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

Big Data Interview Questions

Questions Answers Views Company eMail

What is the job tracker role in hadoop?

426

Explain how do you overwrite replication factor?

438

Explain how can we check whether namenode is working or not?

570

Define a udf?

423

Define a sequence file in hadoop?

543

Name the operating system(s) which are supported for production hadoop deployment?

437

Explain in which directory hadoop is installed?

470

List of the some best tools that can be useful for data-analysis?

439

Explain the difference between an inputsplit and a block?

434

What is the use of cloudera?

448

Explain about the indexing process in hdfs?

Explain what is difference between an input split and hdfs block?

Replication causes data redundancy then why is pursued in hdfs?

Since the data is replicated thrice in hdfs, does it mean that any calculation done on one node will also be replicated on the other two?

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

Un-Answered Questions { Big Data }

What are spark jobs?

300

What is indexing and why do we need it?

825

What are the differences between Caching and Persistence method in Apache Spark?

313

when do reducers play their role in a mapreduce task?

617

What is the difference between RDBMS with Hadoop MapReduce?

799

How do I optimize my spark code?

306

What are the possible Job roles?

On what basis data will be stored on a rack?

1143

Can you give a detailed overview about the Big Data being generated by Facebook?

433

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

450

What are the benefits of lazy evaluation?

303

What is a parquet file?

284

How to specify more than one path for storage in Hadoop?

508

What do masters consist of?

695

According to IBM, what are the three characteristics of Big Data?

436

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