How will you write a custom partitioner for a Hadoop job?
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What does the high availability of a name-node means? How is it accomplished?
Explain how can we check whether namenode is working or not?
What happens if one hadoop client renames a file or a directory containing this file while another client is still writing into it?
What is the default replication factor in Hadoop and how will you change it?
What is Balancer in Hadoop?
After the Map phase finishes, the Hadoop framework does 'Partitioning, Shuffle and sort'. Explain what happens in this phase?
Can you define a checkpoint?
What is the relationship between Jobs and Tasks in Hadoop?
What are the different modes in which we can configure/install Hadoop?
What is the difference between namenode and datanode in hadoop?
Can you explain edge nodes in hadoop?
What is Mapper in Hadoop?
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