Explain why the name ‘hadoop’?
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Does Hadoop requires RAID?
What is the default replication factor?
Why do we use HDFS for applications having large data sets and not when there are lot of small files?
What is a task instance in hadoop? Where does it run?
Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?
what are the steps involved in decommissioning removing
Explain the hadoop configuration files at present?
What if a namenode has no data?
Can you tell us more about ssh?
Virtual Box & Ubuntu Installation?
What are channel selectors?
How does a namenode handle the failure of the data nodes?
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