what is a datanode?
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What is the difference between SQL and NoSQL?
What are the modes in which Apache Hadoop run?
What are the limitations of importing RDBMS tables into Hcatalog directly?
Explain the master class and the output class do?
How to use Apache Zookeeper command line interface?
What is IdentityMapper?
How is security achieved in Apache Hadoop?
How the HDFS Blocks are replicated?
How does NameNode tackle DataNode failures?
What is the communication channel between client and namenode/datanode?
What is the purpose of RawComparator interface?
What is the meaning of speculative execution in Hadoop? Why is it important?
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