juicedata/juicefs · error

error reading response: %v

Error message

error reading response: %v

What it means

Returned by getRequest in `juicefs debug` when the HTTP response body from the pprof/metrics endpoint could not be read after a successful request. It wraps the underlying I/O error (connection reset, premature close) from talking to the mount process's debug interface.

Source

Thrown at cmd/debug.go:244

	if err != nil {
		return nil, fmt.Errorf("error creating GET request: %v", err)
	}
	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		return nil, fmt.Errorf("error GET request: %v", err)
	}
	if resp.StatusCode != 200 {
		return nil, fmt.Errorf("error GET request, status code %d", resp.StatusCode)
	}

	defer func(body io.ReadCloser) {
		if err := body.Close(); err != nil {
			logger.Errorf("error closing body: %v", err)
		}
	}(resp.Body)
	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("error reading response: %v", err)
	}

	return body, nil
}

// check pprof service status
func checkPort(port int, amp string) error {
	url := fmt.Sprintf("http://localhost:%d/debug/pprof/cmdline?debug=1", port)
	resp, err := getRequest(url, 3*time.Second)
	if err != nil {
		return fmt.Errorf("error checking pprof alive: %v", err)
	}
	resp = bytes.ReplaceAll(resp, []byte{0}, []byte{' '})
	fields := strings.Fields(string(resp))
	flag := false
	for _, field := range fields {
		if amp == field {
			flag = true

View on GitHub (pinned to c9a67b23e8)

Solutions

1. Confirm the mount process is alive and the debug/https-port is reachable
2. Retry `juicefs debug`; transient connection resets while the process is under load are common

When it happens

Trigger: Thrown at cmd/debug.go:244 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of juicedata/juicefs@c9a67b23e8 (2026-09-06). Data as JSON: /api/errors/0b0c14971341c71f. Report an issue: GitHub.