What is a single point of failure in Hadoop 1 and how is it resolved in Hadoop 2?
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What is structured and unstructured data?
Define a udf?
Why use hadoop?
How namenode handles data node failures?
What is heartbeat in hadoop?
Can we use windows for hadoop?
Why aggregation cannot be done in Mapper?
How is security achieved in Hadoop?
Clarify what a task tracker is in hadoop?
What is the default replication factor in Hadoop and how will you change it?
Explain what is webdav in hadoop?
Explain the difference between an inputsplit and a block?
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