What is the use of Combiner?
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What is a secondary namenode?
Explain the basic architecture of Hadoop?
How Mapper is instantiated in a running job?
What is a JobTracker in Hadoop? How many instances of JobTracker run on a Hadoop Cluster?
In which location Name Node stores its Metadata and why?
Can you give us some more details about ssh communication between masters and the slaves?
Can Hadoop be compared to NOSQL database like Cassandra?
What is the meaning of speculative execution in Hadoop? Why is it important?
What is keyvaluetextinputformat?
What is a 'block' in HDFS?
Define fault tolerance?
Define a daemon?
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