Where are Hadoop’s configuration files located?
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Define a udf?
While starting hadoop services, datanode service is not running?
What is High Availability feature in Hadoop2?
What is TextInputFormat in Hadoop?
How can one check whether NameNode is working or not?
What are the important modes of hadoop?
What is configured in /etc/hosts and what is its role in setting Hadoop cluster?
If DataNode increases, then do we need to upgrade NameNode?
How many job tracker processes can run on a single Hadoop cluster?
What are the major differences between Hadoop 2 and Hadoop 3?
Mention what daemons run on a master node and slave nodes?
Mention what is distributed cache in hadoop?
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