Monthly Archives: October 2014


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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-5da41ea92fdc7208174794/] 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


avro mr job output 1
In this post, we will discuss about famous word count example through mapreduce and create a sample avro data file in hadoop distributed file system. Prerequisite: In order to execute the mapreduce word count program given in this post, we need avro-mapred-1.7.4-hadoop2.jar file to be present in $HADOOP_HOME/share/hadoop/common/lib directory. This […]

Avro MapReduce Word Count Example