What is Apache Hadoop? Why is Hadoop essential for every Big Data application?
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Which is the best hadoop certification?
What is the difference between a Hadoop and Relational Database and Nosql?
Explain why the name ‘hadoop’?
What does job conf class do?
What is Writable & WritableComparable interface?
Define tasktracker.
What are the problems with Hadoop 1.0?
Why do we need a password-less ssh in fully distributed environment?
What is HDFS ? How it is different from traditional file systems?
How the Client communicates with HDFS?
How to come out of the insert mode?
Can the balancer be run while Hadoop is in use?
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