It requires more than one year of work experience on data analysis posts or passing CDA Level I certification. CDA Level II Big Data Analyst specifically refers to personnel working on data analysis and cloud big data in Internet, retail, finance, telecom, medical science, tourism and other industries. In addition to Level I, candidates must be familiar with Python and Linux OS knowledge, mastery and application of Hadoop, Hive, Spark and other professional big data architecture and software, extracting relevant information from mass data, conducting big data analysis based on relevant machine learning algorithms, and forming rigorous big data analysis reports.