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Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?
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What is a Secondary Namenode? Is it a substitute to the Namenode?
How client application interacts with the NameNode?
What are the different types of Znodes?
Does hadoop always require digital data to process?
How to come out of the insert mode?
shouldn't DFS be able to handle large volumes of data already?
what is difference between int and intwritable?
Can NameNode and DataNode be a commodity hardware?
Can hbase run without hadoop?
What are the problems with Hadoop 1.0?
Which command is used for the retrieval of the status of daemons running the hadoop cluster?
On What concept the Hadoop framework works?
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