What are the core components of Hadoop?
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How can one check whether NameNode is working or not?
Whats the default port that jobtrackers listens ?
Is it possible to rename the output file, and if so, how?
How often do you need to reformat the namenode?
Explain what is speculative execution?
Ideally what should be the replication factor in hadoop?
Define a udf?
What is the use of recordreader in hadoop?
What happens if you don?t override the mapper methods and keep them as it is?
Explain is it possible to search for files using wildcards?
What does the high availability of a name-node means? How is it accomplished?
What are the network requirements for hadoop?
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