Why aggregation cannot be done in Mapper?
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How can you set an arbitrary number of Reducers to be created for a job in Hadoop?
If no custom partitioner is defined in Hadoop then how is data partitioned before it is sent to the reducer?
Compare Hadoop 2 and Hadoop 3?
What do you know about yarn?
What do you understand by standalone (or local) mode?
Explain what is storage and compute nodes?
After the Map phase finishes, the Hadoop framework does 'Partitioning, Shuffle and sort'. Explain what happens in this phase?
Explain what is sequencefileinputformat?
Give me the examples of Columnar database ?
How Hadoop is cost-effective?
Mention what are the three modes in which hadoop can be run?
If datanodes increase, then do we need to upgrade namenode?
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