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

Big Data Interview Questions

Questions Answers Views Company eMail

How to add/delete a Node to the existing cluster?

524

What is Mapper in Hadoop?

555

What is Reducer in Hadoop?

549

What are the most common InputFormats in Hadoop?

591

Explain InputSplit in Hadoop?

460

What is the purpose of RecordReader in hadoop?

482

What is Combiner in Hadoop?

534

If no custom partitioner is defined in Hadoop then how is data partitioned before it is sent to the reducer?

451

Why aggregation cannot be done in Mapper?

560

Explain map-only job?

524

What is KeyValueTextInputFormat in Hadoop?

529

What happen if number of reducer is set to 0 in Hadoop?

493

What is TextInputFormat in Hadoop?

516

What is purpose of RecordWriter in Hadoop?

509

What are the most common OutputFormat in Hadoop?

549

Un-Answered Questions { Big Data }

What kind of data warehouse application is suitable for Hive? What are the types of tables in Hive?

724

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?

711

Elaborate on Identifiers?

121

How to add/delete a Node to the existing cluster?

524

What is the procedure for namenode recovery?

454

What is speculative execution in Hadoop?

1051

What is the difference between hadoop and other data processing tools?

686

List out the some common problems faced by data analyst?

410

Did you ever ran into a lop sided job that resulted in out of memory error, if yes then how did you handled it ?

440

How to keep files in HDFS?

Explain sortbykey() operation?

292

What are input format, input split & record reader and what they do?

623

What are the functionalities of jobtracer?

408

What is sqoop and flume?

What are the main configuration parameters in a MapReduce program?

635

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