What are the different methods to run Spark over Apache Hadoop?
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How many instances of a jobtracker run on hadoop cluster?
What is the difference between Apache Hadoop and RDBMS?
What is HDFS Block size? How is it different from traditional file system block size?
What does the command mapred.job.tracker do?
How can we check whether namenode is working or not?
Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?
What is a checkpoint?
What is the difference between traditional RDBMS and Hadoop?
Is hadoop obsolete?
Define a task tracker?
What are the functionalities of jobtracker?
How client application interacts with the NameNode?
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