[jira] [Created] (AMBARI-12949) Downgrade fails with err: 500 status code received on POST method for API: /api/vi/clusters/mycluster/upgrades

["Di Li (JIRA)" <ji...@apache.org>]

Di Li created AMBARI-12949:
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             Summary: Downgrade fails with err: 500 status code received on POST method for API: /api/vi/clusters/mycluster/upgrades
                 Key: AMBARI-12949
                 URL: https://issues.apache.org/jira/browse/AMBARI-12949
             Project: Ambari
          Issue Type: Bug
          Components: ambari-server
    Affects Versions: 2.1.0
            Reporter: Di Li
            Priority: Critical


I have a 4 node HDP 2.2 cluster where I created a configuration group to apply customized oozie_heap_size to the Oozie server and one of the Oozie client. I was able to rolling upgrade the cluster to HDP 2.3, but when I clicked Downgrade button on the Finalize step. The Ambari UI immediately threw error message "500 status code received on POST method for API: /api/vi/clusters/mycluster/upgrades"

Checking the Ambari server log, it reported a nullpointer error when trying to load the designed configurations
Aug 30, 2015 11:01:07 PM com.sun.jersey.spi.container.ContainerResponse mapMappableContainerException
SEVERE: The RuntimeException could not be mapped to a response, re-throwing to the HTTP container
java.lang.NullPointerException
        at org.apache.ambari.server.state.host.HostImpl.getDesiredHostConfigs(HostImpl.java:1349)

Digging around in the database, I saw that the oozie-env (where I had a configuration group) had no version_tag set with "selected" as 1.
Manually setting the version1 row to have selected = 1, restart server and then I was able to run downgrade.

ambari=> select * from clusterconfigmapping  where type_name = 'oozie-env';
 cluster_id | type_name |     version_tag      | create_timestamp | selected |   user_name
------------+-----------+----------------------+------------------+----------+----------------
          2 | oozie-env | version1             |    1441033897383 |        0 | admin
          2 | oozie-env | version1441037586550 |    1441037586592 |        0 | ambari-upgrade
          2 | oozie-env | version1441039514060 |    1441039516239 |        0 | admin
(3 rows)



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