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How namenode handles data node failures?
Can you define udf?
What is Distributed Cache in Hadoop?
How to restart NameNode or all the daemons in Hadoop?
What is the best practice to deploy the secondary name node?
Where are hadoop’s configuration files located and list them?
Mention what are the three modes in which hadoop can be run?
Where is hadoop-env.sh file present?
How do you overwrite replication factor?
Do we require two servers for the namenode and the datanodes?
Explain what happens when hadoop spawned 50 tasks for a job and one of the task failed?
How many daemon processes run on a hadoop cluster?
When we send a data to a node, do we allow settling in time, before sending another data to that node?
Which directory does hadoop install to?
What are the important modes of hadoop?
