[jira] [Commented] (SLING-3747) Provide a way to signal Jcr Installer to pause and resume scanning

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

    [ https://issues.apache.org/jira/browse/SLING-3747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14054841#comment-14054841 ] 

Felix Meschberger commented on SLING-3747:
------------------------------------------

Thanks for providing the patch.

Some remarks:

* runOneCycle should probably also check for the property
* I have the suspicion, that the property event may not always be caught if the {{/system/sling/installer/jcr}} node is removed instead of the property. In fact the listener is also not triggered if the property is removed.

I wonder whether it would be sufficient to just check for the property during runOneCycle and ignore the cycle if the property is set ?

> Provide a way to signal Jcr Installer to pause and resume scanning
> ------------------------------------------------------------------
>
>                 Key: SLING-3747
>                 URL: https://issues.apache.org/jira/browse/SLING-3747
>             Project: Sling
>          Issue Type: New Feature
>          Components: Installer
>            Reporter: Chetan Mehrotra
>         Attachments: SLING-3747.patch
>
>
> Currently Sling Installer JCR Provider would listen for observation event and would perform a rescan every 500 msec upon receiving any observation event. 
> This at times cause issue when large number of bundles get updated in repository say via installation of bug fixing content package. Further if same content package also updates the repository bundle then it causes issues as repository bundle might get updated midway while content package is still being deployed
> Based on [~fmeschbe] suggestion this can be done via introducing a signalling mechanism between component which installs package and JCR Installer. It would work something like this
> # JCR Installer would listen to changes done to property {{/system/sling/installer/jcr/pauseInstallation}}
> # Package installer would set the above flag to true before installing the package and reset it back to false post installation
> # If JCR Installer detects that flag is set to true it would not scan the watch folders untill it get reset back to false
> This should also address the issue in cluster deployment



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