What is a heartbeat in HDFS?
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What will you do when NameNode is down?
Explain how do ‘map’ and ‘reduce’ works?
Explain the shuffle?
What is Hadoop streaming?
How many Daemon processes run on a Hadoop system?
Can you give us some more details about ssh communication between masters and the slaves?
Is hadoop the future?
What are the stable versions of Hadoop?
What happens in a textinputformat?
How do you categorize a big data?
What do you mean by taskinstance?
Can we call vms as pseudos?