[jira] [Commented] (AMBARI-17241) Services should be able to reload configs without requiring restart

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

    [ https://issues.apache.org/jira/browse/AMBARI-17241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15360364#comment-15360364 ] 

Matt commented on AMBARI-17241:
-------------------------------

Thanks for your suggestions [~tctruong213]

From your suggestion I infer that you would only show a button to the user saying 'Apply Configuration Changes'.
(i) if all configs that were changed does not require restart ... show no warning, apply changes
(ii) if configs that were changed contains configs requiring restart and configs not requiring restart ... show warning, restart service
(iii) if all configs that were changed requires restart ... show warning, restart service

Please confirm if my understanding described above is correct. It would need only some minor UI changes to the prototype I presented, to make it work that way.



Just putting my thoughts on scenario (ii) above, where user changes some configs, which need restart and some which don't.
Would there be a situation where user wants to apply the configurations, which do not require restart, immediately, without affecting running jobs? And later restart the service to apply other configs which were not applied before, after the running jobs have been completed?
This action would apply the configs 'partially' - apply changes which do not require restart first. From implementation perspective, this would be challenging to implement - tracking if each config was applied or not is more complex. Any thoughts on this [~tctruong213] whether users/customers require this partial way of applying configs? This can also be an enhancement for this JIRA, if required.

> Services should be able to reload configs without requiring restart
> -------------------------------------------------------------------
>
>                 Key: AMBARI-17241
>                 URL: https://issues.apache.org/jira/browse/AMBARI-17241
>             Project: Ambari
>          Issue Type: New Feature
>            Reporter: Matt
>            Assignee: Matt
>            Priority: Minor
>             Fix For: trunk
>
>         Attachments: AMBARI-17241-Design-Proposal.pdf
>
>
> The current implementation forces users to restart the service if any of the configurations have been updated. 
> However some of the services support reloading the configuration parameters during run-time which does not require restart of the service.
> This behavior should be driven by metadata defined in configuration files.
> {code}
>   <property>
>     <name>foo-bar</name>
>     <value>0</value>
>     <supports-reload>true</supports-reload>
>   </property>
> {code}



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