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Apache Hadoop Interview Questions
Questions Answers Views Company eMail

What is the difference between Hadoop and Traditional RDBMS?

 667

What is Partioner in hadoop? Where does it run

 621

Does Hadoop requires RAID?

 649

What is the purpose of DataNode block scanner?

 663

What is a checkpoint?

 663

Did you ever ran into a lop sided job that resulted in out of memory error

 926

What is the communication channel between client and namenode/datanode?

 1416

What is the difference between Gen1 and Gen2 Hadoop with regards to the Namenode?

 901

What is the problem with HDFS and streaming data like logs

 671

What is the Use of SSH in Hadoop ?

 640

What infrastructure do we need to process 100 TB data using Hadoop?

 736

What is the difference between a Hadoop and Relational Database and Nosql?

 706

What is Schema on Read and Schema on Write?

 636

What is the difference between traditional RDBMS and Hadoop?

 793

What is the main purpose of HDFS fsck command?

 1402

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Un-Answered Questions { Apache Hadoop }

What problems can be addressed by using Zookeeper?

679

How is the distance between two nodes defined in Hadoop?

1128

What are the port numbers of namenode, job tracker and task tracker?

435

How is hadoop different from other data processing tools?

399

What are the limitations of importing RDBMS tables into Hcatalog directly?

664




Define a datanode?

385

What is IdentityMapper?

639

Can we do online transactions(oltp) using hadoop?

374

How can one increase replication factor to a desired value in Hadoop?

774

Who is a 'user' in HDFS?

650

How client application interacts with the NameNode?

660

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

710

Explain why do we need hadoop?

381

What is configuration of a typical slave node on Hadoop cluster? How many JVMs run on a slave node?

717

how is a file of the size 1 GB uncompressed

581

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