What is Mapper? How can we compress Mapper output in Hadoop?
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Explain Data Locality in Hadoop?
Explain how jobtracker schedules a task?
What are the different commands used to startup and shutdown Hadoop daemons?
Define data cleansing?
What is namenode?
Explain what is webdav in hadoop?
What is purpose of RecordWriter in Hadoop?
Who are ‘Data Scientists’?
Compare Apache Hadoop and Apache Spark?
What is the default replication factor and how will you change it?
Give me the examples of Columnar database ?
List Hadoop’s three configuration files?
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