[jira] [Created] (OAK-7739) Use an index only if a certain node or property exists

["Thomas Mueller (JIRA)" <ji...@apache.org>]

Thomas Mueller created OAK-7739:
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             Summary: 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


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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