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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 原文：https://www.cnblogs.com/575dsj/p/9235744.html