— No in-place upgrade to CDH 5 Beta 2 from CDH 4
Cloudera strongly recommends that you install Cloudera Enterprise 5.0 Beta 2 and CDH 5 Beta 2 on test clusters or new clusters only. In the case of existing clusters, Cloudera fully supports upgrade from Cloudera Enterprise 4.x and CDH 4.x to Cloudera Enterprise 5.0 Beta 2 and CDH 5 Beta 2. Upgrade requires uninstalling the CDH 4 packages before installing CDH 5 packages. See the CDH 5 upgrade documentation for instructions.
— No upgrade directly from CDH 3 to CDH 5
You must upgrade to CDH 4, then to CDH 5. See the CDH 4 documentation for instructions on upgrading from CDH 3 to CDH 4.
—Must build native libraries when installing from tarballs
When installing Hadoop from Cloudera tarballs, you must build your own native libraries. The tarballs do not include libraries that are built for the different distributions and architectures.