How can we create a hadoop cluster from scratch?
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What is data cleansing?
After increasing the replication level, I still see that data is under replicated. What could be wrong?
What is the purpose of context object?
When and how to create hadoop archive?
What happen on the namenode when a client tries to read a data file?
Define data cleansing?
Why aggregation cannot be done in Mapper?
Mention what is distributed cache in hadoop?
What is fsck?
How can you set an arbitrary number of Reducers to be created for a job in Hadoop?
Explain how can you check whether namenode is working beside using the jps command?
What do you think about the speculative execution?
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