This is the Sqoop (SQL-to-Hadoop) tool. Sqoop allows easy imports and exports of data sets between databases and HDFS.
Sqoop ships with additional documentation: a user guide and a manual page.
Asciidoc sources for both of these are in src/docs/. Run ant docs to build the documentation. It will be created in build/docs/.
If you got Sqoop in release form, documentation will already be built and available in the docs/ directory.
For more information on compiling see COMPILING.adoc.