Give me the examples of Columnar database ?
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What does the file hadoop-metrics.properties do?
What is single node cluster in Hadoop? for what all purposes Hadoop run on a single node cluster?
What jobtracker is in hadoop? What are the activities followed by hadoop?
What is Reducer in Hadoop?
Explain in which directory hadoop is installed?
Explain how Hadoop cluster hardware planning and provisioning is done?
What is CAP Theorem? What aspects does Hadoop support from this theorem?
Explain the common input formats in hadoop?
What is TextInputFormat in Hadoop?
What is difference between reducer and combiner?
How can one write custom record reader?
Can you define udf?
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