This is the documentation for CDH 4.5.0.
Documentation for other versions is available at Cloudera Documentation.

CDH4 Release Notes

These Release Notes provide information on the new and changed features, incompatible changes, and known and fixed issues for CDH4.5.0:

For links to the detailed change lists that describe the bug fixes and improvements to all of the CDH4 projects, see the packaging section of CDH Version and Packaging Information.

For more information about installing and configuring CDH4, see the CDH4 Installation Guide at:  CDH4 Installation Guide.

To view the Release Notes (or other documentation) for a specific product release, go to Cloudera Documentation, click a product link, and then use the drop-down menu to select a product version.