在海量数据处理中可以用到，对大量数据的预处理，可以知道数据分布情况，并进行归类。 -In the mass data processing can be used for a large number of pre-processing of data, we can know the distribution of data, and collation.

利用Python和Spark进行海量数据的实时分析，解决商业方案(Using Python and Spark to do real-time analysis of mass data, and to solve business solutions)