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From "Robert Levas (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMBARI-21809) Pre-configure services during stack upgrade if Kerberos is enabled to reduce number of core service restarts when services are added
Date Thu, 24 Aug 2017 21:22:00 GMT
Robert Levas created AMBARI-21809:
-------------------------------------

             Summary: Pre-configure services during stack upgrade if Kerberos is enabled to
reduce number of core service restarts when services are added
                 Key: AMBARI-21809
                 URL: https://issues.apache.org/jira/browse/AMBARI-21809
             Project: Ambari
          Issue Type: Task
          Components: ambari-server
    Affects Versions: 2.6.0
            Reporter: Robert Levas
            Assignee: Robert Levas
             Fix For: 2.6.0


Pre-configure (certain) services during a stack upgrade to HDP 2.6, when Kerberos is enabled,
to reduce number of core service restarts when services are added.  

Services to pre-configure include:
* Knox
* Beacon

While upgrading the stack (EU or RU), processing the relevant Kerberos descriptor to find
services marked to be _pre-configured_.  When a tagged service is encountered, process it
if it is not installed. Apply only configuration changes for existing configuration types.
 This will set at least the core-site changes related to proxyuser and auth-to-local rules
properties. By doing this, if a tagged service is later installed, the settings will already
be in place in the existing service configs and thus the existing services will not need to
be restarted. 

Caveats:
* Default values for the uninstalled, tagged, services will be assumed 
* The stack advisor will be used to suggest locations of components - used to build the clusterHostInfo
structure that may be used to derive property values. 

Note: This processing is to occur when upgrading the stack from HDP 2.5 to HDP 2.6.




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