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An existing job running longer suddenly: how to analyze the issue?

General/Othermedium0.4 min read

**STAR approach**: **Situation**: Job ran 2 hr, now 6 hr. **Task**: Find root cause. **Analysis**: (1) Data volume growth—compare input size. (2) Skew—Spark UI shows uneven partitions. (3) Resource contention—other jobs. (4) Source throttling—DB or API limits. (5) Partition...

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Frequency
Low
Asked at 1 company
Category
243
questions in General/Other
Difficulty Split
151E|43M|49H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Citi
Interview Pro Tip

Pro-Move: 'We had a job slow 3×—Spark UI showed 1 partition at 2hr; added salting, back to 30min.' Red Flag: Restarting or adding resources without diagnosing—mask the problem.

Key Concepts Tested
partitionspark

Why This Question Matters

This medium-level General/Other question appears frequently in data engineering interviews at companies like Citi. While less common, it tests deeper understanding that distinguishes strong candidates. Mastering the underlying concepts (partition, spark) will help you answer variations of this question confidently.

How to Approach This

Break this problem into components. Identify the core trade-offs involved, then walk the interviewer through your reasoning step by step. Demonstrate awareness of edge cases and production considerations - this is what separates good answers from great ones.

Expert Answer
71 words

STAR approach: Situation: Job ran 2 hr, now 6 hr. Task: Find root cause. Analysis: (1) Data volume growth—compare input size. (2) Skew—Spark UI shows uneven partitions. (3) Resource contention—other jobs. (4) Source throttling—DB or API limits. (5) Partition pruning—missing partitions? Actions: Add partitions; salting for skew; increase resources; fix source limits. Result: Document in runbook; add monitoring. Best practice: Compare metrics (input GB, partition count); use Spark UI for skew.

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