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

Mention what are the main components of cassandra data model?

Explain what is a cluster in cassandra?

Tell any two features of flume?

116

What will be the result when you do cast(‘abc’ as int)?

775

If you omit the overwrite clause while creating a hive table,what happens to file which are new and files which already exist?

764

How will you convert the string ’51.2’ to a float value in the price column?

895

Can I do transforms or add new functionality?

Why is space not freed up when I issue drop table?

Is avro supported?

Explain what is zookeeper in kafka? Can we use kafka without zookeeper?

541

Mention what is apache kafka?

528

Mention what is the traditional method of message transfer?

583

Mention what is the benefits of apache kafka over the traditional technique?

620

How many distinct layers are of storm’s codebase?

616

Explain how you can improve the throughput of a remote consumer?

559

Un-Answered Questions { Hadoop }

What are all stats classes in the org.apache.pig.tools.pigstats package?

575

What is Flatten?

566

Mention what is the difference between hdfs and nas?

What is wal and hlog in hbase?

307

When to use hadoop, hbase, hive and pig?

543

Who is a 'user' in HDFS?

898

Which method is used to access HFile directly without using HBase?

205

How hive can improve performance with orc format tables?

727

What is graph db? Explain with an example.

Name different types of the data model?

what happens when Hadoop spawned 50 tasks for a job and one of the task failed?

702

How does gossip protocol help in failure detection?

How can you prevent a large job from running for a long time? What do u think is more popular among the developers - Pig or Hive?

669

How does pig work?

606

How is security achieved in Hadoop?

529

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