Virtual memory: Each process gets large address space; OS maps pages to physical frames; demand paging; swap when RAM full. WHY: Isolation; working set > RAM. For DE: Excessive swap (si/so in vmstat) kills performance. SCALABILITY: Size Spark executors to avoid swap....
This easy-level General/Other question appears frequently in data engineering interviews at companies like ZS Associates. While less common, it tests deeper understanding that distinguishes strong candidates. Mastering the underlying concepts (spark) will help you answer variations of this question confidently.
Start by clearly defining the core concept being asked about. Interviewers want to see that you understand the fundamentals before diving into implementation details. Structure your answer with a definition, then explain the practical application with a concise example.
Virtual memory: Each process gets large address space; OS maps pages to physical frames; demand paging; swap when RAM full. WHY: Isolation; working set > RAM. For DE: Excessive swap (si/so in vmstat) kills performance. SCALABILITY: Size Spark executors to avoid swap. COST: Swap is 1000x slower than RAM; tune JVM heap to leave OS headroom.
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Analyze My Answer — FreeAccording to DataEngPrep.tech, this is one of the most frequently asked General/Other interview questions, reported at 1 company. DataEngPrep.tech maintains a curated database of 1,863+ real data engineering interview questions across 7 categories, verified by industry professionals.