Where is hadoop-env.sh file present?
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How to do ‘map’ and ‘reduce’ works?
What jobtracker is in hadoop? What are the activities followed by hadoop?
Can you explain edge nodes in hadoop?
If datanodes increase, then do we need to upgrade namenode?
Can you explain textinformat?
Mention how hadoop is different from other data processing tools?
What is single node cluster in Hadoop? for what all purposes Hadoop run on a single node cluster?
Explain how Hadoop cluster hardware planning and provisioning is done?
What does the mapred.job.tracker command do?
What is a Heartbeat in Hadoop?
When and how to create hadoop archive?
Give me the examples of Columnar database ?
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