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Hadoop Engineer was asked...6 November 2013

Decorator pattern

4 Answers

do you remember any other questions asked?

equal() vs hashcode() record reader vs input format

thanks , where hadoop Mapreduce code asked during coding round?

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Mostly about Hadoop technologies HDFS, MapReduce, Hbase, Hive.

2 Answers

Answered almost all questions

Hello, Thank you for your interest in Nisum and taking the time to provide feedback. We take all input very seriously here at Nisum, and would like to take this opportunity to help clarify the situation you've referenced. As we discussed and was conveyed to you, Nisum (like many other firms looking for excellent talent) believes in offering the best offer to a candidate after a thorough technical and behavioral assessment. After our evaluation, we found that there was misalignment in expectations between parties. Your expectations seemed to be based on hearsay about working on the west coast. There was also an apparent mismatch between your current views as a contractor versus joining as a full time employee. Finally, we did not say that "you are eligible for less salary." A formal offer was never extended as we could not meet each other's expectations. We apologize if you believe that the interview process was not as you'd hoped. Again, thank you for your interest in Nisum Technologies! Wishing you the best! Nisum HR Less


Better dont ask

2 Answers

Prepare well for interview. Interviewer knows what they need . Better upgrade your skills. Less

Interviewer should also know how to behave. His attitude towards interview candidates is regressive Less


I was not asked even a single proper technical question. It was more so like an hr round.


print department wise salary using mapreduce, hive, pig, spark. One question with different concepts.

1 Answers

in hive select salary from tablename order by dept in spark scala val sl=sqlContext.sql(select salary from tablename order by dept) Less

Larsen & Toubro

Technical questions related to your technology

1 Answers

I have answer for most of them


Detailed experience in your hadoop background

1 Answers

Explain all your work you did and also then you have to give a very clear logic and your soln on the critical problems that you have solved in your work experience. Less


Describe how you implemented MapReduce jobs Describe what data is generated when you run a MR/Tez job Which file format is best to store files in?

1 Answers

Best file format (at the time) was ORC as it was compressed and not cleartext/flat file. Parquet is also a good option and is now considered standard (this was before Delta). Less

American Express

CAP theorem

1 Answers

n theoretical computer science, the CAP theorem, also named Brewer's theorem after computer scientist Eric Brewer, states that it is impossible for a distributed data store to simultaneously provide more than two out of the following three guarantees: Consistency. Availability. Partition tolerance. Less


Java Based Questions, Explain OOPS Concepts, Interface, Given a CSV text file how would write code to display the Second column Values. Other than java, which programming language you know to write this programme.

1 Answers

The OOPS Concepts and Interface questions are pretty simple to answer. For the CSV file, a quick and dirty solution would be to use a file reader to read the file line by line, split on the comma and print out index 1 of the list resulting from the split. (index starts at 0) Easiest alternative to Java is python, which is pretty much exactly the same method. This is by no means the most efficient implementation Less

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