What is the purpose of DataNode block scanner?
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What is compute and Storage nodes?
What mechanism does hadoop framework provides to synchronize changes made in distribution cache during runtime of the application?
What is column families? What happens if you alter the block size of ColumnFamily on an already populated database?
Why are the number of splits equal to the number of maps?
Which are the two types of 'writes' in HDFS?
Can you explain how do ‘map’ and ‘reduce’ work?
What is inputformat in hadoop?
how can we change Replication Factor?
What are the limitations of importing RDBMS tables into Hcatalog directly?
What is Rack awareness?
How to come out of the insert mode?
Explain what happens in textinformat ?