What is Amazon Athena, and how does it relate to Amazon S3 and MapReduce?
💡 Model Answer
Amazon Athena is a serverless, interactive query service that lets you analyze data directly in Amazon S3 using standard SQL. Athena uses Presto under the hood and automatically provisions the compute resources you need. Because Athena reads data from S3, you can store raw, semi‑structured, or structured files (Parquet, ORC, JSON, CSV) and query them without ETL. Athena can also integrate with AWS Glue for schema discovery and cataloging. MapReduce, typically run on Amazon EMR, is a batch processing framework that can transform and aggregate large datasets. While Athena is optimized for ad‑hoc queries and quick analytics, MapReduce is suited for heavy data transformations. In many pipelines, you might use EMR to process data into a columnar format and then query it with Athena for reporting.
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