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Interview questions
What considerations are important when designing a dimensional model for a ridesharing app?
Write a query to remove duplicate records from a table while retaining the earliest entry.
Compare Hadoop and Spark. Which one would you choose for a real-time application, and why?
Explain how HDFS (Hadoop Distributed File System) stores data across nodes.
Explain how to schedule an automated task using Apache Airflow.
How do Spark transformations differ from actions? Provide examples of each.
How would you optimize Spark jobs for better performance?
What role does Kafka play in real-time data streaming pipelines?
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