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Big Data Interview Questions
Questions Answers Views Company eMail

What is a IdentityMapper and IdentityReducer in MapReduce ?

 643

Explain Working of MapReduce?

 667

Write a Mapreduce Program for Character Count ?

 713

how to proceed to write your first mapreducer program?

 1031

How to set the number of reducers?

 1040

Developing a MapReduce Application?

 660

Different ways of debugging a job in MapReduce?

 807

Explain the Reducer's reduce phase?

 711

Why do we use HDFS for applications having large data sets and not when there are lot of small files?

 1 2137

What are the functions of NameNode?

 1 1413

How to configure hadoop to reuse JVM for mappers?

 793

mapper or reducer?

 633

How to resolve IOException: Cannot create directory

 679

Does Pig support multi-line commands?

 573

How to change replication factor of files already stored in HDFS?

 713

Un-Answered Questions { Big Data }

Explain Spark streaming?

189

Explain bucketing in Hive?

501

What is the role of Consumer API?

304

What are the advantages and Disadvantages in archieving partition in Hive?

459

When to use secondary indexes?

50




What are clusters in cassandra?

42

Why aggregation cannot be done in Mapper?

304

Is spark good for machine learning?

207

Explain what is speculative execution?

219

Please explain the sparse vector in Spark.

211

is it posible to join multiple fields in pig scripts?

314

Why HDFS stores data using commodity hardware despite the higher chance of failures?

21

Explain the common input formats in hadoop?

240

What are sink processors?

645

Explain jsonloader, jsonstorage functions in pig?

323

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