what are the nodes in the Hadoop cluster?
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What happens to a NameNode that has no data?
What is nlineoutputformat?
Is it necessary to know java to learn hadoop?
What is a Combiner?
What do the master class and the output class do?
On what basis Namenode will decide which datanode to write on?
Suppose Hadoop spawned 100 tasks for a job and one of the task failed. What will Hadoop do?
What is rack-aware replica placement policy?
Explain the difference between gen1 and gen2 hadoop with regards to the namenode?
Define a job tracker?
Why do we use HDFS for applications having large data sets and not when there are lot of small files?
Define streaming access?
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