Installing an Earlier CDH4 Release
Follow these instructions to install a release earlier than the current CDH release.
A common reason for doing this would be that you need to add new nodes to an existing cluster that is not running the most recent version of CDH. For example your cluster might be running CDH4.0.1 when the most recent release is CDH4.1.2; in this case, you will want to install CDH4.0.1 on the new nodes, not CDH4.1.2.
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