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

Apache Hadoop Interview Questions

Questions Answers Views Company eMail

Explain why do we need hadoop?

490

Explain the features of pseudo mode?

526

What do shuffling do?

467

Explain the basic difference between traditional rdbms and hadoop?

484

Explain what if rack 2 and datanode fails?

441

Define a job tracker?

498

Explain the features of fully distributed mode?

438

What are the characteristics of hadoop framework?

473

Explain how can we change the split size if our commodity hardware has less storage space?

471

Explain how is hadoop different from other data processing tools?

528

Define a datanode?

471

Is secondary namenode a substitute to the namenode?

508

What is a secondary namenode?

461

What is unstructured data?

477

Explain the overview of hadoop history breifly?

453

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Un-Answered Questions { Apache Hadoop }

Explain the benefits of block transfer?

627

What is Writable & WritableComparable interface?

750

Is fs.mapr.working.dir a single directory?

502

What is inputsplit in hadoop? Explain.

549

What are the problems with Hadoop 1.0?

866

Which are the two types of 'writes' in HDFS?

1010

What are the hadoop's three configuration files?

490

How can you connect an application

822

when hadoop enter in safe mode?

549

What are the main components of a Hadoop Application?

846

What does ‘jps’ command do?

515

How to come out of the insert mode?

518

Is it possible to provide multiple inputs to hadoop? If yes, explain.

502

Can you give us some more details about ssh communication between masters and the slaves?

525

What is the meaning of speculative execution in Hadoop? Why is it important?

869

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