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What is the hadoop-core configuration?
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What is active and passive NameNode in Hadoop?
Define a record reader?
Why we use intwritable instead of int? Why we use longwritable instead of long?
Mention what daemons run on a master node and slave nodes?
What are the benefits yarn brings in to hadoop?
What does secondary name-node means?
Explain how is data partitioned before it is sent to the reducer if no custom partitioner is defined in hadoop?
Are there any special requirements for namenode?
What are the parameters of mappers and reducers?
Name the most common Input Formats defined in Hadoop? Which one is default?
How many job tracker processes can run on a single Hadoop cluster?
Have you ever used counters in hadoop?
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