What is Writable & WritableComparable interface?
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What is column families? What happens if you alter the block size of ColumnFamily on an already populated database?
How does NameNode tackle DataNode failures?
What do you know about keyvaluetextinputformat?
What is Row Key?
What is keyvaluetextinputformat?
Which command is used for the retrieval of the status of daemons running the hadoop cluster?
Explain a simple Map/Reduce problem.
What is the full form of fsck?
What is 'Key value pair' in HDFS?
Where do you specify the Mapper Implementation?
Explain why do we need hadoop?
when hadoop enter in safe mode?
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