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 […]