This feature lets you easily move between versions as needed; for example, to roll back should a deployment go badly.

这个特性允许您根据需要在版本间轻松移动；例如，在一个部署出现问题时回滚到上一版本。

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One usage of the snapshot feature may be to roll back a corrupted HDFS instance to a previously known good point in time.

一个使用可能快照功能的情况是一个失效的HDFS实例想要回滚到之前一个已知是正确的时间。

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