Give a brief overview of Hadoop history?
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What is namenode?
What are the restriction to the key and value class ?
What is Disk Balancer in Hadoop?
What is Identity reducer?
What is TextInputFormat in Hadoop?
What happens if number of reducers are 0?
List some use cases where classification machine learning algorithms can be used.
Comparison between Secondary NameNode and Checkpoint Node in Hadoop?
Which one is default?
Why do we need Hadoop?
How many job tracker processes can run on a single Hadoop cluster?
Explain how is data partitioned before it is sent to the reducer if no custom partitioner is defined in hadoop?
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