The first coding test link was provided and contained 4 coding questions, with difficulty levels ranging from LeetCode medium to hard.

In the first interview round, they asked DSA questions, Spark theory, Scala theory, and SQL questions.

Round 1

Coding Questions:

• Write a program to count the number of binary 1s in a number. Example: For 7, the output should be 3.
• Write a program to check whether the given input contains valid parentheses.

SQL Question:

List all employees whose salary is greater than the average salary of their respective department.

Scala Theory Question:

What is implicit in Scala?

Spark Questions:

• How do you copy data from HDFS to the local file system?
• What is the command for spark-submit?
• What is the difference between reduceByKey and groupByKey?
• What happens during a broadcast join in Spark, and how does it reduce shuffling?
• What happens when you use the collect() action in Spark?
• How do you define the minimum and maximum number of executors in Spark?