How can one write custom record reader?
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After the Map phase finishes, the Hadoop framework does 'Partitioning, Shuffle and sort'. Explain what happens in this phase?
How does speculative execution work in Hadoop?
Why aggregation cannot be done in Mapper?
What is Mapper in Hadoop?
What are the main components of hadoop?
Explain what happens when hadoop spawned 50 tasks for a job and one of the task failed?
What does rack awareness mean?
What does jps command do in Hadoop?
List of the some best tools that can be useful for data-analysis?
Which one is default?
What are some typical functions of job tracker in hadoop?
Can we create a hadoop cluster from scratch?
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