怎么查看mysql集群数据节点所存储的文件

boolean tag = true;
final String pattern1 = "^([a-z0-9A-Z]+[-|//.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?//.)+[a-zA-Z]{2,}$";
final Pattern pattern = Pattern.compile(pattern1);
final Matcher mat = pattern.matcher(email);
if (!mat.find()) {