优化建议

1、SSH设置不灵活，多台服务器的用户名和密码有可能不一样。
2、第一次dump的等待时间逻辑，为什么不使用join()。
3、定期任务可以使用Quartz来完成，不要简陋的timer以及自己写while的形式循环往线程池加任务线程。

Start by locating the SSH configuration, first-dump wait handling, and periodic task scheduling mentioned in the issue. Review how these areas currently handle multiple servers, the initial dump, and recurring work. Done should mean the three requested behaviors are addressed and verified without regressions.

Written by the indexing model from the issue text.