What is the default replication factor?
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What is zookeeper in hadoop?
How many instances of a jobtracker run on hadoop cluster?
What are the additional benefits YARN brings in to Hadoop?
What is Rack awareness?
How indexing is done in HDFS?
What is a Task instance in Hadoop? Where does it run?1
How to change replication factor of files already stored in HDFS?
What will you do when NameNode is down?
On what basis name node distribute blocks across the data nodes?
What are the functions of NameNode?
What problems have you faced when you are working on Hadoop code?
What is the default block size in Hadoop 1 and in Hadoop 2? Can it be changed?
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