Explain how is hadoop different from other data processing tools?
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What do shuffling do?
What is Safemode in Apache Hadoop?
Explain the use of .mecia class?
How is the option in Hadoop to skip the bad records?
Who invented hadoop?
How to resolve small file problem in hdfs?
Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?
What is the default block size in hdfs?
Explain the master class and the output class do?
How the Client communicates with HDFS?
How is security achieved in Apache Hadoop?
What is DistributedCache and its purpose?
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