risingwavelabs/risingwave · error · SinkError

ClickHouse error: {0}

Error message

ClickHouse error: {0}

What it means

`SinkError::ClickHouse` is a plain `String` variant of `SinkError`, thrown when the ClickHouse sink encounters an error reported by the ClickHouse server or client driver. Displayed as "ClickHouse error: {0}"; because it stores only a formatted string, the original cause chain is not preserved.

Source

Thrown at src/connector/src/sink/mod.rs:1126

    #[error("Iceberg error: {0}")]
    Iceberg(
        #[source]
        #[backtrace]
        anyhow::Error,
    ),
    #[error("config error: {0}")]
    Config(
        #[source]
        #[backtrace]
        anyhow::Error,
    ),
    #[error("coordinator error: {0}")]
    Coordinator(
        #[source]
        #[backtrace]
        anyhow::Error,
    ),
    #[error("ClickHouse error: {0}")]
    ClickHouse(String),
    #[error("Redis error: {0}")]
    Redis(String),
    #[error("Http error: {0}")]
    Http(
        #[source]
        #[backtrace]
        anyhow::Error,
    ),
    #[error("Mqtt error: {0}")]
    Mqtt(
        #[source]
        #[backtrace]
        anyhow::Error,
    ),
    #[error("Nats error: {0}")]
    Nats(
        #[source]

View on GitHub (pinned to 6469eb736d)

Solutions

1. Read the embedded message — ClickHouse server errors name the failing table/column and error code.
2. Verify connection settings in the sink `WITH` clause: `url`/host, port (native 9000 vs HTTP 8123), user, password, database, table.
3. Confirm the ClickHouse table exists, is insertable (e.g. MergeTree family), and its columns match the sink schema in name and type.
4. Check server-side limits (max_parts_in_total, quotas, auth grants for the user's IP) if the message references limits or access denial.

Example fix

-- before
CREATE SINK s FROM mv WITH (
  connector = 'clickhouse',
  clickhouse.url = 'http://localhost:8123',
  clickhouse.table = 'nonexistent_table'
);
-- after
CREATE SINK s FROM mv WITH (
  connector = 'clickhouse',
  clickhouse.url = 'http://localhost:8123',
  clickhouse.user = 'default',
  clickhouse.password = '...',
  clickhouse.database = 'default',
  clickhouse.table = 'my_table'
);

async fn check_clickhouse_table(opts: &ClickHouseConfig) -> Result<(), String> {
    let client = clickhouse::Client::default().with_url(&opts.url).with_user(&opts.user).with_password(&opts.password);
    let exists: Option<u8> = client
        .query("SELECT 1 FROM system.tables WHERE database = ? AND name = ?")
        .bind(&opts.database).bind(&opts.table)
        .fetch_optional().await.map_err(|e| e.to_string())?;
    anyhow::ensure!(exists.is_some(), "clickhouse table {}.{} not found", opts.database, opts.table);
    Ok(())
}

fn as_clickhouse_error(err: &SinkError) -> Option<&str> {
    if let SinkError::ClickHouse(msg) = err { Some(msg) } else { None }
}

match sink.write(batch).await {
    Err(SinkError::ClickHouse(msg)) => {
        if msg.contains("Code: 252") || msg.contains("too many parts") {
            // transient server-side limit: back off and retry
            tokio::time::sleep(Duration::from_secs(5)).await;
        } else if msg.contains("Authentication") || msg.contains("Unknown table") {
            // deterministic: fix connection options or create the table; do not retry
            log::error!("clickhouse config/table error: {msg}");
            return Err(SinkError::ClickHouse(msg).into());
        }
    }
    Err(e) => return Err(e.into()),
    Ok(_) => {}
}

When it happens

Trigger: Writing to ClickHouse from the sink: establishing the client connection, executing INSERTs against a table, schema/table-name resolution, authentication failures, or the ClickHouse server rejecting a request with an error code that the sink formats into this variant.

Common situations: Wrong host/port, user, or password in `WITH` options; target table or database missing, or engine incompatible with inserts (e.g. non-MergeTree family without allowed settings); column name/type mismatch between RisingWave sink schema and ClickHouse table; server rejects batch due to part limits or quota exceeded.

Related errors

• serde_json deserialization error of ClickHouseConfig from pr
• `{}` must be {}, or {}
• Primary key not defined for upsert clickhouse sink (please d
• license feature check failed (ClickHouseSharedEngine not ava
• `commit_checkpoint_interval` must be greater than 0

AI-assisted analysis of risingwavelabs/risingwave@6469eb736d (2026-09-11). Data as JSON: /api/errors/2171ce753c0297cc. Report an issue: GitHub.