What is data cleansing?
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What happen if number of reducer is set to 0 in Hadoop?
How can we create a hadoop cluster from scratch?
What happens if one hadoop client renames a file or a directory containing this file while another client is still writing into it?
Explain what is sequencefileinputformat?
What is High Availability feature in Hadoop2?
Clarify how ordering in hdfs is finished?
What is the key difference between NameNode and DataNode in Hadoop?
Explain the core methods of the reducer?
What is fsck?
What are the four basic parameters of a mapper?
What is the role of the namenode?
What are the tools used in big data?
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