Real questions from top companies in Spark/Big Data · medium
Transformation vs. Action in PySpark?
What Hadoop command would you use to merge multiple files into one?
What are Spark Submit properties?
What are the key differences between Map and Reduce in Spark?
What are the key performance tuning techniques you apply in Spark jobs to improve performance?
What are the limitations of the REORG command with respect to large datasets?
What are the performance trade-offs of using salting to mitigate data skewness?
What are the steps to efficiently process 1 TB of data in Spark?
What causes Out of Memory (OOM) issues in Databricks, and how do you resolve them?
What causes data skewness in Spark, and how can it be resolved?
What configuration parameters are critical for enabling AQE effectively?
What determines the maximum parallelism achievable in Databricks?
What do you understand by data shuffling in Spark? Why is it important?
What is Broadcast Join and Why is It Required?
What is Shuffle and How to Handle It in Spark
What is offset management in Kafka?
What is the advantage of caching in PySpark? When and why would you use it?
What is the command to import data from HDFS to Hive?
What is the difference between partitions and repartitions in Spark, and when do you use each?
What is the most common performance bottleneck in Spark jobs, and how would you resolve it?
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