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Real questions from top companies · hard
Explain the difference between TriggerDagRunOperator and ExternalTaskSensor in Airflow.
Explain the difference between coalescing and repartitioning in Spark
Explain the differences between Spark's shuffle and broadcast join. When would you use each?
Explain the impact of Vacuum and Analyze operations on performance.
Explain the role of DAGs (Directed Acyclic Graphs) in Spark.
Explain your choice of streaming framework (Kafka, Spark Streaming, etc.).
Fault Tolerance in Spark vs. Hadoop?
Given a DataFrame with columns id and name, add a new column department: If id < 100 assign HR, if id >= 100 and id < 200 assign admin.
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