Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?
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How blocks are distributed among all data nodes for a particular chunk of data?
What does /var/hadoop/pids do?
How do you categorize a big data?
What is Hadoop serialization?
What are the network requirements for using hadoop?
Does Hadoop requires RAID?
What are channel selectors?
What do you know by storage and compute node?
What is the sequencefileinputformat in hadoop?
What are the functions of NameNode?
What is Apache Hadoop? Why is Hadoop essential for every Big Data application?
Explain the shuffle?