Mapreduce Interview Questions and answers


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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? [crayon-5bf34b08aa11b030558286/] The Mapper contains the run() method, which call its own […]

Mapreduce Interview Questions and Answers Part – 4


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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 […]

Hadoop Interview Questions and Answers Part – 5


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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 […]

Mapreduce Interview Questions and Answers for Experienced Part – 3



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 […]

Mapreduce Interview Questions and Answers for Experienced Part – 2


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 […]

Hadoop Interview Questions and Answers Part – 4


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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 […]

Hadoop Interview Questions and Answers Part – 3



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 […]

Hadoop Interview Questions and Answers Part – 2


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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 […]

Hadoop Interview Questions Part – 1


mapreduce interview questions and answers 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 […]

50 Mapreduce Interview Questions and Answers Part – 1