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https://issues.apache.org/jira/browse/OAK-3403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15333393#comment-15333393
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angela commented on OAK-3403:
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please note that unique indices are a crucial requirement for the default oak
security modules. having only partial support will render the system vulnerable
to most severe security issues!
> Multiplexing store support in Property indexes
> ----------------------------------------------
>
> Key: OAK-3403
> URL: https://issues.apache.org/jira/browse/OAK-3403
> Project: Jackrabbit Oak
> Issue Type: Technical task
> Components: query
> Reporter: Chetan Mehrotra
> Assignee: Chetan Mehrotra
>
> In Oak one can define an index anywhere in the repository under a special
> node name {{oak:index}}. For e.g. if you want a property index for
> {{sling:resourceType}} at root level then you can create the index at
> /oak:index/resourceType and this index would store the index content at
> /oak:index/resourceType/:index.
> # Writing - At time of commit the IndexEditor would need to decide where the
> indexed content for a given path should be stored. To start with it can make
> use of PathToStoreMapper to decide which node to use the indexed content. For
> e.g. for /libs the indexed content is stored under :index-pr and for /content
> :index-sr is used. This is simpler for PropertyIndex where IndexStoreStrategy
> can be passed the right node
> # Reading - At time of reading the QueryIndex implementation would need to
> provide a union cursor which can perform lookup from all such store
> directories for a given index.
> *Open Items*
> # Supporting unique indexes
> # Introducing new oak:index - Node under oak:index node are special.
> Depending on parent path it might be possible that they would have to be
> created in both repositories. For e.g. /oak:index would have to be present in
> both PR and SR. While /content/foo/oak:index can live only in SR.
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