What is safe mode in Hadoop?
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Explain Erasure Coding in Apache Hadoop?
What is HDFS ? How it is different from traditional file systems?
Explain the core components of hadoop?
What do the master class and the output class do?
Is hadoop a database?
What is inputsplit in hadoop? Explain.
What happens to job tracker when namenode is down?
How does NameNode tackle DataNode failures?
What is the best hardware configuration to run Hadoop?
Define a datanode?
What do you know about keyvaluetextinputformat?
How many instances of a jobtracker run on hadoop cluster?