How Mapper is instantiated in a running job?
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What is a block and block scanner in HDFS?
What is the difference between hadoop and other data processing tools?
How can one increase replication factor to a desired value in Hadoop?
What is column families? What happens if you alter the block size of ColumnFamily on an already populated database?
Explain why the name ‘hadoop’?
Define a namenode?
What will be the consideration while we do Hardware Planning for Master in Hadoop architecture?
Explain the wordcount implementation via hadoop framework ?
Does this lead to security issues?
What is the purpose of RawComparator interface?
What is a 'block' in HDFS?
What do you know about keyvaluetextinputformat?
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