New Parquet files land in S3 hourly under evolving schemas. What automatically discovers schema changes and registers them in the Glue Data Catalog?
A.Glue crawlers on a schedule
Scheduled schema inference + catalog updates. Correct.
B.Athena DDL by hand
Manual DDL doesn't track schema evolution.
C.S3 event notifications
S3 events can TRIGGER crawlers but don't infer schemas themselves.
D.Glue DataBrew profiling
DataBrew profiles data visually — doesn't update the catalog.
Why this answer
Crawlers scan S3 paths on a schedule (or on-demand), infer schemas, and update Data Catalog tables/partitions automatically — the schema-discovery mechanism feeding Athena/EMR/Redshift Spectrum queries.
Correct answer: A · Last reviewed 2026-11-05
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