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Hadoop Interview Questions
Questions Answers Views Company eMail

What is MapReduce?

 1 1114

What MapReduce framework consists of?

 763

Can we submit the mapreduce job from slave node?

 840

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

 638

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

 986

What is Reduce only jobs?

 1 961

What is a IdentityMapper and IdentityReducer in MapReduce ?

 634

Explain Working of MapReduce?

 660

Write a Mapreduce Program for Character Count ?

 703

how to proceed to write your first mapreducer program?

 1025

How to set the number of reducers?

 1030

Developing a MapReduce Application?

 652

Different ways of debugging a job in MapReduce?

 799

Explain the Reducer's reduce phase?

 701

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

 1 2105

Un-Answered Questions { Hadoop }

What do you mean by the high availability of a namenode?

15

Why is block size set to 128 MB in Hadoop HDFS?

36

If you run hive as a server, what are the available mechanism for connecting it from application?

581

What are the areas where ambari helps the system administrators to do?

65

If a particular file is 50 mb, will the hdfs block still consume 64 mb as the default size?

18




Can we use windows for hadoop?

232

How does impala achieve its performance improvements?

33

How does pipe operation writes the result to standard output in Apache Spark?

208

How will you make changes to the default configuration files?

560

What are the problems with Hadoop 1.0?

768

Is spark secure?

186

What is executor cores in spark?

203

What is rdd map?

205

What is streaming?

381

What operations does rdd support?

187

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