Define a udf?
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Why we use intwritable instead of int? Why we use longwritable instead of long?
What are some typical functions of Job Tracker?
Can you explain bloommapfile.
How can you set an arbitrary number of mappers to be created for a job in Hadoop?
What is the best practice to deploy the secondary name node?
What is a record reader?
How often DataNode send heartbeat to NameNode in Hadoop?
How many datanodes can run on a single Hadoop cluster?
What are the differences between hadoop 1 and hadoop 2?
What is Mapper? How can we compress Mapper output in Hadoop?
What is throughput in Hadoop?
How is security achieved in Hadoop?
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