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?

875

What is Partioner in hadoop? Where does it run

925

Does Hadoop requires RAID?

890

What is the purpose of DataNode block scanner?

884

What is a checkpoint?

921

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

1166

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

1688

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

1123

What is the problem with HDFS and streaming data like logs

968

What is the Use of SSH in Hadoop ?

920

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

955

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

1026

What is Schema on Read and Schema on Write?

863

What is the difference between traditional RDBMS and Hadoop?

1127

What is the main purpose of HDFS fsck command?

1717

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Un-Answered Questions { Apache Hadoop }

What do you know about keyvaluetextinputformat?

558

Can Hadoop be compared to NOSQL database like Cassandra?

854

What is IdentityMapper?

935

What are the steps to submit a Hadoop job?

866

Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?

591

Is fs.mapr.working.dir a single directory?

643

How can we look for the namenode in the browser?

671

How can I restart namenode?

664

What is MapFile?

926

Explain what happens in textinformat ?

708

What will be the consideration while we do Hardware Planning for Master in Hadoop architecture?

1028

What is unstructured data?

602

Knox and Hadoop Development Tools?

877

What is oozie in hadoop?

630

Does Hadoop requires RAID?

890

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