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From "Robert Levas (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (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, 31 Aug 2017 17:47:00 GMT

     [ https://issues.apache.org/jira/browse/AMBARI-21809?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Levas updated AMBARI-21809:
----------------------------------
    Status: Patch Available  (was: Open)

> 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
>
>         Attachments: AMBARI-21809_branch-2.6_01.patch, AMBARI-21809_trunk_01.patch
>
>
> 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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