Why do we need Hadoop?
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Why is Data Block size set to 128 MB in Hadoop?
What type of data we should put in distributed cache? When to put the data in dc? How much volume we should put in?
What is the default replication factor in Hadoop and how will you change it?
Mention what are the three modes in which hadoop can be run?
What is namenode?
Name the most common input formats defined in hadoop?
What is Mapper in Hadoop?
How do you overwrite replication factor?
What is difference between reducer and combiner?
What are the Features of Hadoop?
What is Combiner in Hadoop?
How namenode handles data node failures?
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