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

Apache Hadoop (394)
MapReduce (354)
Apache Hive (345)
Apache Pig (225)

Apache Ambari (93)
Apache HCatalog (34)
Apache HDFS Hadoop Distributed File System (214)
Apache Kafka (189)

Hadoop Interview Questions

Questions Answers Views Company eMail

Define data integrity? How does hdfs ensure data integrity of data blocks stored in hdfs?

What is a rack awareness algorithm and why is it used in hadoop?

What is a block?

What is throughput? How does hdfs provides good throughput?

Replication causes data redundancy and consume a lot of space, then why is it pursued in hdfs?

Define hadoop archives? What is the command for archiving a group of files in hdfs.

What do you mean by the high availability of a namenode?

What is the difference between nas (network attached storage) and hdfs?

What is a rack awareness algorithm?

What is the problem in having lots of small files in hdfs?

Why rack awareness algorithm is used in hadoop?

Can you change the block size of hdfs files?

What is an identity mapper and identity reducer?

664

What are the advantages of using mapreduce with hadoop?

637

What do you know about nlineinputformat?

740

Un-Answered Questions { Hadoop }

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

749

Which command is used to SHOW PARTITIONS lists in HCatalog?

What do you mean by replication factor?

What is a keyspace in Cassandra?

107

What are the difference between of the “HDFS Block” and “Input Split”?

Explain what does the conf.setmapper class do?

666

What is off heap memory in spark?

326

What is hive on spark?

403

How is spark fault tolerance?

406

If there is certain data that we want to use again and again in different transformations, what should improve the performance?

322

How one can change Replication factor when Data is already stored in HDFS

What is Hive Database?

745

Why are spark transformations lazy?

310

What is the difference between rdbms and hadoop?

679

Can you explain how do ‘map’ and ‘reduce’ work?

778

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