Codes Fusion

It's critical to understand the core components in Hadoop YARN (Yet Another Resource Negotiator) or MapReduce 2.0, and how the component...

In this tutorial I will show some common commands for HDFS operations. If you don't have Hadoop setup in your linux, you can follow Had...

There are so many version of WordCount hadoop example flowing around the web. However, a lot of them are using the older version of hadoop a...

Java NIO (New IO) was introduced in JDK 1.4. While Java IO centralizes around Stream/Reader/Writer and uses decorator pattern as its main de...

Spring uses Jackson JSON from http://jackson.codehaus.org/ to serialize an object for json output. To change the default strategy to seriali...

Since HTTP stateless, in a web application, a typical way to keep an user states across multiple requests is through HttpSession. However, d...

Recently I ran into a problem where Spring would automatically convert comma separated String into String array, and quick search in google,...