risingwavelabs/risingwave · error

Internal

Internal

Error message

failed to get request

What it means

The streaming control gRPC stream between the compute node's barrier worker and the meta node failed while reading the next request. The worker wraps the underlying tonic status error as Code::Internal with this message and resets the control stream so a fresh connection can be re-established. It indicates transport-level failure of the control stream, not a barrier-processing bug.

Source

Thrown at src/stream/src/task/barrier_worker/mod.rs:219

                }))
                .is_err()
            {
                self.pair = None;
                warn!("failed to send the response; the control stream was reset");
            }
        } else {
            debug!(?response, "control stream has been reset. ignore response");
        }
    }

    async fn next_request(&mut self) -> StreamingControlStreamRequest {
        if let Some((_, stream)) = &mut self.pair {
            match stream.next().await {
                Some(Ok(request)) => {
                    return request;
                }
                Some(Err(e)) => self.reset_stream_with_err(
                    anyhow!(TonicStatusWrapper::new(e)) // wrap the status to provide better error report
                        .context("failed to get request")
                        .to_status_unnamed(Code::Internal),
                ),
                None => self.reset_stream_with_err(Status::internal("end of stream")),
            }
        }
        pending().await
    }
}

pub(super) enum TakeReceiverRequest {
    Remote {
        result_sender: oneshot::Sender<StreamResult<Receiver>>,
        upstream_fragment_id: FragmentId,
    },
    Local(permit::Sender),
}

View on GitHub (pinned to 6469eb736d)

Solutions

1. Check connectivity between the compute node and meta node (address/port, firewall, network policies).
2. Inspect meta node logs at the matching time for shutdown or errors that terminated the stream.
3. Verify tonic/gRPC timeout and keepalive configuration on the control stream channel.
4. Rely on the built-in stream reset: the worker reconnects automatically; if errors recur, investigate the underlying status wrapped in TonicStatusWrapper for the root cause.

Example fix

// before: opaque status propagated
let status = Status::internal(e.to_string());
// after: wrap tonic status with context for better reports
let status = anyhow!(TonicStatusWrapper::new(e))
    .context("failed to get request")
    .to_status_unnamed(Code::Internal);

// check control stream connectivity before heavy work
let ok = tokio::net::TcpStream::connect(&meta_addr).await.is_ok();

// reconnect loop around control stream consumption
loop {
    match worker.next_request().await {
        Ok(req) => handle(req),
        Err(e) if e.to_string().contains("failed to get request") => { backoff().await; reconnect().await; }
        Err(e) => return Err(e),
    }
}

When it happens

Trigger: next_request() receives Some(Err(e)) from the tonic streaming control stream; the None (stream closed) case produces 'end of stream' instead.

Common situations: Network partition or dropped connection between compute node and meta node; meta node restarting or being killed; gRPC keepalive timeout; proxy/LB closing idle streams.

Understand the failure class

Background: 'Something went wrong' / 'Request failed (500)' / 'HTTP error! status: 404' — what failed HTTP requests actually mean and how to find the real cause — this error's family across 28 libraries.

Related errors

• failed to send request to {} {:?}
• Exchange executor should not have children!
• bigquery insert error: end of resp stream
• Cannot open client to compute node {addr:?}
• RpcError

AI-assisted analysis of risingwavelabs/risingwave@6469eb736d (2026-09-11). Data as JSON: /api/errors/e8cb241bd64ab5e0. Report an issue: GitHub.