[jira] [Created] (AMBARI-16954) SERVICE_CHECK Upgrade pre-check does not throw error when its expected to

["Dmitry Lysnichenko (JIRA)" <ji...@apache.org>]

Dmitry Lysnichenko created AMBARI-16954:
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             Summary: SERVICE_CHECK Upgrade pre-check does not throw error when its expected to
                 Key: AMBARI-16954
                 URL: https://issues.apache.org/jira/browse/AMBARI-16954
             Project: Ambari
          Issue Type: Bug
            Reporter: Dmitry Lysnichenko
            Assignee: Dmitry Lysnichenko
         Attachments: AMBARI-16954.patch


*Steps*
# Deploy HDP-2.4.0.0 cluster with Ambari 2.2.2
# Upgrade Ambari to 2.4.0.0
# Register HDP-2.5.0.0 version and install the bits
# Modify configs for some of the service like HDFS, ZK, YARN
# Start EU

*Result*:
EU pre-check does *not* report below error for the three services whose config was modified in step 4
"The following service configurations have been updated and their Service Checks should be run again:"

Upon further investigation found that the pre-check does not work if a service check has never been run for a service at all AND reports success in such cases
In other words, the comparison between last config modification time and last service check time succeeds if service check never ran at all and the output of below query returns empty:
{code}
SELECT start_time FROM host_role_command where role = 'HDFS_SERVICE_CHECK' AND status = 'COMPLETED' ORDER BY start_time DESC;
{code}

In this case when I manually ran a service check for HDFS and retried EU, the pre-check caught the mismatch and reported error

*Note*: I believe we do run service check as part of cluster install, but looks like it does not get updated in the DB tables for all services.




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