Top 50 hadoop Interview Questions
The most frequently asked hadoop questions across all roles and companies, ranked by real interview frequency. Updated daily.
Use PostgreSQL joins and aggregation to expose missing candidates, tests, submissions, and NULL join values.
Aggregate completed revenue and rank customers within each region, including customers with no qualifying orders.
EXL ServiceUse joins, aggregation, CTEs, ranking, and CASE logic to summarize customer sales by region.
Walmart Global TechTests ownership and communication in a real big data environment, including how you handled technical tradeoffs and delivered measurable impact.
Experian
Berkeley Research Group
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Design a zero-downtime migration from legacy Hadoop to a modern cloud data warehouse with synchronized data and reversible cutover.
CiscoExplain how to partition CVS pipeline data in Hadoop for efficient storage, parallel processing, pruning, and reliable maintenance.
CVSExplain Hadoop's core components and illustrate a MapReduce job with a practical word-count example.
phDataAssesses your understanding of common big data technologies and how they relate in pipelines.
CoforgeEvaluates your understanding of big data processing frameworks and when each is appropriate.
Sun Life Financial
Sun LifeAssesses your understanding of distributed systems reliability and failure handling.
athenahealth