Explain how do ‘map’ and ‘reduce’ works?
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What is the Use of SSH in Hadoop ?
How is HDFS fault tolerant?
Which are the two types of 'writes' in HDFS?
Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?
What is version-id mismatch error in hadoop?
What is a task instance in hadoop? Where does it run?
How to configure hadoop to reuse JVM for mappers?
What does /etc /init.d do?
Why is hadoop faster?
What does the command mapred.job.tracker do?
What is zookeeper in hadoop?
Explain how input and output data format of the hadoop framework?
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