[jira] [Created] (AMBARI-14891) RU/EU should only delete configs on downgrade if source stack matches stack whose status is CURRENT

["Alejandro Fernandez (JIRA)" <ji...@apache.org>]

Alejandro Fernandez created AMBARI-14891:
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             Summary: RU/EU should only delete configs on downgrade if source stack matches stack whose status is CURRENT
                 Key: AMBARI-14891
                 URL: https://issues.apache.org/jira/browse/AMBARI-14891
             Project: Ambari
          Issue Type: Bug
          Components: ambari-server
    Affects Versions: 2.1.2
            Reporter: Alejandro Fernandez
            Assignee: Alejandro Fernandez
             Fix For: 2.2.2


Saw a case with a customer in which they did the following.
* Ambari 2.1.2
* Rolling Upgrade from HDP 2.2 to 2.3.0.0 and skipped the Finalize step, so Ambari never called "Save DB State". Hence, the current stack version was still 2.2. They then modified the host_version and cluster_version records in the DB to mark HDP 2.3 as CURRENT.
* Forgot to call ambari-server set-current-version
* Registered and installed bits for HDP 2.3.4.0 and began another RU. After running into an issue, they decided to downgrade, which then completely removed the configs for the target stack (which is HDP 2.3!)

In order to prevent deleting configs in cases where the user has modified the database, add stronger validation to FinalizeUpgradeAction so that we check that the request's source target stack equals the stack of the repo marked as CURRENT. In this case, they were 2.2 and 2.3, respectively.




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