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 1921

What MapReduce framework consists of?

1149

Can we submit the mapreduce job from slave node?

1164

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

955

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

1476

What is Reduce only jobs?

1 1775

What is a IdentityMapper and IdentityReducer in MapReduce ?

993

Explain Working of MapReduce?

1030

Write a Mapreduce Program for Character Count ?

1095

how to proceed to write your first mapreducer program?

1415

How to set the number of reducers?

1421

Developing a MapReduce Application?

1020

Different ways of debugging a job in MapReduce?

1149

Explain the Reducer's reduce phase?

1108

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

1 2842

Un-Answered Questions { Hadoop }

What is a Column family in hbase?

200

Mention how many inputsplits is made by a hadoop framework?

613

What is the usage of "cqlsh-version" command?

157

Explain why do we need hadoop?

706

What is rdd map?

338

What is 'Key value pair' in HDFS?

1001

How do I achieve fifo behavior with kafka?

563

Differentiate between FileSink and FileRollSink?

107

Explain apache spark streaming? How is the processing of streaming data achieved in apache spark?

318

Explain sortbykey() operation?

300

How does rdd work in spark?

311

Define Partition in Apache Spark?

326

What main configuration parameters are specified in mapreduce?

718

What is the difference between dataframe and dataset in spark?

304

Explain Drop View Statement along with syntax?

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