https://docs.aws.amazon.com/zh_cn/emr/latest/ManagementGuide/emr-what-is-emr.html
https://docs.aws.amazon.com/zh_cn/emr/latest/ReleaseGuide/emr-release-3x.html
https://blog.csdn.net/Agony__X/article/details/78707927
https://docs.aws.amazon.com/zh_cn/emr/latest/ManagementGuide/emr-what-is-emr.html
https://docs.aws.amazon.com/zh_cn/emr/latest/ReleaseGuide/emr-release-3x.html
https://blog.csdn.net/Agony__X/article/details/78707927