What Hadoop Left Behind
Read inherited Hadoop systems through storage, catalogs, replica repair, mapper-local combining, retry boundaries, and workload migration.
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External Tables and the Lake/Warehouse Boundary
An external table exposes files to SQL. Learn when to load a managed copy and how registration, updates, and snapshots affect correctness.
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Data Formats: Parquet, ORC, Avro, and Arrow
Learn what each format stores, how readers skip data, and which schema and layout choices change analytical work.
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Storage Tiering, Lifecycle, and Archival
Choose storage tiers from access and recovery needs, lifecycle filters, version retention, holds, and restoration checks.
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Designing an Object-Storage Data Lake
Build a data lake with discoverable datasets, immutable runs, conditional publication, safe cleanup, and layouts matched to queries.