How often do you need to reformat the namenode?
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What is Identity reducer?
Clarify what a task tracker is in hadoop?
Tell me some major benefits of Hadoop?
If datanodes increase, then do we need to upgrade namenode?
What are the main components in Hadoop Eco-System and what are their functions ?
What is a Heartbeat in Hadoop?
What is a commodity hardware? Does commodity hardware include RAM?
what is next step after mapper or maptask?
Where is hadoop-env.sh file present?
Give me examples of unstructured data?
What a task tracker is in hadoop?
What does the mapred.job.tracker command do?
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