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 slaves limited to 4000 in hadoop version 1?

540

What is heartbeat in hadoop?

468

Explain small file problem in hadoop

465

How to create the directory when name node is in safe mode?

608

Why can we not create directory /user/dataflair/inpdata001 when name node is in safe mode?

490

Ideally what should be the block size in hadoop?

500

What happen when namenode enters in safemode in hadoop?

479

What is shuffleing in mapreduce?

702

Does mapreduce programming model provide a way for reducers to communicate with each other? In a mapreduce job can a reducer communicate with another reducer?

727

How would you tackle calculating the number of unique visitors for each hour by mining a huge apache log? You can use post processing on the output of the mapreduce job.

901

Describe what happens to a mapreduce job from submission to output?

729

If reducers do not start before all mappers finish then why does the progress on mapreduce job shows something like map(50%) reduce(10%)? Why reducers progress percentage is displayed when mapper is not finished yet?

766

What are mapreduce new and old apis while writing map reduce program?. Explain how it works

724

Give some points of pig for hadoop ?

588

How does master slave architecture in the hadoop?

884

Un-Answered Questions { Big Data }

What does a 'MapReduce Partitioner' do?

737

How hadoop mapreduce works?

698

What are the different Eval functions available in Pig?

602

What is the difference between DSM and RDD?

316

List out some common problems faced by data analyst?

495

Explain the Methods Of ZooKeeper class?

How much is flume worth?

What is zookeeper in hadoop?

692

how Cassandra writes changed data into commitlog?

105

Explain fold() operation in spark?

323

Define role of veracity in big data?

608

What is namenode?

525

What are the different modes available in Pig?

601

Explain Spark map() transformation?

376

Differentiate between GROUP and COGROUP operators?

680

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