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

Apache Hadoop Interview Questions

Questions Answers Views Company eMail

Why do we use HDFS for applications having large data sets and not when there are lot of small files?

1 2842

What are the functions of NameNode?

1 2055

How to configure hadoop to reuse JVM for mappers?

1230

How to resolve IOException: Cannot create directory

1068

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

1035

Which one is default InputFormat in Hadoop ?

1 2405

shouldn't DFS be able to handle large volumes of data already?

1101

what is a datanode?

972

How does NameNode tackle DataNode failures?

1203

What is InputSplit and RecordReader?

1002

What is the purpose of dfsadmin tool?

1292

How can you connect an application

1060

how is a file of the size 1 GB uncompressed

961

Is map like a pointer?

948

What is the default replication factor?

1021

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Un-Answered Questions { Apache Hadoop }

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

751

How will you make changes to the default configuration files?

1009

What is the default block size in hdfs?

1079

What is the problem with small files in Apache Hadoop?

835

What are the problems with Hadoop 1.0?

1092

How a task is scheduled by a jobtracker?

715

What are the site-specific configuration files in Hadoop?

1132

What is the InputFormat ?

1058

Command to format the NameNode?

979

What is Writable & WritableComparable interface?

960

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

746

How to restart Namenode?

795

What is hbase in hadoop?

688

Explain the overview of hadoop history breifly?

651

What does the command mapred.job.tracker do?

821

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