Explain the features of stand alone (local) mode?
What do masters consist of?
What is commodity hardware?
What should be the ideal replication factor in Hadoop Cluster?
What is Writable & WritableComparable interface?
Explain the difference between gen1 and gen2 hadoop with regards to the namenode?
What is rack-aware replica placement policy?
How to restart Namenode?
Input Split & Record Reader and what they do?
Suppose Hadoop spawned 100 tasks for a job and one of the task failed. What will Hadoop do?
How does NameNode tackle DataNode failures?
What are watches?
What is the problem with small files in Apache Hadoop?