IT Career Guides & Free Resources
Expert roadmaps, tutorials, salary guides and interview prep across Data Science, Generative AI, Python, Cloud & Analytics — written by GloryTecks trainers in Hyderabad.
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Spark vs Hadoop: What Changed and Why
What changed when Spark overtook Hadoop MapReduce: the three parts of Hadoop, the MapReduce model emulated step by step on three million taxi trips with its intermediate data written to disk, why in-memory processing and DAGs mattered, what Spark still borrows from Hadoop, and what that means today.
Hadoop Interview Questions and Answers
Hadoop still comes up in data engineering interviews, usually as questions about how HDFS and MapReduce work underneath. Four are answered by running a real Hadoop 3.4.1 node on two million household power readings: block counts, an under-replicated file, 31 small files and a MapReduce job with its counters.