How is the distance between two nodes defined in Hadoop?
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What is difference between secondary namenode, checkpoint namenode & backupnod secondary namenode, a poorly named component of hadoop?
What is the default replication factor?
How does a namenode handle the failure of the data nodes?
Where is the Mapper Output stored?
What is HDFS block size and what did you chose in your project?
Is client the end user in HDFS?
How to enable/configure the compression of map output data in hadoop?
What are the main components of a Hadoop Application?
What is a Combiner?
What is IdentityMapper?
Define tasktracker.
Name some companies that use Hadoop?