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http://jira.magnolia-cms.com/browse/MAGNOLIA-2697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=22242#action_22242
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Philipp Bärfuss commented on MAGNOLIA-2697:
-------------------------------------------

Partial clustering is crucial in my opinion at least to share date between 
author an public instance(s). Candidates are:
- public users (or users in general)
- comments or any other user generated content you like to see/maintain in the 
author environment

Actually there are two 'similar' issues.

A) none clustered config triggers twice an installation
- this is what is described in the issue
B) clustered config does not trigger installation
- the mgnl-files are not extracted to the second instance: MAGNOLIA-1683

In general I think we cannot solve this for every scenario but for some of the 
modules we might have some effort to do to make them cluster-able. Actually 
those we think will be used in this kind of scenarios.

> Allow for installation on partially clustered instances
> -------------------------------------------------------
>
>                 Key: MAGNOLIA-2697
>                 URL: http://jira.magnolia-cms.com/browse/MAGNOLIA-2697
>             Project: Magnolia
>          Issue Type: Improvement
>          Components: core, updatemechanism
>    Affects Versions: 4.0.1
>            Reporter: Jan Haderka
>            Assignee: Philipp Bärfuss
>
> When creating partially clustered Magnolia instances, installation is 
> cumbersome. In case of clustering "config" workspace only, other then first 
> installed cluser node will assume installation was already done and will 
> therefore not bootstrap content to other workspaces and not extract templates 
> and other files to local FS either. In case of clustering any other 
> workspace, installation will fail as soon as other then first installed node 
> tries to install/bootstrap content into such workspaces (which was already 
> filled while installing first cluster node) since it assumes installation was 
> not yet performed.
> We need to think of mechanism how to configure the clustered instances or to 
> make it easy to discover clustered workspaces and act during installation as 
> appropriate.
> Current workaround is to in first case replicate necessary content for other 
> workspaces and for FS manually and in second case to remove any offending 
> bootstrap files from the module on other then fist cluster node prior to 
> installing such a node.

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