JuliusBrussee/caveman · error

cachebench: read observations: %w

Error message

cachebench: read observations: %w

What it means

Error "cachebench: read observations: %w" thrown in JuliusBrussee/caveman.

Source

Thrown at cacheengine/cachebench/observed.go:139

		if err := decoder.Decode(&record); err != nil {
			return nil, fmt.Errorf("cachebench: observation line %d: %w", line, err)
		}
		var trailing any
		if err := decoder.Decode(&trailing); err != io.EOF {
			return nil, fmt.Errorf("cachebench: observation line %d: trailing JSON", line)
		}
		if record.Schema != ObservationSchema {
			return nil, fmt.Errorf("cachebench: observation line %d: schema %q", line, record.Schema)
		}
		if strings.TrimSpace(record.RequestID) == "" || seen[record.RequestID] {
			return nil, fmt.Errorf("cachebench: observation line %d: empty or duplicate request_id", line)
		}
		seen[record.RequestID] = true
		record.Usage = append(json.RawMessage(nil), record.Usage...)
		records = append(records, record)
	}
	if err := scanner.Err(); err != nil {
		return nil, fmt.Errorf("cachebench: read observations: %w", err)
	}
	if len(records) == 0 {
		return nil, errors.New("cachebench: no observation records")
	}
	if err := validateObservationRecords(records); err != nil {
		return nil, err
	}
	return records, nil
}

// EvaluateObserved evaluates supplied observations without completeness claim.
func EvaluateObserved(records []ObservationRecord, target Target) (Report, error) {
	if err := validateTarget(target); err != nil {
		return Report{}, err
	}
	if len(records) == 0 {
		return Report{}, errors.New("cachebench: no observation records")
	}

View on GitHub (pinned to 27d5a3981a)

Solutions

1. Fix the observations read error (path/permissions) and retry.

When it happens

Trigger: Thrown at cacheengine/cachebench/observed.go:139 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of JuliusBrussee/caveman@27d5a3981a (2026-08-15). Data as JSON: /api/errors/c4a28dd0cdd29908. Report an issue: GitHub.