Architectural logic: Athena is serverless Presto/Trino—no cluster to manage; you pay per TB scanned. Why this model: Perfect for ad-hoc analytics on data lakes; decouples storage (S3) from compute. S3 interaction: Athena reads directly from S3; no ETL load step. Glue Catalog...
Red Flag: Queries without partition predicates on large tables—cost explosion. Pro-Move: 'We partition by date and use Parquet; our 100TB table costs $50/query instead of $500—we enforce partition filters in IAM.'
This medium-level Cloud/Tools question appears frequently in data engineering interviews at companies like Persistent Systems. While less common, it tests deeper understanding that distinguishes strong candidates. Mastering the underlying concepts (etl, partition) will help you answer variations of this question confidently.
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.
Architectural logic: Athena is serverless Presto/Trino—no cluster to manage; you pay per TB scanned. Why this model: Perfect for ad-hoc analytics on data lakes; decouples storage (S3) from compute. S3 interaction: Athena reads directly from S3; no ETL load step. Glue Catalog provides schema; queries scan only relevant partitions and columnar bytes. Scalability: Unlimited concurrency; each query spins up its own cluster. Cost implications: $5/TB scanned—partitioning and Parquet can reduce scans 10–100x vs CSV/JSON. Example: s3://bucket/events/year=2024/month=03/*.parquet—query with WHERE year=2024 AND month=3 prunes to March only. Trade-off: Cold start ~1–2s; for sub-second latency use Redshift or caching.
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Analyze My Answer — FreeAccording to DataEngPrep.tech, this is one of the most frequently asked Cloud/Tools 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.