How often DataNode send heartbeat to NameNode in Hadoop?
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Is it possible to have hadoop job output in multiple directories?
What does hadoop-env.sh do?
What a task tracker is in hadoop?
Hadoop achieves parallelism by dividing the tasks across many nodes, it is possible for a few slow nodes to rate-limit the rest of the program and slow down the program. What mechanism Hadoop provides to combat this?
Which object can be used to get the progress of a particular job
How can you set an arbitrary number of Reducers to be created for a job in Hadoop?
Mention what are the most common input formats defined in hadoop?
Compare Hadoop and RDBMS?
Explain Erasure Coding in Hadoop?
What are the limitations of Hadoop?
What are the side data distribution techniques?
What is replication factor?
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