Explain the core components of hadoop?
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What is unstructured data?
What are different types of filesystem?
How to enable recycle bin in hadoop?
What is HDFS Federation?
What is a secondary namenode?
Rack awareness of Namenode?
What are the important differences between apache and hadoop?
What are the network requirements for using hadoop?
On which port does ssh work?
Why do we use HDFS for applications having large data sets and not when there are lot of small files?
What happens to a namenode, when job tracker is down?
Is secondary namenode a substitute to the namenode?
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