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 is MapReduce?

1 1864

What MapReduce framework consists of?

1100

Can we submit the mapreduce job from slave node?

1110

How can we control particular key should go in a specific reducer?

914

How can you add the arbitrary key-value pairs in your mapper?

1423

What is Reduce only jobs?

1 1707

What is a IdentityMapper and IdentityReducer in MapReduce ?

947

Explain Working of MapReduce?

973

Write a Mapreduce Program for Character Count ?

1055

how to proceed to write your first mapreducer program?

1348

How to set the number of reducers?

1363

Developing a MapReduce Application?

971

Different ways of debugging a job in MapReduce?

1106

Explain the Reducer's reduce phase?

1061

Why do we use HDFS for applications having large data sets and not when there are lot of small files?

1 2777

Un-Answered Questions { Hadoop }

What is an offset?

506

Explain deletion in hbase?

148

How Cassandra stores data?

How Cassandra provide High availability feature?

Is scala required for spark?

305

What do you know about the speculative execution?

461

Explain the differences between a combiner and reducer

662

How data or file is read in HDFS?

What is InputFormat in Hadoop MapReduce?

671

How to submit extra files(jars, static files) for Hadoop MapReduce job during runtime?

636

Does the HDFS go wrong? If so, how?

In mapreduce what is a scarce system resource? Explain?

671

Define the term thrift

134

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

205

How can you compare Hadoop and Spark in terms of ease of use?

289

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