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Professional Data Engineer

  • Topic 1 Question 145

    You receive data files in CSV format monthly from a third party. You need to cleanse this data, but every third month the schema of the files changes. Your requirements for implementing these transformations include: ✑ Executing the transformations on a schedule ✑ Enabling non-developer analysts to modify transformations ✑ Providing a graphical tool for designing transformations What should you do?

    • Use Dataprep by Trifacta to build and maintain the transformation recipes, and execute them on a scheduled basis

    • Load each month's CSV data into BigQuery, and write a SQL query to transform the data to a standard schema. Merge the transformed tables together with a SQL query

    • Help the analysts write a Dataflow pipeline in Python to perform the transformation. The Python code should be stored in a revision control system and modified as the incoming data's schema changes

    • Use Apache Spark on Dataproc to infer the schema of the CSV file before creating a Dataframe. Then implement the transformations in Spark SQL before writing the data out to Cloud Storage and loading into BigQuery

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