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

What happens to job tracker when namenode is down?

674

How can I restart namenode?

722

What do masters consist of?

694

What if a namenode has no data?

667

Which are the three main hdfs-site.xml properties?

665

What is formatting of the dfs?

829

In cloudera there is already a cluster, but if I want to form a cluster on ubuntu can we do it?

738

Does this lead to security issues?

741

How to change from su to cloudera?

720

Why password is needed in ssh localhost?

804

What happens to a namenode, when job tracker is down?

753

What does the command mapred.job.tracker do?

780

How to come out of the insert mode?

787

What is the full form of fsck?

702

Why do we need a password-less ssh in fully distributed environment?

710

Un-Answered Questions { Hadoop }

Explain HCatLoader and HCatStorer APIs?

how would you modify that solution to only count the number of unique words in all the documents?

974

What is throughput? How does HDFS provide good throughput?

what is Cassandra- CQL collections?

105

How do you run pig scripts on kerberos secured cluster?

545

List the benefits of using Cassandra.

What is the difference between client mode and cluster mode in spark?

320

What are the benefits of apache tajo?

Which interface needs to be implemented to create Mapper and Reducer for the Hadoop?

1214

What is the advantage of hadoop over java serialization?

Write the command to start and stop the spark in an interactive shell?

274

How to Write a UDF function in Hive?

700

Specify Cassandra’s importance on Facebook?

153

What is Hadoop serialization?

698

In which language Cassandra is written?

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