Is secondary namenode a substitute to the namenode?
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What platform and java version are required to run hadoop?
What are active and passive "NameNodes"?
What are the functionalities of jobtracker?
What is the default block size in Hadoop 1 and in Hadoop 2? Can it be changed?
What is the meaning of speculative execution in Hadoop? Why is it important?
What is a “Distributed Cache” in Apache Hadoop?
What does job conf class do?
Why are the number of splits equal to the number of maps?
Which is the best hadoop certification?
Define a combiner?
how can we change Replication Factor?
Why do we use Hadoop?
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