Real questions from top companies in Spark/Big Data
Steps to link a Databricks notebook to an ADF pipeline
Steps to mount storage in Databricks.
Suppose you have a DAG that ingests data from multiple databases. How would you increase task parallelism in Airflow to improve performance without overloading the system?
Suppose you need to import 5 tables from an external RDBMS (like MySQL) into Hadoop HDFS. Write the Sqoop command
Task Dependencies in DAG
Trade-offs between batch processing (Spark) vs. real-time streams (Kafka)
Transformation vs. Action in PySpark?
Usage of UDFs?
Walk through how you would debug the data ingestion process to identify slow stages.
Walkthrough Spark's architecture, focusing on driver, executors, and DAGs
What Hadoop command would you use to merge multiple files into one?
What are Spark optimizations, and can you explain them?
What are the advantages of using Delta Lake over Parquet?
What are the differences between %pip and %conda commands in Databricks?
What are the different modes in which you can submit Spark jobs? Explain each.
What are the limitations of the REORG command with respect to large datasets?
What are the performance considerations when using Auto Loader?
What are transient clusters in EMR, and when would you use them?
What causes Out of Memory (OOM) issues in Databricks, and how do you resolve them?
What is Predicate Pushdown and AQE with Example
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