Define a udf?
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what is next step after mapper or maptask?
What are configuration files in Hadoop?
What happen if one of the datanodes has much slower cpu?
Explain what happens when hadoop spawned 50 tasks for a job and one of the task failed?
Clarify what webdav is in hadoop?
What is a record reader?
Clarify what jobtracker is in hadoop? What are the activities followed by hadoop?
Doesn’t google have its very own version of dfs?
What is a Heartbeat in Hadoop?
What are 'slaves' and 'masters' in Hadoop?
What is a udf?
Can you explain bloommapfile.
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