Which operating system(s) are supported for production hadoop deployment?
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What happens if you get a ‘connection refused java exception’ when you type hadoop fsck /?
What happen on the namenode when a client tries to read a data file?
How namenode handles data node failures?
Clarify how ordering in hdfs is finished?
After increasing the replication level, I still see that data is under replicated. What could be wrong?
Can you explain logistic regression?
What is the characteristic of streaming API that makes it flexible run MapReduce jobs in languages like Perl, Ruby, Awk etc.?
Hadoop achieves parallelism by dividing the tasks across many nodes, it is possible for a few slow nodes to rate-limit the rest of the program and slow down the program. What mechanism Hadoop provides to combat this?
Explain edge nodes in hadoop?
Clarify what jobtracker is in hadoop? What are the activities followed by hadoop?
What is Slot in Hadoop v1? Why was it removed from Hadoop v2?
What is a rack?
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