Hadoop Post Install runs post-install scripts associated with the group of rpms installed or upgraded in the previous step. Once the script has completed successfully (or there is no script), PUT updates the status of the packages for the current group and determines if there are more groups to process. If there are more packages to upgrade, the PUT sequencer returns to the Hadoop Preinstall step to begin upgrading the next group. If a post-upgrade script runs and fails, the failure screen appears where you can choose to retry the script. The problem that caused the script to fail should always be resolved before attempting a retry.
If there are no more groups to upgrade, the Hadoop Post Install step completes and PUT continues to the Finished step.