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https://issues.apache.org/jira/browse/AMBARI-18167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15423391#comment-15423391
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Jayush Luniya commented on AMBARI-18167:
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+1 for the patch. The Hadoop QA failure is not related.
> RU: Kafka brokers restart was stopped during downgrade cluster
> --------------------------------------------------------------
>
> Key: AMBARI-18167
> URL: https://issues.apache.org/jira/browse/AMBARI-18167
> Project: Ambari
> Issue Type: Bug
> Components: ambari-server
> Affects Versions: 2.4.0
> Reporter: Mugdha Varadkar
> Assignee: Mugdha Varadkar
> Priority: Blocker
> Labels: 240RMApproved
> Fix For: 2.4.0
>
> Attachments: AMBARI-18167.patch
>
>
> Kafka broker restart failed due to below error:
> {noformat}
> 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!
> {noformat}
> Solution:
> During RU downgrade, <pre-upgrade/> runs on downgrade as well, which deleted
> {{xasecure.audit.destination.db}} config property.
> {noformat}
> <pre-upgrade>
> <task xsi:type="configure"
> id="hdp_2_5_0_0_remove_ranger_kafka_audit_db" />
> </pre-upgrade>
> {noformat}
> Need to override it with a blank <pre-downgrade/> element.
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