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

Apache Hadoop Interview Questions

Questions Answers Views Company eMail

What is the difference between Hadoop and Traditional RDBMS?

923

What is Partioner in hadoop? Where does it run

975

Does Hadoop requires RAID?

945

What is the purpose of DataNode block scanner?

966

What is a checkpoint?

967

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

1222

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

1734

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

1172

What is the problem with HDFS and streaming data like logs

1022

What is the Use of SSH in Hadoop ?

959

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

1005

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

1076

What is Schema on Read and Schema on Write?

916

What is the difference between traditional RDBMS and Hadoop?

1171

What is the main purpose of HDFS fsck command?

1792

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Un-Answered Questions { Apache Hadoop }

Does the hdfs client decide the input split or namenode?

668

what is the default replication factor in HDFS?

1017

What are channel selectors?

1029

How many instances of tasktracker run on a hadoop cluster?

679

Define a daemon?

668

On which port does ssh work?

738

What is the difference between hadoop and other data processing tools?

688

What are the steps to submit a Hadoop job?

906

Main Components of Hadoop?

769

What is the full form of fsck?

702

What does ‘jps’ command do?

695

How to restart Namenode?

747

On what basis name node distribute blocks across the data nodes?

1060

What is HDFS Federation?

983

How many JVMs run on a slave node?

1044

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