Can you explain how do ‘map’ and ‘reduce’ work?
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What is your favourite tool in the hadoop ecosystem?
How many maximum jvm can run on a slave node?
What exactly is hadoop?
Explain the Job OutputFormat?
What will you do when NameNode is down?
How to enable recycle bin or trash in hadoop?
What are the port numbers of namenode, job tracker and task tracker?
What is the problem with small files in Apache Hadoop?
Explain how input and output data format of the hadoop framework?
Explain how is hadoop different from other data processing tools?
What are the two main components of ResourceManager?
What do you mean by taskinstance?