What is a udf?
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How to do ‘map’ and ‘reduce’ works?
Is there another way to check whether Namenode is working?
What happens if the number of reducers is 0 in Hadoop?
How namenode handles data node failures?
Clarify how job tracker schedules an assignment?
What is a udf?
Can I set the number of reducers to zero?
What are the most common OutputFormat in Hadoop?
Name the most common input formats defined in hadoop?
If we want to copy 10 blocks from one machine to another, but another machine can copy only 8.5 blocks, can the blocks be broken at the time of replication?
Explain Data Locality in Hadoop?
Do we need to place 2nd and 3rd data in rack 2 only?
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