Can hadoop replace relational database?
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What happen on the namenode when a client tries to read a data file?
Why aggregation cannot be done in Mapper?
Can you explain rack awareness?
Explain how jobtracker schedules a task?
Why Hadoop performs replication, although it results in data redundancy?
Can you explain hadoop streaming?
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 fsck?
Explain what is hadoop?
What is Reducer in Hadoop?
Is there another way to check whether Namenode is working?
What does block mean?
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