This is the documentation for CDH 5.1.x. Documentation for other versions is available at Cloudera Documentation.
Before You Begin
Note- Before upgrading, be sure to read about the latest Incompatible Changes and Known Issues and Workarounds in CDH 5 in the CDH 5 Release Notes.
- If you are upgrading a cluster that is part of a production system, be sure to plan ahead. As with any operational work, be sure to reserve a maintenance window with enough extra time allotted in case of complications. The Hadoop upgrade process is well understood, but it is best to be cautious. For production clusters, Cloudera recommends allocating up to a full day maintenance window to perform the upgrade, depending on the number of hosts, the amount of experience you have with Hadoop and Linux, and the particular hardware you are using.
- The instructions in this section assume you are upgrading a multi-node cluster. If you are running a pseudo-distributed (single-machine) cluster, Cloudera recommends that you copy your data off the cluster, remove the old CDH release, install Hadoop from CDH 5, and then restore your data.
- If you have a multi-node cluster running an earlier version of CDH 5, use the instructions in one of the following sections to upgrade your cluster to the latest version:
| << Upgrading from an Earlier CDH 5 Release to the Latest Release | Upgrading from a CDH 5 Beta Release to the Latest Version >> | |