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?

604

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?

715

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?

685

What is a combiner and where you should use it?

663

When should you use sequencefileinputformat?

661

What is the purpose of textinputformat?

704

Un-Answered Questions { Big Data }

What is zeromq?

523

How will you write a custom partitioner for a Hadoop job?

453

How to specify more than one directory as input to the MapReduce Job?

697

Why rack awareness algorithm is used in hadoop?

What is simple strategy?

131

Is nosql follow relational db model?

467

What are the presto applications?

How hive can improve performance with orc format tables?

712

What size is recommended for each node?

214

What is difference between secondary namenode, checkpoint namenode & backupnode?

467

What is apache spark core?

305

Explain about ACID transactions in Hive?

732

What does hdfs mean?

What is apache ambari?

112

Do we need to install scala for spark?

311

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