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Compare Apache Hadoop and Apache Spark?
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What is distributed copy (distcp)?
Is it possible to provide multiple input to Hadoop? If yes then how can you give multiple directories as input to the Hadoop job?
Can you define inputsplit in hadoop?
What is the difference between an inputsplit and a block?
How to do ‘map’ and ‘reduce’ works?
What are the main features and Characteristics of Hadoop which makes it the most popular and powerful Big Data tool?
Define a udf?
List some use cases where classification machine learning algorithms can be used.
If DataNode increases, then do we need to upgrade NameNode?
What is Federation?
How can one check whether NameNode is working or not?
Have you ever used counters in hadoop?
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