Hadoop General Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Hadoop General Interview Questions

Questions Answers Views Company eMail

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?

527

What is KeyValueTextInputFormat in Hadoop?

529

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

494

What is TextInputFormat in Hadoop?

517

What is purpose of RecordWriter in Hadoop?

509

What are the most common OutputFormat in Hadoop?

550

What is LazyOutputFormat in Hadoop?

496

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Un-Answered Questions { Hadoop General }

How often DataNode send heartbeat to NameNode in Hadoop?

536

Why cloudera is used?

476

What does rack awareness algorithm means and why is it utilized as a part of hadoop?

430

We have already sql then why nosql?

421

In hadoop_pid_dir, what does pid stands for?

524

How often do you need to reformat the namenode?

511

Why Hadoop performs replication, although it results in data redundancy?

1280

What are the important features of hadoop?

442

What a task tracker is in hadoop?

435

List out the different stream grouping in apache storm?

383

What are some typical functions of Job Tracker?

428

Can I set the number of reducers to zero?

397

Why is checkpointing important in hadoop?

468

Clarify what a task tracker is in hadoop?

427

Explain about Hadoop file system and processing framework?

424

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