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What is Identity reducer?
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What does hadoop-env.sh do?
What happen if one of the datanodes has much slower cpu?
What is Disk Balancer in Hadoop?
Mention what are the most common input formats defined in hadoop?
How can one check whether NameNode is working or not?
Is hadoop still in demand?
What is the key difference between NameNode and DataNode in Hadoop?
After increasing the replication level, I still see that data is under replicated. What could be wrong?
Give examples of some companies that are using Hadoop structure?
What is the difference between an inputsplit and a block?
What is the basic difference between traditional RDBMS and Hadoop?
Mention what are the three modes in which hadoop can be run?
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