Can you define udf?
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Web-ui shows that half of the datanodes are in decommissioning mode. What does that mean? Is it safe to remove those nodes from the network?
Explain what is hadoop?
What are the side effects of not running a secondary name node?
What is tasktracker in hadoop?
Can you explain edge nodes in hadoop?
Give me examples of unstructured data?
How jobtracker assign tasks to the tasktracker?
What are the main components of hadoop?
How is the splitting of file invoked in Hadoop ?
What is TaskTracker?
Explain how can you check whether namenode is working beside using the jps command?
What is throughput in Hadoop?
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