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

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?

614

What are the advantages of using mapreduce with hadoop?

591

What do you know about nlineinputformat?

689

Un-Answered Questions { Hadoop }

What is anti-entropy?

There seem to be certain management tools in Cassandra. What are they?

122

What is the best way to copy files between HDFS clusters?

668

Explain what is logging in Cassandra?

How much Metadata will be created on NameNode in Hadoop?

What according to you is a common mistake apache spark developers make when using spark ?

275

What do you understand by Commit log in Cassandra?

How Pig differs from MapReduce?

808

Explain in which directory hadoop is installed?

477

What do you mean by logging in cassandra?

What is the function of Cluster.Builder class in Cassandra?

139

Can you explain about the indexing process in hdfs?

Why should I use spark?

305

How Pig programming gets converted into MapReduce jobs?

622

How can you use streams api?

547

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