What Mapper does?
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What is the functionality of jobtracker in hadoop?
What do you know about nlineoutputformat?
What is the problem with small files in Apache Hadoop?
Explain the master class and the output class do?
What is a spill factor with respect to the ram?
What is the difference between hadoop and other data processing tools?
How to keep HDFS cluster balanced?
Suppose Hadoop spawned 100 tasks for a job and one of the task failed. What will Hadoop do?
What is HDFS High Availability?
Where is the Mapper Output stored?
What are the different types of Znodes?
Why do we use HDFS for applications having large data sets and not when there are lot of small files?