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https://issues.apache.org/jira/browse/SLING-2523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13402247#comment-13402247
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Carsten Ziegeler commented on SLING-2523:
-----------------------------------------

Currently it doesn't work in the desired way, in some cases you even end up 
with two (or more) calls to the OSGi installer even if there is a single jcr 
observation event.
                
> Improve the JCR Installer
> -------------------------
>
>                 Key: SLING-2523
>                 URL: https://issues.apache.org/jira/browse/SLING-2523
>             Project: Sling
>          Issue Type: Improvement
>          Components: Installer
>    Affects Versions: JCR Installer 3.1.4
>            Reporter: Carsten Ziegeler
>
> The current implementation has some drawbacks: 
> - it registers several observation listeners
> - to handle deletes it has to register even more listeners
> - observation events are just used as markers and there is a polling thread 
> running continously to check for changed markers and then rescan a sub tree 
> in the repository
> - changes are not reported to the OSGi installer in one method call
> I think we can simplify and improve the implementation by
> - just registering a single observation listener for root and then do simple 
> path matching operations
> - use the observation events to detect what has changed
> - report the changes in a single method call
> In addition it would be nice if the jcr installer waits befire reporting 
> changes from an observation event and looks if there is not another 
> observation event coming in "right after". This could improve situations 
> where changes are not done by a single save but by a serious of saves

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