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Spark Interview Questions

14 real Spark questions asked in live technical interviews — each with a model answer. Updated weekly.

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When you execute this notebook, how many stages will be created in the backend?🟡 Medium · Conceptual · Asked 25×Imagine you need to process a large daily dataset on E‑D. You are using PySpark on EMR, but the input volume suddenly doubles and the job starts missing its SLE because of skew and shuffle. How would you redesign the job and the EMR setup to keep it both fast and cost‑efficient?🟡 Medium · Conceptual · Asked 1×In a real project, tell me about a time you had to troubleshoot an EMR issue that affected performance. What specific steps did you take to isolate the root cause?🟡 Medium · Behavioral · Asked 1×How would you use a Spark window function with row_number() partitioned by customer and ordered by timestamp descending to get the latest order per customer?🟡 Medium · Coding · Asked 1×What is the difference between repartition and coalesce?🟡 Medium · Conceptual · Asked 1×What is a PySpark job?🟡 Medium · Conceptual · Asked 1×What is a PySpark job?🟡 Medium · Conceptual · Asked 1×Can you explain how you assign clusters and lead a team?🟡 Medium · System Design · Asked 1×What are the different types of join strategies in Spark, and which one should you use at a time?🔴 Hard · System Design · Asked 1×What is the difference between repartition and coalesce in Spark, and how could choosing the wrong one lead to production issues?🔴 Hard · System Design · Asked 1×Can you explain the difference between repartition and partition in Spark, and what are the potential production issues if either one is chosen incorrectly?🔴 Hard · System Design · Asked 1×Can you explain the difference between repartition and partition in Spark, and what are the potential production issues if either one is chosen incorrectly?🔴 Hard · System Design · Asked 1×Can you explain the difference between repartition and partition in Spark, and what are the potential production issues if either one is chosen incorrectly?🔴 Hard · System Design · Asked 1×Can you explain the difference between repartition and partition in Spark?🟡 Medium · Conceptual · Asked 1×

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