• hadoop2.2 API

http://hadoop.apache.org/docs/r0.23.9/api/index.html

• junit API

http://junit.org/javadoc/4.10/

• mrunit
• mrunit API

　　　　　　http://mrunit.apache.org/documentation/javadocs/1.0.0/index.html

• • mrunit package-summary

　　　　　　http://mrunit.apache.org/documentation/javadocs/0.9.0-incubating/org/apache/hadoop/mrunit/package-summary.html