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https://issues.apache.org/jira/browse/AMBARI-22544?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Myroslav Papirkovskyi resolved AMBARI-22544.
--------------------------------------------
Resolution: Fixed
Pushed to trunk and branch-2.6
> Upgrade from Ambari 2.5.2 to 2.6.0 fails
> ----------------------------------------
>
> Key: AMBARI-22544
> URL: https://issues.apache.org/jira/browse/AMBARI-22544
> Project: Ambari
> Issue Type: Bug
> Components: ambari-server
> Affects Versions: 2.6.1
> Reporter: Myroslav Papirkovskyi
> Assignee: Myroslav Papirkovskyi
> Priority: Blocker
> Fix For: 2.6.1
>
>
> When upgrading from Ambari 2.5.2 to Ambari 2.6.0, we hit this error
> preventing from completing the ambari-server upgrade.
> {noformat}
> 20 Nov 2017 11:39:08,115 ERROR [main] SchemaUpgradeHelper:202 - Upgrade
> failed.
> com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException:
> Cannot delete or update a parent row: a foreign key constraint fails
> (`ambari_01`.`clusters`, CONSTRAINT `FK_clusters_upgrade_id` FOREIGN KEY
> (`upgrade_id`) REFERENCES `upgrade` (`upgrade_id`))
> {noformat}
> To get around this, he had to restore the db backup from 2.5.3 and adjust a
> table in mysql with ‘update clusters set upgrade_id = null’ so a record in
> the ‘upgrades’ table could be removed.
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