What is a combiner in hadoop?
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When we send a data to a node, do we allow settling in time, before sending another data to that node?
What does rack awareness algorithm means?
What does secondary name-node means?
How often do you need to reformat the namenode?
What is Mapper? How can we compress Mapper output in Hadoop?
What is 'jps'?
Have you ever used counters in hadoop?
What is the use of context object?
What is a Backup node in Hadoop?
Is it possible to have hadoop job output in multiple directories? If yes, how?
Clarify what is sqoop in hadoop?
What is the role of the namenode?
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