Where is the Mapper Output stored?
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Explain what is sqoop in Hadoop ?
Why is Apache Spark faster than Apache Hadoop?
What is HDFS Block size? How is it different from traditional file system block size?
Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?
Why the name ‘hadoop’?
Can you explain how do ‘map’ and ‘reduce’ work?
What do you know about nlineoutputformat?
How will format the HDFS ?
What is MapFile?
How to resolve IOException: Cannot create directory
In cloudera there is already a cluster, but if I want to form a cluster on ubuntu can we do it?
Does hadoop always require digital data to process?
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