What is formatting of the dfs?
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Which command is used for the retrieval of the status of daemons running the hadoop cluster?
What are the problems with Hadoop 1.0?
Explain the shuffle?
What is IdentityMapper?
Where is the Mapper Output stored?
What is the functionality of jobtracker in hadoop? How many instances of a jobtracker run on hadoop cluster?
What is a Secondary Namenode? Is it a substitute to the Namenode?
What are the four characteristics of Big Data?
What are the limitations of importing RDBMS tables into Hcatalog directly?
Explain what if rack 2 and datanode fails?
Mention what is the use of Context Object?
What is a Task instance in Hadoop? Where does it run?1