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?

660

Explain the features of pseudo mode?

702

What do shuffling do?

671

Explain the basic difference between traditional rdbms and hadoop?

653

Explain what if rack 2 and datanode fails?

636

Define a job tracker?

701

Explain the features of fully distributed mode?

625

What are the characteristics of hadoop framework?

668

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

648

Explain how is hadoop different from other data processing tools?

731

Define a datanode?

646

Is secondary namenode a substitute to the namenode?

684

What is a secondary namenode?

628

What is unstructured data?

667

Explain the overview of hadoop history breifly?

623

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Un-Answered Questions { Apache Hadoop }

How to restart Namenode?

747

Define a metadata?

652

What is a spill factor with respect to the ram?

865

when hadoop enter in safe mode?

744

How to change Replication Factor For below cases ?

1085

How to change replication factor of files already stored in HDFS?

1003

what is a datanode?

923

In which location Name Node stores its Metadata and why?

1393

Where is the Mapper Output intermediate kay-value data stored ?

1354

Can hbase run without hadoop?

743

What are the core components of Apache Hadoop?

784

What is column families? What happens if you alter the block size of ColumnFamily on an already populated database?

1105

What if rack 2 and datanode fails?

1060

Whats is distributed cache in hadoop?

678

what are the nodes in the Hadoop cluster?

1045

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