Databricks-Certified-Professional-Data-Engineer: Databricks Certified Data Engineer Professional Spark Practice Questions
The free Databricks-Certified-Professional-Data-Engineer: Databricks Certified Data Engineer Professional questions that deal with spark, with answers and explanations. The full bank and the timed practice test cover every topic the exam asks about.
Question #7
Which of the following technologies can be used to identify key areas of text when parsing Spark Driver log4j output?
Correct answer: A
Explanation
Regex, or regular expressions, are a powerful way of matching patterns in text. They can be used to identify key areas of text when parsing Spark Driver log4j output, such as the log level, the timestamp, the thread name, the class name, the method name, and the message. Regex can be applied in various languages and frameworks, such as Scala, Python, Java, Spark SQL, and Databricks notebooks. References: • https://docs.databricks.com/notebooks/notebooks-use.html#use-regular-expressions • https://docs.databricks.com/spark/latest/spark-sql/udf-scala.html#using-regular- expressions-in-udfs • https://docs.databricks.com/spark/latest/sparkr/functions/regexp_extract.html • https://docs.databricks.com/spark/latest/sparkr/functions/regexp_replace.html
Question #10
Which statement characterizes the general programming model used by Spark Structured Streaming?
Correct answer: D
Explanation
This is the correct answer because it characterizes the general programming model used by Spark Structured Streaming, which is to treat a live data stream as a table that is being continuously appended. This leads to a new stream processing model that is very similar to a batch processing model, where users can express their streaming computation using the same Dataset/DataFrame API as they would use for static data. The Spark SQL engine will take care of running the streaming query incrementally and continuously and updating the final result as streaming data continues to arrive. Verified References: [Databricks Certified Data Engineer Professional], under “Structured Streaming” section; Databricks Documentation, under “Overview” section.
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