Access Database using Hadoop MapReduce
1. Overview In this article we are going to explain how to access Database using Hadoop MapReduce. Nowadays, in ETL world, reading the Database and processing millions of records is…
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Java Read & Write files in HDFS Example
1. Overview In this article, we will discuss I/O operation with HDFS from a java program. Hadoop provides mainly two classes FSDataInputStream for reading a file from HDFS and FSDataOutputStream…
Hadoop Custom Output Format Example
1. Overview Hadoop provides various Output classes like DBOutputFormat, SequenceFileOutputFormat, TextOutputFormat, etc..It also provides flexibility to its developers to use APIs and extend some of the functionality to achieve organization goals….
Hadoop Multiple Outputs Example
1. Overview Sometimes we require that our Hadoop job write data to multiple output locations. Hadoop provides facility to write the output of a job at a different location based on our…