Define a metadata?
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What are the basic available commands in Hadoop sqoop ?
Explain the use of tasktracker in the hadoop cluster?
Can you tell us more about ssh?
Can Hadoop be compared to NOSQL database like Cassandra?
what should be the ideal replication factor in hadoop?
Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?
What is the full form of fsck?
What does /var/hadoop/pids do?
How client application interacts with the NameNode?
Does Hadoop requires RAID?
How we can change Replication factor when Data is on the fly?
Suppose Hadoop spawned 100 tasks for a job and one of the task failed. What will Hadoop do?