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?

705

Explain the features of pseudo mode?

750

What do shuffling do?

713

Explain the basic difference between traditional rdbms and hadoop?

692

Explain what if rack 2 and datanode fails?

671

Define a job tracker?

739

Explain the features of fully distributed mode?

668

What are the characteristics of hadoop framework?

696

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

681

Explain how is hadoop different from other data processing tools?

763

Define a datanode?

684

Is secondary namenode a substitute to the namenode?

715

What is a secondary namenode?

668

What is unstructured data?

699

Explain the overview of hadoop history breifly?

649

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Un-Answered Questions { Apache Hadoop }

What is output format in hadoop?

723

What hadoop does in safe mode?

694

Whats is distributed cache in hadoop?

706

Can we do online transactions(oltp) using hadoop?

706

What is Hadoop streaming?

1079

What will you do when NameNode is down?

1054

What is the best hardware configuration to run Hadoop?

1663

How did you debug your Hadoop code ?

1407

Are Namenode and job tracker on the same host?

1487

Should we use RAID in Hadoop or not?

1105

Explain how input and output data format of the hadoop framework?

744

What is yarn in hadoop?

708

How to configure hadoop to reuse JVM for mappers?

1229

What Mapper does?

1028

Explain what if rack 2 and datanode fails?

671

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