// accommodate concurrent PutObjectPart requests

	partSuffix := fmt.Sprintf("part.%d", partID)
	// Random UUID and timestamp for temporary part file.
	tmpPart := fmt.Sprintf("%sx%d", mustGetUUID(), time.Now().UnixNano())
	tmpPartPath := pathJoin(tmpPart, partSuffix)

	// Delete the temporary object part. If PutObjectPart succeeds there would be nothing to delete.
	defer func() {