What is a Task instance in Hadoop? Where does it run?1
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How to configure hadoop to reuse JVM for mappers?
What are the most commonly defined input formats in Hadoop?
Why the name ‘hadoop’?
What are the two main components of ResourceManager?
How to come out of the insert mode?
How a task is scheduled by a jobtracker?
What are the functions of NameNode?
Are Namenode and job tracker on the same host?
What is Rack Awareness in Apache Hadoop?
How to enable/configure the compression of map output data in hadoop?
Should we use RAID in Hadoop or not?
What is commodity hardware?
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