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?

719

How can I restart namenode?

758

What do masters consist of?

722

What if a namenode has no data?

705

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

708

What is formatting of the dfs?

861

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

775

Does this lead to security issues?

772

How to change from su to cloudera?

767

Why password is needed in ssh localhost?

848

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

788

What does the command mapred.job.tracker do?

823

How to come out of the insert mode?

834

What is the full form of fsck?

740

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

755

Un-Answered Questions { Hadoop }

How would you tackle counting words in several text documents?

1060

What are components of Cassandra Data Model?

How is Pig Useful For?

668

What is full form of rdd?

402

What do you mean by meta data in hdfs? List the files associated with metadata.

Mention key components of Hive Architecture?

893

What is the difference betwaeen mapreduce engine and hdfs cluster?

What is the difference between cassandra's schema and rdbms schema?

How is hadoop different from spark?

284

How hive can improve performance with orc format tables?

771

How can you avoid importing tables one-by-one when importing a large number of tables from a database?

What is the key- value pair in MapReduce?

838

What are the fundamental configurations parameters specified in map reduce?

674

What do you mean by commit log in Cassandra?

What are clusters in cassandra?

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