What is the purpose of RawComparator interface?
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What are the modules that constitute the Apache Hadoop 2.0 framework?
What is InputSplit and RecordReader?
Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?
What mechanism does hadoop framework provides to synchronize changes made in distribution cache during runtime of the application?
What is Rack Awareness in Apache Hadoop?
What Mapper does?
What are the network requirements for using hadoop?
Explain the Job OutputFormat?
What is salary of hadoop developer?
What is difference between secondary namenode, checkpoint namenode & backupnod secondary namenode, a poorly named component of hadoop?
What is a Secondary Namenode? Is it a substitute to the Namenode?
Can we do online transactions(oltp) using hadoop?
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