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What is HDFS Federation?
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shouldn't DFS be able to handle large volumes of data already?
Did you ever built a production process in hadoop ? If yes then what was the process when your hadoop job fails due to any reason?
Explain the basic difference between traditional rdbms and hadoop?
What is the functionality of jobtracker in hadoop? How many instances of a jobtracker run on hadoop cluster?
What is Hadoop streaming?
What is the default block size in Hadoop 1 and in Hadoop 2? Can it be changed?
What is yarn in hadoop?
What are the site-specific configuration files in Hadoop?
How to resolve small file problem in hdfs?
What do you know about nlineoutputformat?
What if rack 2 and datanode fails?
What does the command mapred.job.tracker do?
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