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Data Lake and Warehouse Architecture Questions

Designing scalable data platforms for analytical and reporting workloads including data lakes, data warehouses, and lakehouse architectures. Key topics include storage formats and layout including columnar file formats such as Parquet and table formats such as Iceberg and Delta Lake, partitioning and compaction strategies, metadata management and cataloging, schema evolution and transactional guarantees for analytical data, and cost and performance trade offs. Cover ingestion patterns for batch and streaming data including change data capture, data transformation approaches and compute engines for analytical queries, partition pruning and predicate pushdown, query optimization and materialized views, data modeling for analytical workloads, retention and tiering, security and access control, data governance and lineage, and integration with business intelligence and real time analytics. Also discuss operational concerns such as monitoring, vacuuming and compaction jobs, metadata scaling, and strategies for minimizing query latency while controlling storage cost.

HardTechnical
0 practiced
Describe practical strategies to minimize the impact of metadata-heavy queries on the metadata service (e.g., Glue or Hive Metastore) including caching, query planning separation, and pre-warmed workers. How would you protect the metastore from high-concurrency query spikes?
HardTechnical
0 practiced
A BI user complains that a nightly aggregate table sometimes shows inconsistent numbers after upstream reprocesses. Describe operations and architectural changes to make downstream aggregates resilient to upstream backfills and reprocesses (consider lineage, atomic swaps, and incremental idempotent writes).
HardTechnical
0 practiced
Explain how you would implement data retention 'soft-delete' and 'hard-delete' semantics for GDPR compliance in a data lake. Detail how you would handle backups, snapshots, and time-travel features that might retain deleted data.
EasyTechnical
0 practiced
Explain the trade-offs between ETL (transform before load) and ELT (load then transform) in the context of cloud data lakes and warehouses. Provide at least two scenarios where ETL is preferable and two where ELT is preferable.
MediumTechnical
0 practiced
A report team needs daily snapshots of a slowly changing dimension (SCD Type 2) in your warehouse. Explain how you'd implement SCD Type 2 using a data lake/lakehouse architecture. Discuss keys, effective date ranges, updates vs inserts, and how to query the current and historical state efficiently.

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