Mapreduce Interview Questions and answers


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 […]


Hadoop Interview Questions and Answers Part – 5 1

Below are some of the hadoop interview questions and answers. 1. As the data is replicated thrice in HDFS, does it mean that any calculation done on one node will also be replicated on the other two? Since there are 3 nodes, when we send the MapReduce programs, calculations will be done only on the original data. The master node will know which node exactly has that particular data. In […]


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 […]


Hadoop Interview Questions and Answers Part – 4

Below are a few more hadoop interview questions and answers for freshers and experienced hadoop developers. Hadoop Interview questions and answers 1.  What is the default block size in HDFS ? As of Hadoop-2.4.0 release, the default block size in HDFS is 256 MB and prior to that it was 128 MB. 2.  What is the benefit of large block size in HDFS ? Main benefit of large block size […]


Hadoop Interview Questions and Answers Part – 3 2

Below are a few more hadoop interview questions and answers for both freshers and experienced hadoop developers and administrators. Hadoop Interview questions and answers 1.  What is a Backup Node? It is an extended checkpoint node that performs checkpointing and also supports online streaming of file system edits. It maintains an in memory, up-to-date copy of file system namespace and accepts a real time online stream of file system edits […]


Hadoop Interview Questions and Answers Part – 2

Below are a few more Hadoop Interview Questions and Answers. Please refer previous posts on this topic for additional questions on HDFS. Hadoop Interview Questions and Answers 1.  What is HDFS ?  HDFS is a distributed file system implemented on Hadoop’s framework. It is a block-structured distributed file system designed to store vast amount of data on low cost commodity hardware and ensuring high speed process on data. HDFS stores […]


Hadoop Interview Questions Part – 1 1

Below are a few hadoop interview questions for both hadoop developers and administrators. Hadoop Interview Questions and Answers 1.  What is Big Data ? Big data is vast amount of data (generally in GBs or TBs of size) that exceeds the regular processing capacity of the traditional computing servers and requires special parallel processing mechanism. This data is too big and its rate of increase gets accelerated. This data can be either […]


50 Mapreduce Interview Questions and Answers Part – 1 10

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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