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https://issues.apache.org/jira/browse/OAK-7739?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Munteanu reassigned OAK-7739:
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Assignee: Thomas Mueller
> Use an index only if a certain node or property exists
> ------------------------------------------------------
>
> Key: OAK-7739
> URL: https://issues.apache.org/jira/browse/OAK-7739
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: indexing, query
> Reporter: Thomas Mueller
> Assignee: Thomas Mueller
> Priority: Major
> Fix For: 1.10.0, 1.9.9
>
>
> Currently, adding a new index (or reindexing) means the index is used for
> queries as soon as indexing is finished. When using the composite node store
> (in a blue-green deployment), it would be better if there is some control on
> when the index is used for queries. Meaning, the index is used only if a
> certain node or property exists. It is not used if the node or property
> doesn't exist. That allows to control usage as follows:
> * Old (blue) version: node /library/version, property v1 does exist, but v2
> does not.
> * New (green) version: node /library/version, property v1 does not exist, but
> v2 does exist.
> Now a new index can be created which is not used with the old version, but
> used with the new version. The index configuration is as follows:
> {noformat}
> /oak:index/foo_v2/@useIfExists = /library/version/@v2
> {noformat}
> Similary, an index is used only with the old, but not with the new version,
> as follows:
> {noformat}
> /oak:index/foo_v1/@useIfExists = /library/version/@v1
> {noformat}
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