What is Row Key?
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What is HDFS block size and what did you chose in your project?
Is it necessary to write jobs for hadoop in the java language?
What do you know about keyvaluetextinputformat?
What are the steps to submit a Hadoop job?
Explain the use of .mecia class?
Suppose Hadoop spawned 100 tasks for a job and one of the task failed. What will Hadoop do?
What is the purpose of RawComparator interface?
What is a task instance in hadoop? Where does it run?
Is map like a pointer?
How is security achieved in Apache Hadoop?
If a data Node is full how it's identified?
What's the best way to copy files between HDFS clusters?
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