Code & Cluster

HBase is a NoSQL database from the hadoop family. The NoSql concept is discussed in my blog at What is NoSql ? HBase is a column oriente...

Sorting is a core strength of the Hadoop MapReduce framework. But by default it sorts only the keys. The values for each key are not sorted...

How do you write a method to convert a generic collection to an Array ? A naive implementation would be: public static <T> T[] con...

Garbage (GC) collection is the process by which the java virtual machine frees up memory by releasing the memory taken up by objects that a...

The classic way of configuring beans in Spring is using XML. But many programmers find switching between XML and java code annoying. Having ...

A synchronized HashMap is a Map returned by calling  synchronizedMap methods of java.util.Collections class. Map syncMap = Collections.sy...

Hadoop 2.x release involves many changes to Hadoop and MapReduce. The centralized JobTracker service is replaced with a ResourceManager tha...