@Alejandro Fernandez We have upgraded from Amabari 1.7 to Ambari 2.1.2 last week and today we have upgraded from HDP 2.2 to HDP 2.3 (manual upgrade). The final goal is from here do a rolling upgrade to HDP 2.3.4. All the upgrade process went fine and all the services are running fine until i issued a ambari-server set-current --cluster-name=*** --version-display-name=HDP-2.3.4.0 and restarted the cluster as it was showing pending upgrade in the stacks and versions page. Every time i start a service I get the following error File "/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/hooks/before-ANY/scripts/shared_initialization.py", line 70, in setup_users create_tez_am_view_acls() File "/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/hooks/before-ANY/scripts/shared_initialization.py", line 94, in create_tez_am_view_acls if not params.tez_am_view_acls.startswith("*"): File "/usr/lib/python2.6/site-packages/resource_management/libraries/script/config_dictionary.py", line 81, in __getattr__ raise Fail("Configuration parameter '" + self.name + "' was not found in configurations dictionary!") resource_management.core.exceptions.Fail: Configuration parameter 'tez.am.view-acls' was not found in configurations dictionary! Error: Error: Unable to run the custom hook script ['/usr/bin/python2.6', '/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/hooks/before-ANY/scripts/hook.py', 'ANY', '/var/lib/ambari-agent/data/command-5003.json', '/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/hooks/before-ANY', '/var/lib/ambari-agent/data/structured-out-5003.json', 'INFO', '/var/lib/ambari-agent/tmp'] I did see a Jira and Fix but we have not encountered this when we upgraded our Dev environment. https://issues.apache.org/jira/browse/AMBARI-13835 Moving to a new version is not that easy in our organization, and am trying to see if there is any work around to fix this issue. Is there a way to do a roll back or do a rolling upgrade to 2.3.4 ? I know this is specific to ambari and am trying to see how to fix this ? I am able to shutdown the services but not able to start any. Thanks for looking into this Prasad ... View more