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How to resolve small file problem in hdfs?
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In which location Name Node stores its Metadata and why?
How can we look for the namenode in the browser?
What is the purpose of RawComparator interface?
Explain what if rack 2 and datanode fails?
What is the functionality of jobtracker in hadoop? How many instances of a jobtracker run on hadoop cluster?
Is hadoop based on google mapreduce?
Explain the basic architecture of Hadoop?
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What is the default block size in Hadoop 1 and in Hadoop 2? Can it be changed?
How do you define "block" in HDFS?
What are the functionalities of jobtracker?
What is the communication channel between client and namenode/datanode?
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