Big Data Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Big Data Interview Questions

Questions Answers Views Company eMail

Why rack awareness algorithm is used in hadoop?

Can you change the block size of hdfs files?

What is an identity mapper and identity reducer?

605

What are the advantages of using mapreduce with hadoop?

590

What do you know about nlineinputformat?

683

Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?

666

What is the role of recordreader in hadoop mapreduce?

734

What happens when the node running the map task fails before the map output has been sent to the reducer?

649

Define speculative execution?

716

Is it legal to set the number of reducer task to zero? Where the output will be stored in this case?

662

What are the advantages of using map side join in mapreduce?

646

What is a map side join?

686

What is a combiner and where you should use it?

663

When should you use sequencefileinputformat?

665

What is the purpose of textinputformat?

704

Un-Answered Questions { Big Data }

What are the relational operators available related to Grouping and joining in Pig language?

482

Explain how can apache spark be used alongside hadoop?

256

What is spark yarn executor memoryoverhead?

370

Do I need scala for spark?

292

Define lzo?

198

Why does spark skip stages?

255

Why slaves limited to 4000 in hadoop version 1?

487

Explain the difference between a MapReduce InputSplit and HDFS block?

658

What do you understand by the partitions in spark?

318

What is pagerank in graphx?

284

What is difference between scala and spark?

319

Mention the common features in Pig and Hive?

917

If a particular file is 50 mb, will the hdfs block still consume 64 mb as the default size?

How to Delete directory and files recursively from HDFS?

Can we have multiple entries in the master files?

694

For More Un-Answered { Big Data } Questions Click Here