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What happens if one hadoop client renames a file or a directory containing this file while another client is still writing into it?
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What are the primary phases of the reducer?
What is the block size in Hadoop?
Is it possible to provide multiple input to Hadoop? If yes then how can you give multiple directories as input to the Hadoop job?
How namenode handles data node failures?
While starting hadoop services, datanode service is not running?
What are the limitations of Hadoop?
Name the operating system(s) which are supported for production hadoop deployment?
Define a record reader?
Is there another way to check whether Namenode is working?
What happen if a datanode loses network connection for a few minutes?
What happen if one of the datanodes has much slower cpu?
Which one is default?
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