juicedata/juicefs · error

error getting metric: %v

Error message

error getting metric: %v

What it means

Returned by reqAndSaveMetric during `juicefs debug` when fetching a metric URL (heap, goroutine, etc.) from the pprof endpoint fails. It wraps the request-level error from the mount process's debug HTTP server.

Source

Thrown at cmd/debug.go:278

	for _, field := range fields {
		if amp == field {
			flag = true
		}
	}
	if !flag {
		return fmt.Errorf("mount point mismatch: \n%s\n%s", resp, amp)
	}
	return nil
}

type metricItem struct {
	name, url string
}

func reqAndSaveMetric(name string, metric metricItem, outDir string, timeout time.Duration) error {
	resp, err := getRequest(metric.url, timeout)
	if err != nil {
		return fmt.Errorf("error getting metric: %v", err)
	}
	retPath := filepath.Join(outDir, fmt.Sprintf("juicefs.%s", metric.name))
	retFile, err := os.Create(retPath)
	if err != nil {
		logger.Fatalf("error creating metric file %s: %v", retPath, err)
	}
	defer closeFile(retFile)

	if name == "cmdline" {
		resp = bytes.ReplaceAll(resp, []byte{0}, []byte{' '})
	}

	writer := bufio.NewWriter(retFile)
	if _, err := writer.Write(resp); err != nil {
		return fmt.Errorf("failed to write metric %s: %v", name, err)
	}
	return writer.Flush()
}

View on GitHub (pinned to c9a67b23e8)

Solutions

1. Ensure the target mount process is still running while metrics are collected
2. Re-run `juicefs debug` after verifying pprof port connectivity

When it happens

Trigger: Thrown at cmd/debug.go:278 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/bf8224c37e6feb03. Report an issue: GitHub.