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 1920

What MapReduce framework consists of?

1143

Can we submit the mapreduce job from slave node?

1160

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?

1473

What is Reduce only jobs?

1 1772

What is a IdentityMapper and IdentityReducer in MapReduce ?

990

Explain Working of MapReduce?

1027

Write a Mapreduce Program for Character Count ?

1095

how to proceed to write your first mapreducer program?

1413

How to set the number of reducers?

1421

Developing a MapReduce Application?

1016

Different ways of debugging a job in MapReduce?

1145

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 2841

Un-Answered Questions { Hadoop }

Explain textFile Vs wholeTextFile in Spark?

440

What is BloomMapFile?

769

Explain the lookup() operation in Spark?

245

Why do we need hadoop for big data analytics?

473

What is a Task instance in Hadoop? Where does it run?1

879

what is SStable consist of?

103

What is apache spark written in?

283

Explain Zero Consistency?

108

What are the different file permissions in the HDFS for files or directory levels?

157

hbase support syntax structure like sql. Yes or no?

204

Is it possible to leverage real time analysis on the big data collected by flume directly? If yes, then explain how?

What is spark application?

380

How to create a user in Hadoop?

524

How to use combiner in hadoop ?

478

How many Reducers should be configured?

192

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