[AMBARI-18167] RU: Kafka brokers restart was stopped during downgrade cluster

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 2.4.0
• Fix Version/s: 2.4.0
• Component/s: ambari-server
• Labels: 240RMApproved
• Assignee: Mugdha Varadkar
• Reporter: Mugdha Varadkar
• Created: 16/Aug/16 18:27
• Updated: 18/Aug/16 23:17
• Resolved: 18/Aug/16 18:14

Description

Kafka broker restart failed due to below error:

raise Fail("Configuration parameter '" + self.name + "' was not found in configurations dictionary!")
resource_management.core.exceptions.Fail: Configuration parameter 'xasecure.audit.destination.db' was not found in configurations dictionary!

Solution:
During RU downgrade, <pre-upgrade/> runs on downgrade as well, which deleted xasecure.audit.destination.db config property.

<pre-upgrade>
          <task xsi:type="configure" id="hdp_2_5_0_0_remove_ranger_kafka_audit_db" />
</pre-upgrade>

Need to override it with a blank <pre-downgrade/> element.