hadoop mapreduce interview questions


Mapreduce Interview Questions and Answers Part – 4 4

In this post, we will discuss about another 50 Mapreduce Interview Questions and Answers for experienced mapreduce developers. Mapreduce Interview Questions and Answers for experienced 1. What are the methods in the Mapper class and order of their invocation?

The Mapper contains the run() method, which call its own setup() method only once, it also call a map() method for each input and finally calls it cleanup() method. We can […]


Mapreduce Interview Questions and Answers for Experienced Part – 3 2

Below are a few more hadoop mapreduce interview questions and answers for experienced and freshers hadoop developers. Hadoop Mapreduce Interview Questions and Answers for Experienced: 1.  After restart of namenode, Mapreduce jobs started failing which worked fine before restart. What could be the wrong ? The cluster could be in a safe mode after the restart of a namenode. The administrator needs to wait for namenode to exit the safe […]


Mapreduce Interview Questions and Answers for Experienced Part – 2

Below are a few more hadoop mapreduce interview questions and answers for experienced and freshers hadoop developers. Hadoop Mapreduce Interview Questions and Answers for Experienced: 1.  What is side data distribution in Mapreduce framework ? The extra read-only data needed by a mapreduce job to process the main data set is called as side data. There are two ways to make side data available to all the map or reduce […]


50 Mapreduce Interview Questions and Answers Part – 1 9

A few of the hadoop Mapreduce Interview questions and answers are presented in this post. These are suitable for both beginners and experienced mapreduce developers. Mapreduce Interview Questions and Answers for Freshers: 1.  What is Mapreduce ? Mapreduce is a framework for processing  big data (huge data sets using a large number of commodity computers). It processes the data in two phases namely Map and Reduce phase. This programming model is […]


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I am a plsql developer. Intrested to move into bigdata.

Neetika Singh ITA

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