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Give me the examples of Columnar database ?
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What is the difference between namenode and datanode in hadoop?
How does hadoop achieve fault tolerance?
Are job tracker and task trackers present in separate machines?
What happens when two clients try to access the same file in the hdfs?
What is the use of context object?
Give examples of some companies that are using Hadoop structure?
Is hadoop still in demand?
What are input format, input split & record reader and what they do?
How NameNode tackle Datanode failures in Hadoop?
Name the most common Input Formats defined in Hadoop? Which one is default?
What is Fault Tolerance?
What is the relationship between Jobs and Tasks in Hadoop?
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