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How to debug Hadoop code?
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What is rack awareness in hadoop?
Explain what happens when hadoop spawned 50 tasks for a job and one of the task failed?
What is Mapper in Hadoop?
If DataNode increases, then do we need to upgrade NameNode in Hadoop?
Is it possible to have hadoop job output in multiple directories?
Explain what is jobtracker in hadoop? What are the actions followed by hadoop?
Ideally what should be the replication factor in hadoop?
Why we use intwritable instead of int? Why we use longwritable instead of long?
Explain the Single point of Failure in Hadoop?
Is it possible to provide multiple input to Hadoop? If yes then how can you give multiple directories as input to the Hadoop job?
What does rack awareness algorithm means?
We have already sql then why nosql?
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