saveAsTextFile 能够接收本地文件系统路径(例如 file:///tmp/magic/...).但是，如果您在分布式集群上运行，您很可能希望 collect() 将数据返回到集群，然后使用标准文件操作将其保存.

saveAsTextFile is able to take in local file system paths (e.g. file:///tmp/magic/...). However, if your running on a distributed cluster, you most likely want to collect() the data back to the cluster and then save it with standard file operations.