The Java API offers possibility to submit multiple Hadoop job in one source file. A job can be submitted either using
Improve the sorting exercise to handle nonuniform keys distribution. As in the Perl solution, run two Hadoop jobs (using one Java source file) – first samples the input and creates separator, second does the real sorting.
Implement the K-means clustering exercise in Java. Instead of an controlling script, use the Java class itself to execute the Hadoop job as many times as necessary.
Step 26: Compression and job configuration. | Overview | Step 28: Custom data types. |