("System parameters error: {0}")]
    SystemParams(String),

    #[error("Session parameters error: {0}")]
    SessionConfig(
        #[from]
        #[backtrace]
        SessionConfigError,
    ),

    #[error(transparent)]
    Connector(
        #[from]
        #[backtrace]
        ConnectorError,
    ),

    #[error("Sink error: {0}")]
    Sink(
        #[from]
        #[backtrace]
        SinkError,

View on GitHub (pinned to 6469eb736d)

Solutions

1. Check the variable name spelling and that it exists in this RisingWave version (`SHOW VARIABLES`-style introspection).
2. Provide a value of the correct type/format for the variable.
3. If the variable was renamed in an upgrade, update scripts to the new name.
4. Use `RESET <variable>` to restore defaults if a bad value was set.

Example fix

// before
SET bariier_interval_ms = 1000; -- SessionConfig error (typo)
// after
SET barrier_interval_ms = 1000;

fn valid_session_param(name: &str, value: &str) -> bool {
    matches!(name, "barrier_interval_ms" | "timezone" | "query_mode" /* ... */) && !value.is_empty()
}

match meta_result {
    Err(MetaError::SessionConfig(e)) => { /* unknown or invalid session variable; introspect valid variables */ }
    other => other?,
}

When it happens

Trigger: `SET <session_param> = <value>` with an unknown or invalid value, `SHOW <param>` for a nonexistent session variable, param value failing to parse into its target type.

Common situations: Typo'd SET variable names, setting a read-only or reserved variable, wrong value type (e.g. string where integer expected), variable removed/renamed after a RisingWave version change.

Understand the failure class

Background: "Invalid value" and "allowed values are" config errors: what your library rejected and how to fix it — this error's family across 41 libraries.

Related errors

• env variable `RW_META_ADDR` not found. For `./risedev d` us
• to use iceberg engine table, the variable `iceberg_engine_co
• Failed to parse source definition SQL
• SinkError::Config(anyhow!(e))
• System parameters error: {0}

AI-assisted analysis of risingwavelabs/risingwave@6469eb736d (2026-09-11). Data as JSON: /api/errors/71e03568f1d68b1b. Report an issue: GitHub.