What Mapper does?
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Why do we use HDFS for applications having large data sets and not when there are lot of small files?
What is the InputFormat ?
What if a namenode has no data?
Why do we need a password-less ssh in fully distributed environment?
What is NoSQL?
Define a commodity hardware? Does commodity hardware include ram?
Why do we use Hadoop?
What is the difference between Hadoop and Traditional RDBMS?
What is a “Distributed Cache” in Apache Hadoop?
What is the port number for NameNode
What does the command mapred.job.tracker do?
What is keyvaluetextinputformat?
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