[jira] [Closed] (OAK-9301) Automatically pick a merged index

["Andrei Dulceanu (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OAK-9301?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrei Dulceanu closed OAK-9301.
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> Automatically pick a merged index
> ---------------------------------
>
>                 Key: OAK-9301
>                 URL: https://issues.apache.org/jira/browse/OAK-9301
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: indexing, lucene
>            Reporter: Thomas Mueller
>            Assignee: Thomas Mueller
>            Priority: Major
>             Fix For: 1.38.0
>
>
> When using the composite node store for blue-green deployments, multiple versions of a index can exist at the same time, for a short period of time (while both blue and green are running at the same time).
> In OAK-8721 we support automatically pick the latest active index version for this case.
> What we don't support so far is merged indexes. Those are indexes that combine customizations, and changes to the base index.
> The algorithm to decide which version of an index to use should be:
> * If this is a not a composite repository (if it doesn't have non-default mounts), use the index (shortcut).
> * Collect all indexes of the same base name (e.g. damAssetLucene). We can use at most one of them.
> * For the given base name, use the latest version that is active (latest means the highest index version, where xxx-5 < xxx-6 < xxx-6-custom-1 < xxx-6-custom-2 < xxx-7.
> * It's possible that for a given base name, no index is active (in case of app version 1 for a new index).
> An index is active if it has a hidden child node that starts with ":oak:mount-", OR if it is an active merged index. 
> An index is an active merged index if it has the property "merges", and that property points to index definitions, and each of those indexes is either active, disabled, or removed.



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