What happen when namenode enters in safemode in hadoop?
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Name the operating system(s) which are supported for production hadoop deployment?
What is a udf?
Explain is it possible to search for files using wildcards?
What is heartbeat in hadoop?
How to do ‘map’ and ‘reduce’ works?
How will you write a custom partitioner for a Hadoop job?
Explain InputSplit in Hadoop?
Why do we need Hadoop Archives? How is it created?
What does rack awareness mean?
What does name-node mean in hadoop?
Which scala library is used for functional programming?
Can you explain record reader?
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