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From "Christopher Tubbs (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-4690) Observable configurations
Date Wed, 02 Aug 2017 18:29:01 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-4690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16111477#comment-16111477
] 

Christopher Tubbs commented on ACCUMULO-4690:
---------------------------------------------

ObservableConfiguration is an interface for a specific implementation of updating with ZooCache.
I plan on rewriting that implementation as part of ACCUMULO-4050. However, I do like the idea
of having configuration updates dynamically tracked. This feature may be more easily implemented
if we moved to a standard config library for the site file (commons-configuration2, for example).
The larger problem to consider is that some properties are not dynamically reloadable, and
we need to clearly define the dynamic reloading behavior on a per-property basis and communicate
that to users.

> Observable configurations
> -------------------------
>
>                 Key: ACCUMULO-4690
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4690
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 2.0.0
>            Reporter: Ivan Bella
>            Priority: Minor
>
> Currently only the table and namespace configurations are observable (implement ObservableConfiguration).
 In order to appropriately deal with system/site configuration changes one needs to use a
Timer that periodically checks the configuration (see TabletServerResourceManager for example).
 It would be nice if we create an observable mechanism for those changes as well.



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