错误提示如下：
Exception in thread “main” java.net.BindException: Cannot assign requested address: Service ‘sparkDriver’ failed after 16 retries (starting from 0)! Consider explicitly setting the appropriate port for the service ‘sparkDriver’ (for example spark.ui.port

问题发现：因为之前改了ip，导致ssh集群能用，hosts文件的映射没有改变，还是旧的。

解决方法：将IP改回原来，或者hosts文件更新映射关系即可。