This is the documentation for Cloudera Manager 5.0.x. Documentation for other versions is available at Cloudera Documentation.
Upgrading CDH 5
Use the instructions in this section to upgrade from an earlier version of CDH 5 to the latest version. To upgrade from CDH 4 to CDH 5, use the instructions under Upgrading to CDH 5.
Before You Begin
- Before upgrading, be sure to read about the latest Incompatible Changes and Known Issues and Workarounds in the http://www.cloudera.com/content/cloudera-content/cloudera-docs/CDH5/latest/CDH5-Release-Notes/CDH5-Release-Notes.html.
- Plan downtime. 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.
- To avoid lots of alerts during the upgrade process, you can enable maintenance mode on your cluster before you start the upgrade. This will stop email alerts and SNMP traps from being sent, but will not stop checks and configuration validations from being made. Be sure to exit maintenance mode when you have finished the upgrade in order to re-enable Cloudera Manager alerts.
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